Python3的更新:(引用自已经回答的答案，因为这里的最后一个编辑/注释建议使用一个已弃用的方法)

在python3中，reload被移动到imp模块。在3.4中，弃用了imp，改用了importlib，并在后者中添加了reload。当目标为3或更高版本时，在调用reload或import时引用适当的模块。

导读:

Python3 >= 3.4: importlib.reload(packagename) Python3 < 3.4: imp.reload(packagename) Python2:继续

使用重载内置函数:

https://docs.python.org/2/library/functions.html#reload

When reload(module) is executed: Python modules’ code is recompiled and the module-level code reexecuted, defining a new set of objects which are bound to names in the module’s dictionary. The init function of extension modules is not called a second time. As with all other objects in Python the old objects are only reclaimed after their reference counts drop to zero. The names in the module namespace are updated to point to any new or changed objects. Other references to the old objects (such as names external to the module) are not rebound to refer to the new objects and must be updated in each namespace where they occur if that is desired.

例子:

# Make a simple function that prints "version 1"
shell1$ echo 'def x(): print "version 1"' > mymodule.py

# Run the module
shell2$ python
>>> import mymodule
>>> mymodule.x()
version 1

# Change mymodule to print "version 2" (without exiting the python REPL)
shell2$ echo 'def x(): print "version 2"' > mymodule.py

# Back in that same python session
>>> reload(mymodule)
<module 'mymodule' from 'mymodule.pyc'>
>>> mymodule.x()
version 2

上面所有关于reload()或imp.reload()的答案都已弃用。

Reload()不再是python 3中的内置函数，并且imp. Reload()被标记为已弃用(参见help(imp))。

最好使用importlib.reload()。

import sys
del sys.modules['module_name']

蜻蜓的回答对我有用(python 3.4.3)。

import sys
del sys.modules['module_name']

下面是一个较低层次的解决方案:

exec(open("MyClass.py").read(), globals())

不确定这是否完成了所有预期的事情，但你可以这样做:

>>> del mymodule
>>> import mymodule

Python3的更新:(引用自已经回答的答案，因为这里的最后一个编辑/注释建议使用一个已弃用的方法)

在python3中，reload被移动到imp模块。在3.4中，弃用了imp，改用了importlib，并在后者中添加了reload。当目标为3或更高版本时，在调用reload或import时引用适当的模块。

导读:

Python3 >= 3.4: importlib.reload(packagename) Python3 < 3.4: imp.reload(packagename) Python2:继续

使用重载内置函数:

https://docs.python.org/2/library/functions.html#reload

When reload(module) is executed: Python modules’ code is recompiled and the module-level code reexecuted, defining a new set of objects which are bound to names in the module’s dictionary. The init function of extension modules is not called a second time. As with all other objects in Python the old objects are only reclaimed after their reference counts drop to zero. The names in the module namespace are updated to point to any new or changed objects. Other references to the old objects (such as names external to the module) are not rebound to refer to the new objects and must be updated in each namespace where they occur if that is desired.

例子:

# Make a simple function that prints "version 1"
shell1$ echo 'def x(): print "version 1"' > mymodule.py

# Run the module
shell2$ python
>>> import mymodule
>>> mymodule.x()
version 1

# Change mymodule to print "version 2" (without exiting the python REPL)
shell2$ echo 'def x(): print "version 2"' > mymodule.py

# Back in that same python session
>>> reload(mymodule)
<module 'mymodule' from 'mymodule.pyc'>
>>> mymodule.x()
version 2