Python:kwargs.pop() 和 kwargs.get() 之间的区别

Question

两种方法我都见过，但我不明白它们的区别以及我应该将什么作为“最佳实践”:

def custom_function(**kwargs):
    foo = kwargs.pop('foo')
    bar = kwargs.pop('bar')
    ...

def custom_function2(**kwargs):
    foo = kwargs.get('foo')
    bar = kwargs.get('bar')
    ...

Answer 1

get(key[, default]): return the value for key if key is in the dictionary, else default. If default is not given, it defaults to None, so that this method never raises a KeyError.

d = {'a' :1, 'c' :2}
print(d.get('b', 0)) # return 0
print(d.get('c', 0)) # return 2

pop(key[, default]) if key is in the dictionary, remove it and return its value, else return default. If default is not given and key is not in the dictionary, a KeyError is raised.

d = {'a' :1, 'c' :2}
print(d.pop('c', 0)) # return 2
print(d) # returns {'a': 1}
print(d.get('c', 0)) # return 0

注意:关于最佳实践问题，我会说这取决于您的用例，但我会默认使用 .get 除非我确实需要 .pop