reload.py 文件源码

def reload(module, debug=False, lists=False, dicts=False):
    """Replacement for the builtin reload function:
    - Reloads the module as usual
    - Updates all old functions and class methods to use the new code
    - Updates all instances of each modified class to use the new class
    - Can update lists and dicts, but this is disabled by default
    - Requires that class and function names have not changed
    """
    if debug:
        print("Reloading %s" % str(module))

    ## make a copy of the old module dictionary, reload, then grab the new module dictionary for comparison
    oldDict = module.__dict__.copy()
    builtins.reload(module)
    newDict = module.__dict__

    ## Allow modules access to the old dictionary after they reload
    if hasattr(module, '__reload__'):
        module.__reload__(oldDict)

    ## compare old and new elements from each dict; update where appropriate
    for k in oldDict:
        old = oldDict[k]
        new = newDict.get(k, None)
        if old is new or new is None:
            continue

        if inspect.isclass(old):
            if debug:
                print("  Updating class %s.%s (0x%x -> 0x%x)" % (module.__name__, k, id(old), id(new)))
            updateClass(old, new, debug)

        elif inspect.isfunction(old):
            depth = updateFunction(old, new, debug)
            if debug:
                extra = ""
                if depth > 0:
                    extra = " (and %d previous versions)" % depth
                print("  Updating function %s.%s%s" % (module.__name__, k, extra))
        elif lists and isinstance(old, list):
            l = old.len()
            old.extend(new)
            for i in range(l):
                old.pop(0)
        elif dicts and isinstance(old, dict):
            old.update(new)
            for k in old:
                if k not in new:
                    del old[k]



## For functions:
##  1) update the code and defaults to new versions.
##  2) keep a reference to the previous version so ALL versions get updated for every reload