Nicest way to pad zeroes to string

2018-06-19 06:42:23

什么是填充数字字符串最左边的零的最pythonic方式，即，所以数字字符串具有特定的长度？

Strings:

>>> n = '4'
>>> print n.zfill(3)
004

And for numbers:

>>> n = 4
>>> print '%03d' % n
004
>>> print format(n, '03') # python >= 2.6
004
>>> print '{0:03d}'.format(n)  # python >= 2.6
004
>>> print '{foo:03d}'.format(foo=n)  # python >= 2.6
004
>>> print('{:03d}'.format(n))  # python >= 2.7 + python3
004
>>> print('{0:03d}'.format(n))  # python 3
004
>>> print(f'{n:03}') # python >= 3.6
004

String formatting documentation.

Just use the rjust method of the string object.

This example will make a string of 10 characters long, padding as necessary.

>>> t = 'test'
>>> t.rjust(10, '0')
>>> '000000test'

For numbers:

print "%05d" % number

See also: Python: String formatting.

EDIT : It's worth noting that as of yesterday December 3rd, 2008, this method of formatting is deprecated in favour of the format string method:

print("{0:05d}".format(number)) # or
print(format(number, "05d"))

See PEP 3101 for details.

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