3 examples of 'how to import python file from another folder' in Python

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def _import_from(mod, path, mod_dir=None):
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    """
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    Imports a module from a specific path
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    :param mod:
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        A unicode string of the module name
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    :param path:
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        A unicode string to the directory containing the module
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    :param mod_dir:
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        If the sub directory of "path" is different than the "mod" name,
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        pass the sub directory as a unicode string
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    :return:
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        None if not loaded, otherwise the module
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    """
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    if mod_dir is None:
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        mod_dir = mod
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    if not os.path.exists(path):
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        return None
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    if not os.path.exists(os.path.join(path, mod_dir)):
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        return None
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    try:
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        mod_info = imp.find_module(mod_dir, [path])
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        return imp.load_module(mod, *mod_info)
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    except ImportError:
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        return None

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def __import__(name, globals=None, locals=None, fromlist=None):
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    """An alternative to the import function so that we can import
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    modules defined as strings.
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    This code was taken from: http://docs.python.org/lib/examples-imp.html
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    """
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    # Fast path: see if the module has already been imported.
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    try:
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        return sys.modules[name]
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    except KeyError:
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        pass
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    # If any of the following calls raises an exception,
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    # there's a problem we can't handle -- let the caller handle it.
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    module_name = name.split('.')[-1]
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    module_path = os.path.join(EXAMPLE_DIR, *name.split('.')[:-1])
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    fp, pathname, description = imp.find_module(module_name, [module_path])
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    try:
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        return imp.load_module(module_name, fp, pathname, description)
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    finally:
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        # Since we may exit via an exception, close fp explicitly.
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        if fp:
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            fp.close()

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def _get_module_from_containing_folder(source_path, module_name):
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    # module_name is a module directly inside source_path
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    module = imp.load_source(module_name, source_path)
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    return module