import datetime

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#當(dāng)前時(shí)間
print datetime.datetime.now()
2018-06-13 16:22:42.414143

#當(dāng)前時(shí)間減去七天
print datetime.datetime.now() - datetime.timedelta(days=7)
2018-06-06 16:22:38.271888

print datetime.datetime.now().strftime("%Y%m%d")
20180613