How to escape character '.' in python string replacement via the operator %

I want to do the following

"@file %(unitname).C" % {'unitname开发者_如何学运维':'Test'}

but it complains about the '.C'. How can I escape the '.' character?

You don't. You fix the format specifier.

"@file %(unitname)s.C" % {'unitname':'Test'}

Another option is,

"@file {unitname}.C".format(unitname='Test')

This may be preferable, since format() will be the new standard in Python 3.