setup.py 文件源码

def _map_requirement(value):
    m = re.search(r'(\S+)\s*(?:\((.*)\))?', value)
    name = m.group(1)
    version = m.group(2)

    if version is None:
        return name

    else:
        mapped = []
        for v in version.split(','):
            v = v.strip()
            if v[0].isdigit():
                # Checks for a specific version prefix
                m = v.rsplit('.', 1)
                mapped.append('>=%s,<%s.%s'%(
                    v, m[0], int(m[1])+1))

            else:
                mapped.append(v)
        return '%s %s'%(name, ','.join(mapped),)