如何以列表或元组的形式输入参数？

Question

是否可以以列表的形式输入函数的参数.例如 -

list1 = ["somethin","some"]
def paths(list):
    import os
    path = os.path.join() #I want to enter the parameters of this function from the list1
    return path

好的,我得到了我的答案,但只是一个附加问题,仅与此相关 - 这是我的代码 -

def files_check(file_name,sub_directories):
    """
        file_name :The file to check
        sub_directories :If the file is under any other sub directory other than the   application , this is a list.
    """
    appname = session.appname
    if sub_directories:
        path = os.path.join("applications",
                        appname,
                        *sub_directories,
                         file_name)
        return os.path.isfile(path)
    else:
         path = os.path.join("applications",
                        appname,
                        file_name)
         return os.path.isfile(path)

我收到此错误 -

 SyntaxError: only named arguments may follow *expression

请帮我 .

Answer 1

您可以使用splat运算符()解压缩序列*:

path = os.path.join(*my_list)

演示:

>>> import os
>>> lis = ['foo', 'bar']
>>> os.path.join(*lis)
'foo\\bar'

更新:

要回答你的新问题,一旦你*在参数中使用了你就不能传递位置参数,你可以在这里做类似的事情:

from itertools import chain

def func(*args):
    print args

func(1, 2, *chain(range(5), [2]))
#(1, 2, 0, 1, 2, 3, 4, 2)

并且不要list用作变量名