zfill(): pads a numeric string on the left with zeros，zfillpads,# It underst
zfill(): pads a numeric string on the left with zeros，zfillpads,# It underst
# It understands about plus and minus signs:print '12'.zfill(5)print '-3.14'.zfill(7)print '3.14159265359'.zfill(5)# Using the % operator looks like this:import mathprint 'The value of PI is approximately %5.3f.' % math.pi
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