如何在Python中导入变量包，就像在PHP中使用变量变量（$$）一样？

How do I import variable packages in Python like using variable variables ($$) in PHP?

我想根据用户选择的值导入一些包。

默认值为file1.py：

1	from files import file1

如果用户选择file2，则应为：

1	from files import file2

号

在PHP中，我可以使用变量：

1 2	$file_name = 'file1'; include($$file_name);

1 2	$file_name = 'file2'; include($$file_name);

。

我怎样才能在python中做到这一点？

相关讨论

正如Fredrik Lundh所说：

Anyway, here’s how these statements and functions work:

import X imports the module X, and creates a reference to that module
in the current namespace. Or in other words, after you’ve run this
statement, you can use X.name to refer to things defined in module X.

from X import * imports the module X, and creates references in the
current namespace to all public objects defined by that module (that
is, everything that doesn’t have a name starting with"_"). Or in
other words, after you’ve run this statement, you can simply use a
plain name to refer to things defined in module X. But X itself is not
defined, so X.name doesn’t work. And if name was already defined, it
is replaced by the new version. And if name in X is changed to point
to some other object, your module won’t notice.

from X import a, b, c imports the module X, and creates references in
the current namespace to the given objects. Or in other words, you can
now use a and b and c in your program.

Finally, X = __import__(‘X’) works like import X, with the difference
that you 1) pass the module name as a string, and 2) explicitly assign
it to a variable in your current namespace.

号

顺便说一下，这是你最不感兴趣的方法。

简单地写(例如)：

1 2	var ="datetime" module = __import__(var)