python - 获取函数的关键字参数，Python

Question

def thefunction(a=1,b=2,c=3):
    pass

print allkeywordsof(thefunction) #allkeywordsof doesnt exist

这会给出 [a,b,c]

有没有类似allkeywordsof的函数？

我不能改变里面的任何东西，函数

Answer 1

我想你在找inspect.getargspec :

import inspect

def thefunction(a=1,b=2,c=3):
    pass

argspec = inspect.getargspec(thefunction)
print(argspec.args)

产量

['a', 'b', 'c']

---

如果您的函数同时包含位置参数和关键字参数，那么查找关键字参数的名称会稍微复杂一些，但不会太难:

def thefunction(pos1, pos2, a=1,b=2,c=3, *args, **kwargs):
    pass

argspec = inspect.getargspec(thefunction)

print(argspec)
# ArgSpec(args=['pos1', 'pos2', 'a', 'b', 'c'], varargs='args', keywords='kwargs', defaults=(1, 2, 3))

print(argspec.args)
# ['pos1', 'pos2', 'a', 'b', 'c']

print(argspec.args[-len(argspec.defaults):])
# ['a', 'b', 'c']