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<img src="https://raw.githubusercontent.com/maread99/market_prices/master/docs/media/splash.png"><br>
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-----------------
# market_prices
[](https://pypi.org/project/market-prices/)  [](https://github.com/psf/black)
A python library to create **meaningful** OHLCV datasets for financial instruments.
`market_prices` provides for enhanced querying and post-processing of financial price data.
Works out-the-box with prices from the Yahoo Finance API via [yahooquery][yahooquery] (see [Disclaimers](https://github.com/maread99/market_prices#disclaimers)) or from locally stored .csv files.
## Installation
```bash
$ pip install market-prices
```
## Quickstart
```python
>>> from market_prices import PricesYahoo
>>> prices = PricesYahoo("MSFT") # prices for a single instrument, Microsoft
>>> # OR if Yahoo API endpoints are not all currently available in your region...
>>> prices = PricesYahoo("MSFT", calendars="XNYS", delays=0)
>>> prices.get("5min", minutes=40) # last 40 minutes of prices at 5 minute intervals
```
```
symbol MSFT
open high low close volume
[2022-06-27 15:45:00, 2022-06-27 15:50:00) 264.774994 265.108612 264.320007 264.600006 340111.0
[2022-06-27 15:50:00, 2022-06-27 15:55:00) 264.559998 264.559998 263.279999 263.959991 689347.0
[2022-06-27 15:55:00, 2022-06-27 16:00:00) 263.980011 264.950012 263.880005 264.920013 1042057.0
[2022-06-28 09:30:00, 2022-06-28 09:35:00) 263.980011 266.750000 263.579987 265.989990 1121316.0
[2022-06-28 09:35:00, 2022-06-28 09:40:00) 265.959991 266.910004 265.700012 266.579987 353441.0
[2022-06-28 09:40:00, 2022-06-28 09:45:00) 266.589996 266.869995 264.880005 265.220001 418320.0
[2022-06-28 09:45:00, 2022-06-28 09:50:00) 265.225006 265.350006 263.980011 264.509888 512821.0
[2022-06-28 09:50:00, 2022-06-28 09:55:00) 264.509888 264.509888 264.509888 264.509888 0.0
```
The above call was made 21 minutes after the NYSE open. Notice that the call returns the last 40 **trading minutes** of data, NOT the arbitrary number of trading minutes that may have fallen within the last 40 minutes according to the clock on the wall.
Any interval can be evaluated (limited only by the availability of underlying data).
```python
>>> # prices over a specific session at 68 minute intervals
>>> prices.get("68min", start="2022-06-27", end="2022-06-27", force=True)
```
```
symbol MSFT
open high low close volume
[2022-06-27 09:30:00, 2022-06-27 10:38:00) 267.929993 267.929993 264.829987 266.049988 4988476.0
[2022-06-27 10:38:00, 2022-06-27 11:46:00) 266.070007 267.190002 265.130005 266.144989 2516274.0
[2022-06-27 11:46:00, 2022-06-27 12:54:00) 266.160004 266.230011 264.640015 265.614990 2207186.0
[2022-06-27 12:54:00, 2022-06-27 14:02:00) 265.600006 265.714996 264.329987 264.559998 1777625.0
[2022-06-27 14:02:00, 2022-06-27 15:10:00) 264.570007 265.451599 263.855011 264.269989 1849430.0
[2022-06-27 15:10:00, 2022-06-27 16:00:00) 264.260010 265.108612 263.279999 264.920013 3504532.0
```
NB Here the `force` option forced the right side of the last indice back to the session close.
For daily data...
```python
>>> prices.get("1D", start="2022-02-15", months=3)
```
```
symbol MSFT
open high low close volume
2022-02-15 300.010010 300.799988 297.019989 300.470001 27058300
2022-02-16 298.369995 300.869995 293.679993 299.500000 29982100
2022-02-17 296.359985 296.799988 290.000000 290.730011 32461600
2022-02-18 293.049988 293.859985 286.309998 287.929993 34264000
2022-02-22 285.000000 291.540009 284.500000 287.720001 41736100
... ... ... ... ... ...
2022-05-09 270.059998 272.359985 263.320007 264.579987 47726000
2022-05-10 271.690002 273.750000 265.070007 269.500000 39336400
2022-05-11 265.679993 271.359985 259.299988 260.549988 48975900
2022-05-12 257.690002 259.880005 250.020004 255.350006 51033800
2022-05-13 257.350006 263.040009 255.350006 261.119995 34925100
[62 rows x 5 columns]
```
Above the period has been defined in calendar months ('years' and 'weeks' are also valid arguments).
Daily data can be easily resampled to a higher interval.
```python
>>> prices.get("3D", days=12) # 12 trading days of data at intervals of 3 sessions
```
```
symbol MSFT
open high low close volume
[2022-06-10, 2022-06-15) 260.579987 260.579987 241.509995 244.490005 106210100.0
[2022-06-15, 2022-06-21) 248.309998 255.300003 243.020004 247.649994 109081300.0
[2022-06-21, 2022-06-24) 250.259995 259.369995 249.509995 258.859985 81729600.0
[2022-06-24, 2022-06-29) 261.809998 268.299988 261.720001 264.369995 61089133.0
```
Although some indices are longer than three calendar days, they all comprise of three **trading days** (sessions) of data (all indices are closed on the 'right', such that data includes the session that represents the left side of the interval but NOT any session that might be represented by the right side.). Also, the period the dataset covers is 12 sessions, NOT the arbitrary number of sessions that fell within the last 12 days according to the calendar hanging on the wall.
`market_prices` comes into its own with the creation of datasets comprising instruments that trade on different exchanges.
```python
>>> # Get a prices instance for Microsoft in New York, Alibaba in Hong Kong and 24/7 Bitcoin
>>> prices_mult = PricesYahoo("MSFT, 9988.HK, BTC-USD")
>>> # OR if Yahoo API endpoints are not all currently available in your region...
>>> prices_mult = PricesYahoo(
"MSFT, 9988.HK, BTC-USD", calendars=["XNYS", "XHKG", "24/7"], delays=[0, 15, 0]
)
>>> # lead_symbol determines the exchange against which the period will be evaluated and
>>> # the default output time zone (which for Bitcoin is UTC).
>>> prices_mult.get("90min", hours=9, lead_symbol="BTC-USD")
```
```
symbol MSFT 9988.HK BTC-USD
open high low close volume open high low close volume open high low close volume
[2022-06-28 06:00:00, 2022-06-28 07:30:00) NaN NaN NaN NaN NaN 115.400002 119.099998 115.199997 118.000000 16137193.0 20751.832031 20908.732422 20751.832031 20894.144531 643196928.0
[2022-06-28 07:30:00, 2022-06-28 09:00:00) NaN NaN NaN NaN NaN 118.000000 119.699997 117.099998 118.199997 6600305.0 20885.277344 21070.208984 20846.593750 21070.208984 616460288.0
[2022-06-28 09:00:00, 2022-06-28 10:30:00) NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN 21087.283203 21162.541016 21030.169922 21054.451172 376852480.0
[2022-06-28 10:30:00, 2022-06-28 12:00:00) NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN 21047.083984 21069.363281 20958.353516 20995.970703 249643008.0
[2022-06-28 12:00:00, 2022-06-28 13:30:00) NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN 20996.517578 21089.582031 20913.453125 20993.925781 319698944.0
[2022-06-28 13:30:00, 2022-06-28 15:00:00) 263.980011 266.910004 263.210205 263.529999 3027945.0 NaN NaN NaN NaN NaN 20990.644531 21084.759766 20990.644531 21084.759766 88373248.0
```
By default prices are shown as missing when the exchange is closed (the time zone of the above output is UTC). Indices that would cover periods during which no symbol trades are excluded. (Scroll right on the output to see all the returned data.)
*Within* any session missing prices between the open and the close are always filled with contiguous data. This happens even for illiquid instruments where the price data alone may give no indication of a session's open or close. (See the [exchange_calendars](#exchange_calendars) section for how `market_prices` 'knows' the trading times of each symbol.)
The `get` method has plenty of options to customize the output, including `fill` to fill in indices when an exchange is closed...
```python
>>> # as before, only now filling in prices when exchanges are closed
>>> prices_mult.get("90min", hours=9, lead_symbol="BTC-USD", fill="both")
```
```
symbol MSFT 9988.HK BTC-USD
open high low close volume open high low close volume open high low close volume
[2022-06-28 06:00:00, 2022-06-28 07:30:00) 263.980011 263.980011 263.980011 263.980011 0.0 115.400002 119.099998 115.199997 118.000000 16137193.0 20751.832031 20908.732422 20751.832031 20894.144531 643196928.0
[2022-06-28 07:30:00, 2022-06-28 09:00:00) 263.980011 263.980011 263.980011 263.980011 0.0 118.000000 119.699997 117.099998 118.199997 6600305.0 20885.277344 21070.208984 20846.593750 21070.208984 616460288.0
[2022-06-28 09:00:00, 2022-06-28 10:30:00) 263.980011 263.980011 263.980011 263.980011 0.0 118.199997 118.199997 118.199997 118.199997 0.0 21087.283203 21162.541016 21030.169922 21054.451172 376852480.0
[2022-06-28 10:30:00, 2022-06-28 12:00:00) 263.980011 263.980011 263.980011 263.980011 0.0 118.199997 118.199997 118.199997 118.199997 0.0 21047.083984 21069.363281 20958.353516 20995.970703 249643008.0
[2022-06-28 12:00:00, 2022-06-28 13:30:00) 263.980011 263.980011 263.980011 263.980011 0.0 118.199997 118.199997 118.199997 118.199997 0.0 20996.517578 21089.582031 20913.453125 20993.925781 319698944.0
[2022-06-28 13:30:00, 2022-06-28 15:00:00) 263.980011 266.910004 263.049988 263.148987 3063273.0 118.199997 118.199997 118.199997 118.199997 0.0 20990.644531 21084.759766 20990.644531 21084.759766 88373248.0
```
The 'workback' `anchor` option offers an alternative to anchoring indices on each session's open. The following call requests two trading days of data to a specific minute, at 3 hour intervals, with data evaluated by working back from the last indice.
```python
>>> df = prices.get("3h", end="2022-06-27 15:44", days=2, anchor="workback")
>>> df
```
```
symbol MSFT
open high low close volume
[2022-06-24 10:14:00, 2022-06-24 13:14:00) 265.750000 266.459991 263.410004 264.399994 6864301.0
[2022-06-24 13:14:00, 2022-06-27 09:44:00) 264.390015 267.980011 263.640015 265.160004 10765130.0
[2022-06-27 09:44:00, 2022-06-27 12:44:00) 265.149994 267.190002 264.640015 265.100006 7239582.0
[2022-06-27 12:44:00, 2022-06-27 15:44:00) 265.109985 265.714996 263.760010 264.570007 5237309.0
```
The second indice can be seen to cross sessions. It partly covers the end of a Friday session and partly the start of the subsequent Monday session...
```python
>>> df.index.length
TimedeltaIndex(['0 days 03:00:00', '2 days 20:30:00', '0 days 03:00:00',
'0 days 03:00:00'],
dtype='timedelta64[ns]', freq=None)
```
Although that indice still comprises only the requested interval of 3 trading hours...
```python
>>> calendar = prices.calendar_default
>>> df.pt.indices_trading_minutes(calendar)
```
```
[2022-06-24 10:14:00, 2022-06-24 13:14:00) 180
[2022-06-24 13:14:00, 2022-06-27 09:44:00) 180
[2022-06-27 09:44:00, 2022-06-27 12:44:00) 180
[2022-06-27 12:44:00, 2022-06-27 15:44:00) 180
Name: trading_mins, dtype: int64
```
The `indices_trading_minutes` method called above is available via the `.pt` accessor. (`market_prices` uses the `.pt` accessor to make available a host of properties and methods to directly interrogate the price data.)
Whereas the above examples used the `get` method to create a dataset, the following methods provide for more specific queries.
`close_at` returns the most recent close price as of a specific date.
```python
>>> prices_mult.close_at("2022-06-27")
```
```
symbol MSFT 9988.HK BTC-USD
2022-06-27 264.890015 118.099998 20735.478516
```
`price_at` returns prices as at a specific minute.
```python
>>> prices_mult.price_at("2022-06-27 16:22", tz="MSFT")
```
```
symbol MSFT 9988.HK BTC-USD
2022-06-27 16:22:00-04:00 264.920013 118.099998 20922.904297
```
`price_range` returns OHLCV data over a period defined with the same arguments as `get`.
```python
>>> # ohlcv data for period comprising 3 sessions to a specific time
>>> prices_mult.price_range(end="2022-06-07 15:22", days=3, lead_symbol="MSFT", stack=True)
```
```
open high low close volume
symbol
(2022-06-02 15:22:00, 2022-06-07 15:22:00] 9988.HK 92.800003 101.800003 91.250000 98.800003 1.818390e+08
BTC-USD 30084.296875 31693.291016 29311.683594 30366.656250 6.989303e+10
MSFT 273.535004 274.649994 266.029999 272.149994 5.853911e+07
```
The [quickstart.ipynb](https://github.com/maread99/market_prices/blob/master/docs/tutorials/quickstart.ipynb) tutorial offers a fuller introduction. [Here](https://github.com/maread99/market_prices/blob/master/docs/tutorials_docs.md) you'll find links to all the tutorials which collectively cover all that `market_prices` offers.
## Features include:
* Get price data out-the-box:
* `PricesYahoo` to get live and historic prices from the Yahoo Finance API via [yahooquery][yahooquery] (see [Disclaimers](https://github.com/maread99/market_prices#disclaimers)).
* `PricesCsv` to get price data from locally stored .csv files.
* Include **securities trading on different exchanges** with differing opening hours across different time zones.
* Request the **period** covered by a dataset in terms of either:
* trading time (minutes and hours).
* number of sessions (days).
* calendar time (weeks, months and years).
* Request data at **ANY interval** (pretty much).
* Use properties and functions of the **`pd.DataFrame.pt` accessor** to interrogate and operate directly on price tables.
* **Anchor** indices either:
* on each (sub)session open.
* on the period end and work back (crossing sessions).
* Price tables indexed with a pandas `IntervalIndex` that defines both sides of the time interval covered by each row.
* Respects **breaks** in exchanges that observe separate morning and afternoon subsessions.
* Indices excluded for any periods when no underlying exchange is open.
* Fills **missing prices**, by security, within the bounds of trading hours (zero leakage).
* Optionally fills missing values outside of trading hours (for multiple securities with different opening hours).
* **Efficient data-usage** (only requests data required and only requests any data point once).
* **Data source flexibility** (use any data source by concreting the ABC).
## Tutorials / Documentation
`market_prices` comes with a host of notebook [tutorials](https://github.com/maread99/market_prices/blob/master/docs/tutorials_docs.md#tutorials) that show example usage and explain every aspect of what's on offer. Check out [quickstart.ipynb](https://github.com/maread99/market_prices/blob/master/docs/tutorials/quickstart.ipynb) for a taster.
All tutorials and other documentation are indexed [here](https://github.com/maread99/market_prices/blob/master/docs/tutorials_docs.md).
Each method's own documentation is also pretty comprehensive.
## market_analy
The [market_analy](https://github.com/maread99/market_analy) library uses prices data from `market_prices` to undertake analyses and create interactive bqplot charts. The [demo video](https://vimeo.com/801302973) covers usage of both libraries.
## exchange_calendars
`market_prices` is nothing without [`exchange_calendars`](https://github.com/gerrymanoim/exchange_calendars).
`exchange_calendars` provides `market_prices`:
* Knowledge of underlying exchanges' opening times.
* A wealth of functionality to interrogate exchanges' sessions and trading minutes.
This knowledge and functionality allows `market_prices` to:
* Index prices according to exchanges' opening hours.
* Evaluate periods defined in terms of trading minutes or sessions.
## Data sources
The functionality offered by `market_prices` is not reliant on any particular data source, but it does need one!
The default prices class, `PricesYahoo`, employs the [yahooquery][yahooquery] library to fetch raw price data. A different data source can be used by simply concreting a subclass of the Abstract Base Class [`PricesBase`](https://github.com/maread99/market_prices/blob/master/src/market_prices/prices/base.py) (see the [developer docs](docs/developers/serving_data.md)).
> :information_source: [yahooquery][yahooquery] offers broad pythonic access to the Yahoo API - check it out if you're after other financial data!
### Calendar maintenance
If you come across missing prices or sessions then the first port of call is to check that the associated calendar is accurate - it may need updating.
* If prices are not included for a session, the calendar may be assuming that day is a holiday.
* If prices are included on a day when the exchange was closed, the calendar is probably assuming that day represents a trading session. In this case prices for the non-trading day will have a constant value and a `errors.PricesMissingWarning` will have been raised when the prices were requested.
All calendars are maintained by user-contributions. If you find one that needs updating, PR the required changes over at `exchange_calendars` and it'll filter into `market_prices` on the next `exchange_calendars` release. Links to the workflow to update calendars can be found [here](https://github.com/gerrymanoim/exchange_calendars#frequently-asked-questions).
The [prices tutorial](https://github.com/maread99/market_prices/blob/master/docs/tutorials/prices.ipynb) covers how `market_prices` associates calendars with symbols.
## Release schedule, bugs, development and feedback
The first beta version of `market_prices` was released May 2022.
Whilst the test suite is pretty comprehensive, there will inevitably be bugs. Please do raise an [issue](https://github.com/maread99/market_prices/issues) with any that you come across. Even better, offer a PR! Contributions welcome.
Please use [discussions](https://github.com/maread99/market_prices/discussions) to make any suggestions and offer general feedback.
## Disclaimers
`market_prices` should not be assumed sufficiently reliable to undertake market analysis intended to inform investment decisions. Users should inspect the source code and the test suite of the library and its dependencies in order to make their own assessment of the packages' suitability for their purposes. **`market_prices` is used entirely at the user's own risk.**
### **Yahoo APIs**
The default `PricesYahoo` class requests data from publically available Yahoo APIs via the [yahooquery][yahooquery] package.
**`market_prices` is NOT in any way affiliated, partnered, sponsored or endorsed by Yahoo. Users of the `PricesYahoo` class should make enquiries to satisfy themselves that they are eligible to receive data from _Yahoo APIs_ and are in compliance with the license requirements and Terms of Service under which the _Yahoo APIs_ may be accessed, to include restrictions concerning NO COMMERCIAL USE.**
Users may find the following references useful in this respect. (These references should not be considered to definitively cover all terms and conditions related to the use of _Yahoo APIs_.)
* [Yahoo Developer API Terms of Use](https://legal.yahoo.com/us/en/yahoo/terms/product-atos/apiforydn/index.html)
* [Yahoo Terms of Service](https://legal.yahoo.com/us/en/yahoo/terms/otos/index.html)
* [Yahoo Terms index](https://policies.yahoo.com/us/en/yahoo/terms/index.htm)
Further, it should NOT be assumed that price data returned by the `PricesYahoo` class will accurately reflect data as provided by _Yahoo APIs_. In this respect users should make their own inspection of the source code and test suites of `market_prices` and its dependencies.
## License
[MIT License](https://github.com/maread99/market_prices/blob/master/LICENSE.txt)
[yahooquery]: https://github.com/dpguthrie/yahooquery/
Raw data
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"description": "<!-- DEFINE ALL LINKS AS ABSOLUTE address so that resolve on PyPI page -->\n<div align=\"center\">\n <img src=\"https://raw.githubusercontent.com/maread99/market_prices/master/docs/media/splash.png\"><br>\n</div>\n\n-----------------\n\n# market_prices\n\n[](https://pypi.org/project/market-prices/)  [](https://github.com/psf/black)\n\nA python library to create **meaningful** OHLCV datasets for financial instruments.\n\n`market_prices` provides for enhanced querying and post-processing of financial price data.\n\nWorks out-the-box with prices from the Yahoo Finance API via [yahooquery][yahooquery] (see [Disclaimers](https://github.com/maread99/market_prices#disclaimers)) or from locally stored .csv files.\n\n## Installation\n\n```bash\n$ pip install market-prices\n```\n\n## Quickstart\n\n```python\n>>> from market_prices import PricesYahoo\n>>> prices = PricesYahoo(\"MSFT\") # prices for a single instrument, Microsoft\n>>> # OR if Yahoo API endpoints are not all currently available in your region...\n>>> prices = PricesYahoo(\"MSFT\", calendars=\"XNYS\", delays=0)\n>>> prices.get(\"5min\", minutes=40) # last 40 minutes of prices at 5 minute intervals\n```\n```\nsymbol MSFT\n open high low close volume\n[2022-06-27 15:45:00, 2022-06-27 15:50:00) 264.774994 265.108612 264.320007 264.600006 340111.0\n[2022-06-27 15:50:00, 2022-06-27 15:55:00) 264.559998 264.559998 263.279999 263.959991 689347.0\n[2022-06-27 15:55:00, 2022-06-27 16:00:00) 263.980011 264.950012 263.880005 264.920013 1042057.0\n[2022-06-28 09:30:00, 2022-06-28 09:35:00) 263.980011 266.750000 263.579987 265.989990 1121316.0\n[2022-06-28 09:35:00, 2022-06-28 09:40:00) 265.959991 266.910004 265.700012 266.579987 353441.0\n[2022-06-28 09:40:00, 2022-06-28 09:45:00) 266.589996 266.869995 264.880005 265.220001 418320.0\n[2022-06-28 09:45:00, 2022-06-28 09:50:00) 265.225006 265.350006 263.980011 264.509888 512821.0\n[2022-06-28 09:50:00, 2022-06-28 09:55:00) 264.509888 264.509888 264.509888 264.509888 0.0\n```\nThe above call was made 21 minutes after the NYSE open. Notice that the call returns the last 40 **trading minutes** of data, NOT the arbitrary number of trading minutes that may have fallen within the last 40 minutes according to the clock on the wall.\n\nAny interval can be evaluated (limited only by the availability of underlying data).\n```python\n>>> # prices over a specific session at 68 minute intervals\n>>> prices.get(\"68min\", start=\"2022-06-27\", end=\"2022-06-27\", force=True)\n```\n```\nsymbol MSFT\n open high low close volume\n[2022-06-27 09:30:00, 2022-06-27 10:38:00) 267.929993 267.929993 264.829987 266.049988 4988476.0\n[2022-06-27 10:38:00, 2022-06-27 11:46:00) 266.070007 267.190002 265.130005 266.144989 2516274.0\n[2022-06-27 11:46:00, 2022-06-27 12:54:00) 266.160004 266.230011 264.640015 265.614990 2207186.0\n[2022-06-27 12:54:00, 2022-06-27 14:02:00) 265.600006 265.714996 264.329987 264.559998 1777625.0\n[2022-06-27 14:02:00, 2022-06-27 15:10:00) 264.570007 265.451599 263.855011 264.269989 1849430.0\n[2022-06-27 15:10:00, 2022-06-27 16:00:00) 264.260010 265.108612 263.279999 264.920013 3504532.0\n```\nNB Here the `force` option forced the right side of the last indice back to the session close.\n\nFor daily data...\n```python\n>>> prices.get(\"1D\", start=\"2022-02-15\", months=3) \n```\n```\nsymbol MSFT\n open high low close volume\n2022-02-15 300.010010 300.799988 297.019989 300.470001 27058300\n2022-02-16 298.369995 300.869995 293.679993 299.500000 29982100\n2022-02-17 296.359985 296.799988 290.000000 290.730011 32461600\n2022-02-18 293.049988 293.859985 286.309998 287.929993 34264000\n2022-02-22 285.000000 291.540009 284.500000 287.720001 41736100\n... ... ... ... ... ...\n2022-05-09 270.059998 272.359985 263.320007 264.579987 47726000\n2022-05-10 271.690002 273.750000 265.070007 269.500000 39336400\n2022-05-11 265.679993 271.359985 259.299988 260.549988 48975900\n2022-05-12 257.690002 259.880005 250.020004 255.350006 51033800\n2022-05-13 257.350006 263.040009 255.350006 261.119995 34925100\n\n[62 rows x 5 columns]\n```\nAbove the period has been defined in calendar months ('years' and 'weeks' are also valid arguments).\n\nDaily data can be easily resampled to a higher interval.\n```python\n>>> prices.get(\"3D\", days=12) # 12 trading days of data at intervals of 3 sessions\n```\n```\nsymbol MSFT\n open high low close volume\n[2022-06-10, 2022-06-15) 260.579987 260.579987 241.509995 244.490005 106210100.0\n[2022-06-15, 2022-06-21) 248.309998 255.300003 243.020004 247.649994 109081300.0\n[2022-06-21, 2022-06-24) 250.259995 259.369995 249.509995 258.859985 81729600.0\n[2022-06-24, 2022-06-29) 261.809998 268.299988 261.720001 264.369995 61089133.0\n```\nAlthough some indices are longer than three calendar days, they all comprise of three **trading days** (sessions) of data (all indices are closed on the 'right', such that data includes the session that represents the left side of the interval but NOT any session that might be represented by the right side.). Also, the period the dataset covers is 12 sessions, NOT the arbitrary number of sessions that fell within the last 12 days according to the calendar hanging on the wall.\n\n`market_prices` comes into its own with the creation of datasets comprising instruments that trade on different exchanges.\n```python\n>>> # Get a prices instance for Microsoft in New York, Alibaba in Hong Kong and 24/7 Bitcoin\n>>> prices_mult = PricesYahoo(\"MSFT, 9988.HK, BTC-USD\")\n>>> # OR if Yahoo API endpoints are not all currently available in your region...\n>>> prices_mult = PricesYahoo(\n \"MSFT, 9988.HK, BTC-USD\", calendars=[\"XNYS\", \"XHKG\", \"24/7\"], delays=[0, 15, 0]\n)\n>>> # lead_symbol determines the exchange against which the period will be evaluated and\n>>> # the default output time zone (which for Bitcoin is UTC).\n>>> prices_mult.get(\"90min\", hours=9, lead_symbol=\"BTC-USD\")\n```\n```\nsymbol MSFT 9988.HK BTC-USD\n open high low close volume open high low close volume open high low close volume\n[2022-06-28 06:00:00, 2022-06-28 07:30:00) NaN NaN NaN NaN NaN 115.400002 119.099998 115.199997 118.000000 16137193.0 20751.832031 20908.732422 20751.832031 20894.144531 643196928.0\n[2022-06-28 07:30:00, 2022-06-28 09:00:00) NaN NaN NaN NaN NaN 118.000000 119.699997 117.099998 118.199997 6600305.0 20885.277344 21070.208984 20846.593750 21070.208984 616460288.0\n[2022-06-28 09:00:00, 2022-06-28 10:30:00) NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN 21087.283203 21162.541016 21030.169922 21054.451172 376852480.0\n[2022-06-28 10:30:00, 2022-06-28 12:00:00) NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN 21047.083984 21069.363281 20958.353516 20995.970703 249643008.0\n[2022-06-28 12:00:00, 2022-06-28 13:30:00) NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN 20996.517578 21089.582031 20913.453125 20993.925781 319698944.0\n[2022-06-28 13:30:00, 2022-06-28 15:00:00) 263.980011 266.910004 263.210205 263.529999 3027945.0 NaN NaN NaN NaN NaN 20990.644531 21084.759766 20990.644531 21084.759766 88373248.0\n```\nBy default prices are shown as missing when the exchange is closed (the time zone of the above output is UTC). Indices that would cover periods during which no symbol trades are excluded. (Scroll right on the output to see all the returned data.)\n\n*Within* any session missing prices between the open and the close are always filled with contiguous data. This happens even for illiquid instruments where the price data alone may give no indication of a session's open or close. (See the [exchange_calendars](#exchange_calendars) section for how `market_prices` 'knows' the trading times of each symbol.)\n\nThe `get` method has plenty of options to customize the output, including `fill` to fill in indices when an exchange is closed...\n```python\n>>> # as before, only now filling in prices when exchanges are closed\n>>> prices_mult.get(\"90min\", hours=9, lead_symbol=\"BTC-USD\", fill=\"both\")\n```\n```\nsymbol MSFT 9988.HK BTC-USD\n open high low close volume open high low close volume open high low close volume\n[2022-06-28 06:00:00, 2022-06-28 07:30:00) 263.980011 263.980011 263.980011 263.980011 0.0 115.400002 119.099998 115.199997 118.000000 16137193.0 20751.832031 20908.732422 20751.832031 20894.144531 643196928.0\n[2022-06-28 07:30:00, 2022-06-28 09:00:00) 263.980011 263.980011 263.980011 263.980011 0.0 118.000000 119.699997 117.099998 118.199997 6600305.0 20885.277344 21070.208984 20846.593750 21070.208984 616460288.0\n[2022-06-28 09:00:00, 2022-06-28 10:30:00) 263.980011 263.980011 263.980011 263.980011 0.0 118.199997 118.199997 118.199997 118.199997 0.0 21087.283203 21162.541016 21030.169922 21054.451172 376852480.0\n[2022-06-28 10:30:00, 2022-06-28 12:00:00) 263.980011 263.980011 263.980011 263.980011 0.0 118.199997 118.199997 118.199997 118.199997 0.0 21047.083984 21069.363281 20958.353516 20995.970703 249643008.0\n[2022-06-28 12:00:00, 2022-06-28 13:30:00) 263.980011 263.980011 263.980011 263.980011 0.0 118.199997 118.199997 118.199997 118.199997 0.0 20996.517578 21089.582031 20913.453125 20993.925781 319698944.0\n[2022-06-28 13:30:00, 2022-06-28 15:00:00) 263.980011 266.910004 263.049988 263.148987 3063273.0 118.199997 118.199997 118.199997 118.199997 0.0 20990.644531 21084.759766 20990.644531 21084.759766 88373248.0\n```\nThe 'workback' `anchor` option offers an alternative to anchoring indices on each session's open. The following call requests two trading days of data to a specific minute, at 3 hour intervals, with data evaluated by working back from the last indice.\n```python\n>>> df = prices.get(\"3h\", end=\"2022-06-27 15:44\", days=2, anchor=\"workback\")\n>>> df\n```\n```\nsymbol MSFT\n open high low close volume\n[2022-06-24 10:14:00, 2022-06-24 13:14:00) 265.750000 266.459991 263.410004 264.399994 6864301.0\n[2022-06-24 13:14:00, 2022-06-27 09:44:00) 264.390015 267.980011 263.640015 265.160004 10765130.0\n[2022-06-27 09:44:00, 2022-06-27 12:44:00) 265.149994 267.190002 264.640015 265.100006 7239582.0\n[2022-06-27 12:44:00, 2022-06-27 15:44:00) 265.109985 265.714996 263.760010 264.570007 5237309.0\n```\nThe second indice can be seen to cross sessions. It partly covers the end of a Friday session and partly the start of the subsequent Monday session...\n```python\n>>> df.index.length\nTimedeltaIndex(['0 days 03:00:00', '2 days 20:30:00', '0 days 03:00:00',\n '0 days 03:00:00'],\n dtype='timedelta64[ns]', freq=None)\n```\nAlthough that indice still comprises only the requested interval of 3 trading hours...\n```python\n>>> calendar = prices.calendar_default\n>>> df.pt.indices_trading_minutes(calendar)\n```\n```\n[2022-06-24 10:14:00, 2022-06-24 13:14:00) 180\n[2022-06-24 13:14:00, 2022-06-27 09:44:00) 180\n[2022-06-27 09:44:00, 2022-06-27 12:44:00) 180\n[2022-06-27 12:44:00, 2022-06-27 15:44:00) 180\nName: trading_mins, dtype: int64\n```\nThe `indices_trading_minutes` method called above is available via the `.pt` accessor. (`market_prices` uses the `.pt` accessor to make available a host of properties and methods to directly interrogate the price data.)\n\nWhereas the above examples used the `get` method to create a dataset, the following methods provide for more specific queries.\n\n`close_at` returns the most recent close price as of a specific date.\n```python\n>>> prices_mult.close_at(\"2022-06-27\")\n```\n```\nsymbol MSFT 9988.HK BTC-USD\n2022-06-27 264.890015 118.099998 20735.478516\n```\n`price_at` returns prices as at a specific minute.\n```python\n>>> prices_mult.price_at(\"2022-06-27 16:22\", tz=\"MSFT\")\n```\n```\nsymbol MSFT 9988.HK BTC-USD\n2022-06-27 16:22:00-04:00 264.920013 118.099998 20922.904297\n```\n`price_range` returns OHLCV data over a period defined with the same arguments as `get`.\n```python\n>>> # ohlcv data for period comprising 3 sessions to a specific time\n>>> prices_mult.price_range(end=\"2022-06-07 15:22\", days=3, lead_symbol=\"MSFT\", stack=True)\n```\n```\n open high low close volume\n symbol\n(2022-06-02 15:22:00, 2022-06-07 15:22:00] 9988.HK 92.800003 101.800003 91.250000 98.800003 1.818390e+08\n BTC-USD 30084.296875 31693.291016 29311.683594 30366.656250 6.989303e+10\n MSFT 273.535004 274.649994 266.029999 272.149994 5.853911e+07\n```\nThe [quickstart.ipynb](https://github.com/maread99/market_prices/blob/master/docs/tutorials/quickstart.ipynb) tutorial offers a fuller introduction. [Here](https://github.com/maread99/market_prices/blob/master/docs/tutorials_docs.md) you'll find links to all the tutorials which collectively cover all that `market_prices` offers.\n\n## Features include:\n* Get price data out-the-box:\n * `PricesYahoo` to get live and historic prices from the Yahoo Finance API via [yahooquery][yahooquery] (see [Disclaimers](https://github.com/maread99/market_prices#disclaimers)).\n * `PricesCsv` to get price data from locally stored .csv files.\n* Include **securities trading on different exchanges** with differing opening hours across different time zones.\n* Request the **period** covered by a dataset in terms of either:\n * trading time (minutes and hours).\n * number of sessions (days).\n * calendar time (weeks, months and years).\n* Request data at **ANY interval** (pretty much).\n* Use properties and functions of the **`pd.DataFrame.pt` accessor** to interrogate and operate directly on price tables.\n* **Anchor** indices either:\n * on each (sub)session open.\n * on the period end and work back (crossing sessions).\n* Price tables indexed with a pandas `IntervalIndex` that defines both sides of the time interval covered by each row.\n* Respects **breaks** in exchanges that observe separate morning and afternoon subsessions.\n* Indices excluded for any periods when no underlying exchange is open.\n* Fills **missing prices**, by security, within the bounds of trading hours (zero leakage).\n * Optionally fills missing values outside of trading hours (for multiple securities with different opening hours).\n* **Efficient data-usage** (only requests data required and only requests any data point once).\n* **Data source flexibility** (use any data source by concreting the ABC).\n\n## Tutorials / Documentation\n`market_prices` comes with a host of notebook [tutorials](https://github.com/maread99/market_prices/blob/master/docs/tutorials_docs.md#tutorials) that show example usage and explain every aspect of what's on offer. Check out [quickstart.ipynb](https://github.com/maread99/market_prices/blob/master/docs/tutorials/quickstart.ipynb) for a taster.\n\nAll tutorials and other documentation are indexed [here](https://github.com/maread99/market_prices/blob/master/docs/tutorials_docs.md).\n\nEach method's own documentation is also pretty comprehensive.\n\n## market_analy\nThe [market_analy](https://github.com/maread99/market_analy) library uses prices data from `market_prices` to undertake analyses and create interactive bqplot charts. The [demo video](https://vimeo.com/801302973) covers usage of both libraries.\n\n## exchange_calendars\n`market_prices` is nothing without [`exchange_calendars`](https://github.com/gerrymanoim/exchange_calendars).\n\n`exchange_calendars` provides `market_prices`:\n* Knowledge of underlying exchanges' opening times.\n* A wealth of functionality to interrogate exchanges' sessions and trading minutes.\n\nThis knowledge and functionality allows `market_prices` to:\n* Index prices according to exchanges' opening hours.\n* Evaluate periods defined in terms of trading minutes or sessions.\n\n## Data sources\nThe functionality offered by `market_prices` is not reliant on any particular data source, but it does need one!\n\nThe default prices class, `PricesYahoo`, employs the [yahooquery][yahooquery] library to fetch raw price data. A different data source can be used by simply concreting a subclass of the Abstract Base Class [`PricesBase`](https://github.com/maread99/market_prices/blob/master/src/market_prices/prices/base.py) (see the [developer docs](docs/developers/serving_data.md)).\n\n> :information_source: [yahooquery][yahooquery] offers broad pythonic access to the Yahoo API - check it out if you're after other financial data!\n\n### Calendar maintenance\nIf you come across missing prices or sessions then the first port of call is to check that the associated calendar is accurate - it may need updating.\n\n* If prices are not included for a session, the calendar may be assuming that day is a holiday.\n* If prices are included on a day when the exchange was closed, the calendar is probably assuming that day represents a trading session. In this case prices for the non-trading day will have a constant value and a `errors.PricesMissingWarning` will have been raised when the prices were requested.\n\nAll calendars are maintained by user-contributions. If you find one that needs updating, PR the required changes over at `exchange_calendars` and it'll filter into `market_prices` on the next `exchange_calendars` release. Links to the workflow to update calendars can be found [here](https://github.com/gerrymanoim/exchange_calendars#frequently-asked-questions).\n\nThe [prices tutorial](https://github.com/maread99/market_prices/blob/master/docs/tutorials/prices.ipynb) covers how `market_prices` associates calendars with symbols.\n\n## Release schedule, bugs, development and feedback\n\nThe first beta version of `market_prices` was released May 2022.\n\nWhilst the test suite is pretty comprehensive, there will inevitably be bugs. Please do raise an [issue](https://github.com/maread99/market_prices/issues) with any that you come across. Even better, offer a PR! Contributions welcome.\n\nPlease use [discussions](https://github.com/maread99/market_prices/discussions) to make any suggestions and offer general feedback.\n\n## Disclaimers\n\n`market_prices` should not be assumed sufficiently reliable to undertake market analysis intended to inform investment decisions. Users should inspect the source code and the test suite of the library and its dependencies in order to make their own assessment of the packages' suitability for their purposes. **`market_prices` is used entirely at the user's own risk.**\n\n### **Yahoo APIs**\n\nThe default `PricesYahoo` class requests data from publically available Yahoo APIs via the [yahooquery][yahooquery] package.\n\n**`market_prices` is NOT in any way affiliated, partnered, sponsored or endorsed by Yahoo. Users of the `PricesYahoo` class should make enquiries to satisfy themselves that they are eligible to receive data from _Yahoo APIs_ and are in compliance with the license requirements and Terms of Service under which the _Yahoo APIs_ may be accessed, to include restrictions concerning NO COMMERCIAL USE.**\n\nUsers may find the following references useful in this respect. (These references should not be considered to definitively cover all terms and conditions related to the use of _Yahoo APIs_.)\n\n* [Yahoo Developer API Terms of Use](https://legal.yahoo.com/us/en/yahoo/terms/product-atos/apiforydn/index.html)\n* [Yahoo Terms of Service](https://legal.yahoo.com/us/en/yahoo/terms/otos/index.html)\n* [Yahoo Terms index](https://policies.yahoo.com/us/en/yahoo/terms/index.htm)\n\nFurther, it should NOT be assumed that price data returned by the `PricesYahoo` class will accurately reflect data as provided by _Yahoo APIs_. In this respect users should make their own inspection of the source code and test suites of `market_prices` and its dependencies.\n\n## License\n\n[MIT License](https://github.com/maread99/market_prices/blob/master/LICENSE.txt)\n\n\n[yahooquery]: https://github.com/dpguthrie/yahooquery/\n",
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