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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 getHelp(self, call=""):
 """ API to get a list of supported REST APIs. In the case a particular API is specified, the docstring of that API is displayed. :param call: call to get detailed information about (Optional) :type call: str :return: List of APIs or detailed information about a specific call (parameters and docstring) :rtype: List of strings or a dictionary containing params and doc keys depending on the input parameter """

        if call:
            params = self.methods['GET'][call]['args']
            doc = self.methods['GET'][call]['call'].__doc__
            return dict(params=params, doc=doc)
        else:
            return self.methods['GET'].keys()