Installation

Install from pip with:

pip install flake8-fill-one-line

Reported errors

Used options

• max_line_length - option from Flake8, length limit for line

• skip-std-names - ignore tuple(), list(), set(), dict() calls (used by default)

• skip-multiline-arguments - ignore function calls with arguments on multiple lines (used by default)

Examples

• Imports:

# wrong:
import sys, \
    argparse
from random import randint as rand_int, \
    sample, choice as \
    random_choice

# right:
import sys, argparse
from random import randint as rand_int, sample, choice as random_choice

• Calls and assignments

# wrong:
f(1, 2, 3,
  4, 5, 6, 7,
  8, 9)

# right:
f(1, 2, 3, 4, 5, 6, 7, 8, 9)


# wrong:
some_var = foo(1,
               a=3,
               b=42)

# right:
some_var = foo(1, a=3, b=42)


# wrong:
def f(a: int, b: int) -> int:
    return f1(a,
              b,
              a + b)

# right:
def f(a: int, b: int) -> int:
    return f1(a, b, a + b)


# wrong:
def foo(a: int, b: int):
    return a - b * 3 if \
        b < 4 \
        else foo(a - 1, b + 1)

# right:
def foo(a: int, b: int):
    return a - b * 3 if b < 4 else foo(a - 1, b + 1)

• Function definitions

# wrong
def f(a,
      b,
      c):
    return a + b * c

# right:
def f(a, b, c):
    return a + b * c


# wrong
def f2(
        a: str,
        b: tuple, *some_args,
        **kwargs_name
       ) -> str:
    pass

# right:
def f2(a: str, b: tuple, *some_args, **kwargs_name) -> str:
    pass

• With statements

# wrong:
with open("some_file.txt") as \
        f:
    f.read()

# right:
with open("some_file.txt") as f:
    f.read()


# wrong:
with open("f1.txt") as f1, \
        open("f2.txt", "w") as f2:
    f2.write(f1.read())

# right:
with open("f1.txt") as f1, open("f2.txt", "w") as f2:
    f2.write(f1.read())

• If statements

# wrong:
if (
    a < b and
    c < d and
    a + b == c - d
):
    pass

# right:
if a < b and c < d and a + b == c - d:
    pass


# wrong:
if a < \
        b:
    pass

# right:
if a < b:
    pass


# wrong:
for i in range(100):
    if (i < 5 or
            i > 10):
        pass
    elif i == 2 or \
        i == 3 or i == 11 \
            or i == 28:
        pass
    elif 47 <= i <= 58:
        pass
    elif i * (20 -
              i) < 0:
        pass

# right:
for i in range(100):
    if i < 5 or i > 10:
        pass
    elif i == 2 or i == 3 or i == 11 or i == 28:
        pass
    elif 47 <= i <= 58:
        pass
    elif i * (20 - i) < 0:
        pass