helpers.py 文件源码

def datetime_u(s):
    fmt = "%Y-%m-%dT%H:%M:%S"
    try:
        return _strptime(s, fmt)
    except ValueError:
        try:
            # strip zulu timezone suffix or utc offset
            if s[-1] == "Z" or (s[-3] == ":" and s[-6] in (' ', '-', '+')):
                try:
                    import iso8601
                    return iso8601.parse_date(s)
                except ImportError:
                    pass

                try:
                    import isodate
                    return isodate.parse_datetime(s)
                except ImportError:
                    pass

                try:
                    import dateutil.parser
                    return dateutil.parser.parse(s)
                except ImportError:
                    pass

                warnings.warn('removing unsupported "Z" suffix or UTC offset. Install `iso8601`, `isodate` or `python-dateutil` package to support it', RuntimeWarning)
                s = s[:-1] if s[-1] == "Z" else s[:-6]
            # parse microseconds
            try:
                return _strptime(s, fmt + ".%f")
            except:
                return _strptime(s, fmt)
        except ValueError:
            # strip microseconds (not supported in this platform)
            if "." in s:
                warnings.warn('removing unsuppported microseconds', RuntimeWarning)
                s = s[:s.index(".")]
            return _strptime(s, fmt)