Python自定义sorted排序实现方法详解

def compare(strNum1, strNum2):
  newStrNum1 = strNum1 + strNum2
  newStrNum2 = strNum2 + strNum1
  if newStrNum2 > newStrNum1:
    return -1
  elif newStrNum2 == newStrNum1:
    return 0
  else:
    return 1

from functools import cmp_to_key

def compare(strNum1, strNum2):
	"""
	返回最小排列的定义，如果需要最大，将返回值的+1、-1调换即可
	"""
  newStrNum1 = strNum1 + strNum2
  newStrNum2 = strNum2 + strNum1
  if newStrNum2 > newStrNum1:
    return -1
  elif newStrNum2 == newStrNum1:
    return 0
  else:
    return 1

def print_min_nums(nums):
  if not nums:
    return 0

  arr = [str(i) for i in nums]
  newarr = sorted(arr,key=cmp_to_key(compare))
  return "".join(newarr)


if __name__ == '__main__':
  print(print_min_nums([3,32,321]))