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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 envGet(self, name, default=None, conv=None):
 """Return value for environment variable or None. @param name: Name of environment variable. @param default: Default value if variable is undefined. @param conv: Function for converting value to desired type. @return: Value of environment variable. """

        if self._env.has_key(name):
            if conv is not None:
                return conv(self._env.get(name))
            else:
                return self._env.get(name)
        else:
            return default