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user_id=113859

Found the problem. If the "import gadfly" already worked
than you can import gadfly from backends already.
Thus here is code that actually works:

try:
    import gadfly
    import gadfly.client
except ImportError, message:
    if str(message)=='No module named client':
        # make sure that gadfly cannot be imported from this
module
        del gadfly
    else:·
        if ( str(message) != 'No module named gadfly'): raise