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python argument expansion

admin 11月 14, 2020 0

* operator: positional argument expansion
for a list, expand to function call argument list
** operator: keyword argument expansion for a dictionary, expand to function call keyword argument list

def add(a, b):
  print a+b

a = [1, 2]
kwargs={'b':1, 'a': 1}
add(*a)
add(**kwargs)


def add(a, *args, **kwargs):
  print a      # positional argument
  print args   # a list
  print kwargs # a dict