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Make Python code cooler. 100% coverage. Use and enjoy this code!


pip install cool

Or fetch from github

pip install git+



Note: as fast as you didn't use F!

Use pipeline to pass data as a positional parameter to the next function.

from cool import F

assert range(10) | F(filter, lambda x: x % 2) | F(sum) == 25

Or you need to pass multiple parameters through the pipeline. Note that FF can only accept one parameter, and it must be an iterable object.

from cool import FF

assert (1, 2) | FF(lambda x, y: x + y) == 3

You can use ... as a placeholder. This is useful when you need to pass non-continuous parameters to create a partial function.

from functools import reduce
from cool import F

assert range(10) | F(reduce, lambda x, y: x + y) == 45
assert range(10) | F(reduce, lambda x, y: x + y, ..., 10) == 55

square = F(pow, ..., 2)
assert range(10) | F(map, square) | F(sum) == 285

The range(10) | F(reduce, lambda x, y: x + y, ..., 10) is equivalent to reduce(lambda x, y: x + y, range(10), 10).


Just like the redirection symbol in Shell, you can redirect the output to a specified file or TextIO object through > or >>.

Note: R inherits from functools.partial.

from pathlib import PurePath
from cool import R

# Redirect output to specified filepath
R(print, "hello") > PurePath("your-filepath")

# Append mode
R(print, "world") >> PurePath("your-filepath")

Redirect to opened file or other streams.

from io import StringIO
from cool import R

with open("filepath", "a+", encoding="utf8") as file:
    R(print, "hello") >> file

out = StringIO("")
R(print, "hello") > out, 0)
assert == "hello\n"

Maybe you also want to block the output, just like > /dev/null.

from cool import R

R(print, "hello") > None
# Or
R(print, "hello") >> None

Note that after the calculation is over, R will faithfully return the return value of your function. Try the following example.

from pathlib import PurePath
from cool import F, R

def func(num):
    return range(num) | F(map, lambda x: print(x) or x) | F(sum)

print(R(func, 10) > PurePath("filepath"))

Set Global

Maybe you don't want to use from cool import F in every file of the entire project, you can use the following code to set it as a global function, just like min/max/sum.

import cool

cool.set_global(cool.F, cool.FF)

Maybe you also want to expose functools.reduce to the world, just like map/filter.

import functools
import cool

cool.set_global(cool.F, cool.FF, functools.reduce)

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