编辑：还有parsedatetime：
#!/usr/bin/env python
from datetime import datetime
import parsedatetime as pdt # $ pip install parsedatetime
cal = pdt.Calendar()
for time_str in ['1 second', '2 minutes','3 hours','5 weeks','6 months','7 years']:
diff = cal.parseDT(time_str, sourceTime=datetime.min)[0] - datetime.min
print("{time_str:<10} -> {diff!s:>20} <{diff!r}>".format(**vars()))
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