[issue4631] urlopen returns extra, spurious bytes

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

On the principle, the test looks good.
If you want to avoid the 'if "%" in value' hack, you can use the
named-parameter form of string formatting:

>>> "localhost:%(port)s" % dict(port=8080)
'localhost:8080'
>>> "localhost" % dict(port=8080)
'localhost'

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