Python：下标modu

Question

我试着做这样的事情：

模块.py

def __getitem__(item):
    return str(item) + 'Python'

测试.py

^{pr2}$

我本以为《蒙提ython》会印出来。但是，这不起作用：

TypeError: 'module' object is not subscriptable 

是否可以用纯Python创建一个可订阅的模块（即不修改其源代码、monkey补丁等）？在

Answer 1

>>> class ModModule(object):
    def __init__(self, globals):
        self.__dict__ = globals
        import sys
        sys.modules[self.__name__] = self
    def __getitem__(self, name):
        return self.__dict__[name]


>>> m = ModModule({'__name__':'Mod', 'a':3})
>>> import Mod
>>> Mod['a']
3

# subclassing the actual type won't work
>>> class ModModule(types.ModuleType):
    def __init__(self, globals):
        self.__dict__ = globals
        import sys
        sys.modules[self.__name__] = self
    def __getitem__(self, name):
        return self.__dict__[name]


>>> m = ModModule({'__name__':'Mod', 'a':3})

Traceback (most recent call last):
  File "<pyshell#114>", line 1, in <module>
    m = ModModule({'__name__':'Mod', 'a':3})
  File "<pyshell#113>", line 3, in __init__
    self.__dict__ = globals
TypeError: readonly attribute

您可以使用ModModule（globals（））替换sys中的当前模块。在