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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"DuplicateFlagError when module with gflags definition is reimported","articleBody":"```\nA DuplicateFlagError is thrown when:\n1) Module A imports the gflags module and defines gflags.\n2) Module A imports B\n3) Module B imports A\n\nExample:\n\nFile main.py:\n---------------------------------\n#!/usr/bin/python2.6\n\nimport sys\nimport gflags\nimport dep   # error\n\nFLAGS = gflags.FLAGS\ngflags.DEFINE_boolean(\"example\", True, \"example_flag\")\n\nif __name__ == \"__main__\":\n  FLAGS(sys.argv)\n  print FLAGS.example\n\n---------------------------------\n\n\nFile dep.py:\n---------------------------------\n#!/usr/bin/python2.6\n\nimport main\n---------------------------------\n\n\nError output:\n---------------------------------\nTraceback (most recent call last):\n  File \"example\\main.py\", line 10, in \u003cmodule\u003e\n    gflags.DEFINE_boolean(\"example\", True, \"example_flag\")\n  File \"C:\\gflags\\python\\gflags.py\", line 2378, in DEFINE_boolean\n    DEFINE_flag(BooleanFlag(name, default, help, **args), flag_values)\n  File \"C:\\gflags\\python\\gflags.py\", line 2190, in DEFINE_flag\n    fv[flag.name] = flag\n  File \"C:\\gflags\\python\\gflags.py\", line 1040, in __setitem__\n    raise DuplicateFlagError(name, self)\ngflags.DuplicateFlagError: The flag 'example' is defined twice. First from \nmain, Second from example\\main.py\n\n```\n\nOriginal issue reported on code.google.com by `linshu...@google.com` on 26 Mar 2012 at 7:11\n","author":{"url":"https://github.com/GoogleCodeExporter","@type":"Person","name":"GoogleCodeExporter"},"datePublished":"2015-07-20T02:23:56.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/9/python-gflags/issues/9"}