How to re import an updated package while in Python Interpreter? [duplicate]

Question

Update for Python3: (quoted from the already-answered answer, since the last edit/comment here suggested a deprecated method)

In Python 3, reload was moved to the imp module. In 3.4, imp was deprecated in favor of importlib, and reload was added to the latter. When targeting 3 or later, either reference the appropriate module when calling reload or import it.

Takeaway:

• Python3 >= 3.4: importlib.reload(packagename)
• Python3 < 3.4: imp.reload(packagename)
• Python2: continue below

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Use the reload builtin function:

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.

Example:

# 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

All the answers above about reload() or imp.reload() are deprecated.

reload() is no longer a builtin function in python 3 and imp.reload() is marked deprecated (see help(imp)).

It's better to use importlib.reload() instead.

So, far I have been exiting and reentering the Interpreter because re importing the file again is not working for me.

Yes, just saying import again gives you the existing copy of the module from sys.modules.

You can say reload(module) to update sys.modules and get a new copy of that single module, but if any other modules have a reference to the original module or any object from the original module, they will keep their old references and Very Confusing Things will happen.

So if you've got a module a, which depends on module b, and b changes, you have to ‘reload b’ followed by ‘reload a’. If you've got two modules which depend on each other, which is extremely common when those modules are part of the same package, you can't reload them both: if you reload p.a it'll get a reference to the old p.b, and vice versa. The only way to do it is to unload them both at once by deleting their items from sys.modules, before importing them again. This is icky and has some practical pitfalls to do with modules entries being None as a failed-relative-import marker.

And if you've got a module which passes references to its objects to system modules — for example it registers a codec, or adds a warnings handler — you're stuck; you can't reload the system module without confusing the rest of the Python environment.

In summary: for all but the simplest case of one self-contained module being loaded by one standalone script, reload() is very tricky to get right; if, as you imply, you are using a ‘package’, you will probably be better off continuing to cycle the interpreter.

In Python 3, the behaviour changes.

>>> import my_stuff

... do something with my_stuff, then later:

>>>> import imp
>>>> imp.reload(my_stuff)

and you get a brand new, reloaded my_stuff.

No matter how many times you import a module, you'll get the same copy of the module from sys.modules - which was loaded at first import mymodule

I am answering this late, as each of the above/previous answer has a bit of the answer, so I am attempting to sum it all up in a single answer.

Using built-in function:

For Python 2.x - Use the built-in reload(mymodule) function.

For Python 3.x - Use the imp.reload(mymodule).

For Python 3.4 - In Python 3.4 imp has been deprecated in favor of importlib i.e. importlib.reload(mymodule)

Few caveats:

• It is generally not very useful to reload built-in or dynamically loaded modules. Reloading sys, __main__, builtins and other key modules is not recommended.
• In many cases extension modules are not designed to be initialized more than once, and may fail in arbitrary ways when reloaded. If a module imports objects from another module using from ... import ..., calling reload() for the other module does not redefine the objects imported from it — one way around this is to re-execute the from statement, another is to use import and qualified names (module.name) instead.
• If a module instantiates instances of a class, reloading the module that defines the class does not affect the method definitions of the instances — they continue to use the old class definition. The same is true for derived classes.

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External packages:

reimport - Reimport currently supports Python 2.4 through 2.7.

xreload- This works by executing the module in a scratch namespace, and then patching classes, methods and functions in place. This avoids the need to patch instances. New objects are copied into the target namespace.

livecoding - Code reloading allows a running application to change its behaviour in response to changes in the Python scripts it uses. When the library detects a Python script has been modified, it reloads that script and replaces the objects it had previously made available for use with newly reloaded versions. As a tool, it allows a programmer to avoid interruption to their workflow and a corresponding loss of focus. It enables them to remain in a state of flow. Where previously they might have needed to restart the application in order to put changed code into effect, those changes can be applied immediately.

Basically reload as in allyourcode's asnwer. But it won't change underlying the code of already instantiated object or referenced functions. Extending from his answer:

#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
>>> x = mymodule.x
>>> x()
version 1
>>> x is mymodule.x
True


# 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
>>> x()
version 1
>>> x is mymodule.x
False