如何将日期添加到文件名？

Question

from datetime import datetime, date, time

now = datetime.now()
print now #2013-05-23 04:07:40.951726    
tar = tarfile.open("test.tar", "w")

如何将日期添加到文件名？例如:test2013_05_23_04_07.tar

Answer 1

使用字符串格式.

from datetime import datetime, date, time

now = datetime.now()
print now #2013-05-23 04:07:40.951726    
tar = tarfile.open("test%s.tar" % now, "w")

或者.format()在Python 3 +中使用

tar = tarfile.open("test{}.tar".format(now), "w")

注意,您还可以决定如何datetime.now()使用.strftime()以下方式显示:

print now.strftime('%Y-%m-%d')
>>> 2013-05-23