def find_in_map(map_name, key, value):
    return {'Fn::FindInMap': [map_name, key, value]}
The intrinsic function Fn::FindInMap returns the value of a key from a     mapping declared in the Mappings section.
dataset/ETHPy150Open seandst/cfn-pyplates/cfn_pyplates/functions.py/find_in_map