def get_gvalue(self, keyword):
    "Retrieve a requested global keyword value\n\n        The method returns the value of the keyword\n        which matches the requested value.\n        If there is no matching keyword, 'None'\n        is returned.\n\n        Parameters\n        ----------\n        keyword: str\n            name of the requested keyword\n\n        Returns\n        -------\n        The keyword value\n        "
    rvalue = None
    key = self.get_gkey(keyword)
    if key:
        rvalue = key.keyvalue
    return rvalue
Retrieve a requested global keyword value

The method returns the value of the keyword
which matches the requested value.
If there is no matching keyword, 'None'
is returned.

Parameters
----------
keyword: str
    name of the requested keyword

Returns
-------
The keyword value
def get_gvalue(self, keyword):
    "Retrieve a requested global keyword value\n\n        The method returns the value of the keyword\n        which matches the requested value.\n        If there is no matching keyword, 'None'\n        is returned.\n\n        Parameters\n        ----------\n        keyword: str\n            name of the requested keyword\n\n        Returns\n        -------\n        The keyword value\n        "
    rvalue = None
    key = self.get_gkey(keyword)
    if key:
        rvalue = key.keyvalue
    return rvalue