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Help on module virtualenv:

NAME
    virtualenv - Create a "virtual" Python installation

FILE
    /Library/Python/2.7/site-packages/virtualenv.py

CLASSES
    __builtin__.object
        Logger
        fileview
    optparse.IndentedHelpFormatter(optparse.HelpFormatter)
        UpdatingDefaultsHelpFormatter
    optparse.OptionParser(optparse.OptionContainer)
        ConfigOptionParser
    
    class ConfigOptionParser(optparse.OptionParser)
     |  Custom option parser which updates its defaults by checking the
     |  configuration files and environmental variables
     |  
     |  Method resolution order:
     |      ConfigOptionParser
     |      optparse.OptionParser
     |      optparse.OptionContainer
     |  
     |  Methods defined here:
     |  
     |  __init__(self, *args, **kwargs)
     |  
     |  get_config_files(self)
     |  
     |  get_config_section(self, name)
     |      Get a section of a configuration
     |  
     |  get_default_values(self)
     |      Overridding to make updating the defaults after instantiation of
     |      the option parser possible, update_defaults() does the dirty work.
     |  
     |  get_environ_vars(self, prefix='VIRTUALENV_')
     |      Returns a generator with all environmental vars with prefix VIRTUALENV
     |  
     |  update_defaults(self, defaults)
     |      Updates the given defaults with values from the config files and
     |      the environ. Does a little special handling for certain types of
     |      options (lists).