Automatically add trailing commas to calls and literals
Project description
add-trailing-comma
A tool (and pre-commit hook) to automatically add trailing commas to calls and literals.
Installation
pip install add-trailing-comma
As a pre-commit hook
See pre-commit for instructions
Sample .pre-commit-config.yaml:
- repo: https://github.com/asottile/add-trailing-comma
rev: v2.0.1
hooks:
- id: add-trailing-comma
multi-line method invocation style -- why?
# Sample of *ideal* syntax
function_call(
argument,
5 ** 5,
kwarg=foo,
)
- the initial paren is at the end of the line
- each argument is indented one level further than the function name
- the last parameter (unless the call contains an unpacking
(
*args/**kwargs)) has a trailing comma
This has the following benefits:
-
arbitrary indentation is avoided:
# I hear you like 15 space indents # oh your function name changed? guess you get to reindent :) very_long_call(arg, arg, arg)
-
adding / removing a parameter preserves
git blameand is a minimal diff:# with no trailing commas x( - arg + arg, + arg2 )
# with trailing commas x( arg, + arg2, )
Implemented features
trailing commas for function calls
x(
arg,
- arg
+ arg,
)
trailing commas for function calls with unpackings
If --py35-plus is passed, add-trailing-comma will also perform the
following change:
x(
- *args
+ *args,
)
y(
- **kwargs
+ **kwargs,
)
Note that this would cause a SyntaxError in earlier python versions.
trailing commas for tuple / list / dict / set literals
x = [
- 1, 2, 3
+ 1, 2, 3,
]
trailing commas for function definitions
def func(
arg1,
- arg2
+ arg2,
):
trailing commas for function definitions with unpacking arguments
If --py36-plus is passed, add-trailing-comma will also perform the
following change:
def f(
- *args
+ *args,
): pass
def g(
- **kwargs
+ **kwargs,
): pass
def h(
- *, kw=1
+ *, kw=1,
): pass
Note that this would cause a SyntaxError in earlier python versions.
trailing commas for from imports
from os import (
path,
- makedirs
+ makedirs,
)
trailing comma for class definitions
class C(
Base1,
- Base2
+ Base2,
):
pass
unhug trailing paren
x(
arg1,
- arg2)
+ arg2,
+)
unhug leading paren
-function_name(arg1,
- arg2)
+function_name(
+ arg1,
+ arg2,
+)
match closing brace indentation
x = [
1,
2,
3,
- ]
+]
remove unnecessary commas
yes yes, I realize the tool is called add-trailing-comma :laughing:
-[1, 2, 3,]
-[1, 2, 3, ]
+[1, 2, 3]
+[1, 2, 3]
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