def AppendBuildSetting(self, key, value):

    for configuration in self._properties['buildConfigurations']:
      configuration.AppendBuildSetting(key, value)
Appends value to the build setting for key, which is treated as a list,
dataset/ETHPy150Open adblockplus/gyp/pylib/gyp/xcodeproj_file.py/XCConfigurationList.AppendBuildSetting