# flake8-multiline-conditionals-comprehensions
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flake8 plugin that works on conditional expressions and comprehension
expressions to enforce each segment to be put on a new line.
## Contents
* [Options](#options)
* [Comprehension Errors](#comprehension-errors)
* [Condition Errors](#condition-errors)
## Options
The flag `--select_mcc2` can be used to select the set of errors
to include. By default, the active errors are MCC200, MCC201, MCC202,
MCC220, MCC221, MCC223.
## Comprehension Errors
### MCC200
A comprehension expression should place each of its generators on a
separate line.
```python
# Bad
[x+y for x in range(10) for y in range(10)]
# Good
[
x + y
for x in range(10)
for y in range(10)
]
```
### MCC201
A multiline comprehension expression should place each of its segments
(map, generator, filter) on a separate line.
```python
# Bad
[x+y for x in range(10)
for y in range(10) if x+y > 5]
# Good
[
x + y
for x in range(10)
for y in range(10)
if x + y > 5
]
```
### MCC202
A comprehension expression should not contain multiple filters.
```python
# Bad
[x for x in range(10) if x % 2 == 0 if x % 3 == 0]
# Good
[x for x in range(10) if x % 2 == x % 3 == 0]
```
### MCC203
A comprehension expression should not span over multiple lines.
```python
# Bad
[x + y
for x in range(10) ]
# Good
[x+y for x in range(10)]
```
### MCC204
A comprehension expression should span over multiple lines.
```python
# Bad
[x for x in range(10)]
# Good
[x
for x in range(10)]
```
## Condition Errors
### MCC220
A multiline conditional expression should place each of its segments
on a separate line.
```python
# Bad
1
if something() else 0
# Good
1
if something()
else 0
```
### MCC221
A conditional expression used for assignment should be surrounded by
parantheses.
```python
# Bad
a = 1 if something() else 0
# Good
a = (1 if something() else 0)
```
### MCC222
A conditional expression should not contain further conditional
expressions.
```python
# Bad
1 if x > 0 else -1 if x < 0 else 0
# Good
if x > 0:
return 1
elif x < 0:
return -1
else:
return 0
```
### MCC223
A conditional expression should not span over multiple lines.
```python
# Bad
1
if something()
else 0
# Good
1 if something() else 0
```
### MCC224
A conditional expression should span over multiple lines.
```python
# Bad
1 if something() else 0
# Good
1
if something()
else 0
```
### MCC225
Conditional expressions should not be used.
Raw data
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"description": "# flake8-multiline-conditionals-comprehensions\n\n[](https://github.com/atollk/flake8-multiline-conditionals-comprehensions/actions)\n[](https://github.com/atollk/flake8-multiline-conditionals-comprehensions/actions)\n[](https://github.com/atollk/flake8-multiline-conditionals-comprehensions/actions)\n[](https://github.com/atollk/flake8-multiline-conditionals-comprehensions/actions)\n\n\nflake8 plugin that works on conditional expressions and comprehension \nexpressions to enforce each segment to be put on a new line.\n\n## Contents\n * [Options](#options)\n * [Comprehension Errors](#comprehension-errors)\n * [Condition Errors](#condition-errors)\n\n## Options\nThe flag `--select_mcc2` can be used to select the set of errors\nto include. By default, the active errors are MCC200, MCC201, MCC202,\nMCC220, MCC221, MCC223.\n\n\n## Comprehension Errors\n\n### MCC200\n\nA comprehension expression should place each of its generators on a \nseparate line.\n\n```python\n# Bad\n[x+y for x in range(10) for y in range(10)]\n\n# Good\n[\n x + y\n for x in range(10)\n for y in range(10)\n]\n```\n\n\n### MCC201\n\nA multiline comprehension expression should place each of its segments\n(map, generator, filter) on a separate line.\n\n```python\n# Bad\n[x+y for x in range(10) \nfor y in range(10) if x+y > 5]\n\n# Good\n[\n x + y\n for x in range(10)\n for y in range(10)\n if x + y > 5\n]\n```\n\n\n### MCC202\n\nA comprehension expression should not contain multiple filters.\n\n```python\n# Bad\n[x for x in range(10) if x % 2 == 0 if x % 3 == 0]\n\n# Good\n[x for x in range(10) if x % 2 == x % 3 == 0]\n```\n\n### MCC203\n\nA comprehension expression should not span over multiple lines.\n\n```python\n# Bad\n[x + y \nfor x in range(10) ]\n\n# Good\n[x+y for x in range(10)]\n```\n\n### MCC204\n\nA comprehension expression should span over multiple lines.\n\n```python\n# Bad\n[x for x in range(10)]\n\n# Good\n[x \nfor x in range(10)]\n```\n\n\n\n## Condition Errors\n\n### MCC220\n\nA multiline conditional expression should place each of its segments\non a separate line.\n\n```python\n# Bad\n1 \nif something() else 0\n\n# Good\n1\nif something()\nelse 0\n```\n\n\n### MCC221\n\nA conditional expression used for assignment should be surrounded by\nparantheses.\n\n```python\n# Bad\na = 1 if something() else 0\n\n# Good\na = (1 if something() else 0)\n```\n\n\n### MCC222\n\nA conditional expression should not contain further conditional\nexpressions.\n\n```python\n# Bad\n1 if x > 0 else -1 if x < 0 else 0\n\n# Good\nif x > 0:\n return 1\nelif x < 0:\n return -1\nelse:\n return 0\n```\n\n\n### MCC223\n\nA conditional expression should not span over multiple lines.\n\n```python\n# Bad\n1\nif something()\nelse 0\n\n# Good\n1 if something() else 0\n```\n\n\n### MCC224\n\nA conditional expression should span over multiple lines.\n\n```python\n# Bad\n1 if something() else 0\n\n# Good\n1\nif something()\nelse 0\n```\n\n\n### MCC225\n\nConditional expressions should not be used.\n",
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