Python3 实现减少可调用对象的参数个数

def func(a, b, c, d):
  print(a, b, c, d)

from functools import partial

s1 = partial(func, 1) # a = 1
print(s1(2, 3, 4))
(1, 2, 3, 4)

s2 = partial(func, d=100)  # d = 100
print(s2(1, 2, 3))
(1, 2, 3, 100)

s3 = partial(func, 1, 2, d=100) # a = 1, b = 2, d = 100
print(s3(3))
(1, 2, 3, 100)

import math

points = [(1, 2), (3, 4), (5, 6), (7, 8)]
pt = (4, 3)

def distance(p1, p2):
  x1, y1 = p1
  x2, y2 = p2
  return math.hypot(x2 - x1, y2 - y1)

points.sort(key=partial(distance, pt))
print(points)
[(3, 4), (1, 2), (5, 6), (7, 8)]

points.sort(key=lambda x: distance(pt, x))
print(points)
[(3, 4), (1, 2), (5, 6), (7, 8)]