The constructor for functools.partial() detects nesting and automatically flattens itself to a more efficient form. For example:

from functools import partial

def f(*, a: int, b: int, c: int) -> None:
    print(f"Args are {a}-{b}-{c}")

g = partial(partial(partial(f, a=1), b=2), c=3)

# Three function calls are flattened into one; free efficiency.

# Bare function can be called as 3 arguments were bound previously.

This returns:

functools.partial(<function f at 0x7f4fd16c11f0>, a=1, b=2, c=3)
Args are 1-2-3

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