问题描述
如何通过程序查找python 3中所有可用导入的列表？我一开始尝试了这个，但无法理解它返回的内容
How to find out list of all available imports in python 3 via program? I tried this at first, but couldn't understand what it returned
import sys
sys.modules
我认为这不是方法，尽管这首先是我的想法。我搜索了网页，发现了这个
I think this isn't the way, although this struck my mind first. I searched the web and found this http://effbot.org/librarybook/core-modules-index.htm
有人可以告诉我这是否正确吗？
Can someone tell me whether this is correct or not?
推荐答案
来自（在python stdlib上查找文档的好地方）
From http://docs.python.org/library/sys.html (a good place to look for documentation on python stdlib)
是一个字符串的元组（有点像不可变的匿名结构），给
编译成这个Python
解释器的所有模块的名称。
is a tuple (a bit like a immutable anonymous structs) of strings giving the names of all modules that are compiled into this Python interpreter.
sys.modules
这是一个将模块名称映射到模块的字典（模块对象）已经加载的
。这可以被操纵以强制
重新加载模块和其他技巧。请注意，从此字典中删除模块
与在
对应的模块对象上调用 reload（）不同。
This is a dictionary that maps module names to modules (module objects) which have already been loaded. This can be manipulated to force reloading of modules and other tricks. Note that removing a module from this dictionary is not the same as calling reload() on the corresponding module object.
因此模块是一个字典（模块名称到实际模块对象的映射）。要获得名称类型 sys.modules.keys（）尽管它可能没那么有用。
So modules is a dictionary (a mapping of module names to the actual module objects). To get just the names type sys.modules.keys() although it probably isn't that usefull.
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