build.py 文件源码

def write(self, revision, sourcefile):
        """
        Finalize the __version__ = major.minor.micro.{revision} tag.
        Overwrite C{sourcefile} in place by substituting the {revision} macro.

        @param revision: revision number to write to the source file.
        @type revision: int
        @param sourcefile: python source file with a __version__ tag, typically
                           "csb/__init__.py"
        @type sourcefile: str

        @return: sourcefile.__version__
        """
        content = open(sourcefile).readlines()

        with open(sourcefile, 'w') as src:
            for line in content:
                if line.startswith('__version__'):
                    src.write(line.format(revision=revision))
                else:
                    src.write(line)

        self._delcache(sourcefile)
        return imp.load_source('____source', sourcefile).__version__