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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def path_expand(text):
 """ returns a string with expanded variable. :param text: the path to be expanded, which can include ~ and environment $ variables :param text: string """

    result = os.path.expandvars(os.path.expanduser(text))

    # template = Template(text)
    # result = template.substitute(os.environ)

    if result.startswith("."):
        result = result.replace(".", os.getcwd(), 1)

    return result