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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 contains_call_signature(caller, key):
 """ Check if a function or method call signature contains a specific argument. Args: caller (Callable):
 Method or function to check if signature is contain in. key (str):
 Signature to look for. Returns: True if ``key`` exits in ``caller`` call signature. Examples: True False True False """

    try:
        args = inspect.signature(caller).parameters
    except AttributeError:
        args = inspect.getargspec(caller).args
    return key in args