Python number/string zero complement operation example code

Sometimes when using Python, you want to zero out a number or string, i.e., turn a 1 into an eight-digit 00000001, and you can use the following methods to zero out a number or string.

String complementary zero:

You can use the zfill() function to fill a string with zeros:

>>> str = "123"
>>> print((8))
00000123

It is also possible to convert an integer to a character to make up zeros using zfill().

>>> num = 123
>>> print(str(num).zfill(8))
00000123

Numbers make up the zeros:

Numbers can be formatted to make up zeros:

>>> number = 123
>>> zfnumber = "%08d" % number
>>> print(zfnumber)
00000123
>>> type(zfnumber)
<class 'str'>

You can see that the formatted numeric type changes to a character type.

python prepends zeros to the output integer.

There are a number of different digits of the number, such as 1, 22, 333, 4444, the normal output as a number or a string may not be the same number of digits, some of the time the output to the text in the subsequent processing will bring trouble. If you want to ensure that the same number of digits, in front of the complement 0.

The operation is very simple, just use s = '%04d' % n to convert to a string.

give me an example

for n in range(1000):
    s = '%04d' % n 
    print(s)

One of the very small problems is that if the 0 in %04d is left out, there is a problem with writing it as %4d.

summarize

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