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(?P<name>[A-Za-z][A-Za-z0-9_.\-]*) # Python distribution name
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(?P<vrange>(?:-?\d\.\d+(?:-(?:\d\.\d+)?)?)?) # version range
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(?P<dependency>(?:[a-z][^;]*)?) # Debian dependency
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(?P<name>[A-Za-z][A-Za-z0-9_.]*) # Python distribution name
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s> Translate Python version into Debian one.
>>> _translate('1.C2betac', ['s/c//gi'], None)
'1.2beta'
>>> _translate('5-fooa1.2beta3-fooD',
... ['s/^/1:/', 's/-foo//g', 's:([A-Z]):+$1:'], 'PEP386')
'1:5~a1.2~beta3+D'
>>> _translate('x.y.x.z', ['tr/xy/ab/', 'y,z,Z,'], None)
'a.b.a.Z'
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