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N( R&RR%R'RMt isinstancetInstalledDistributionRR#(Rtgen_disttgen_eggR((s@/usr/lib/python2.7/site-packages/pip/_vendor/distlib/database.pyt_generate_caches  cCs)|jdd}dj||gtS(uo The *name* and *version* parameters are converted into their filename-escaped form, i.e. any ``'-'`` characters are replaced with ``'_'`` other than the one in ``'dist-info'`` and the one separating the name from the version number. :parameter name: is converted to a standard distribution name by replacing any runs of non- alphanumeric characters with a single ``'-'``. :type name: string :parameter version: is converted to a standard version string. 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