convert number to string in python

Question

I meet a problem about converting number to string.

I want to get a string \"0100\" from str(0100), but what I got is \"64\". Does any way I can do to get a string \"010

Answer 1

You could just concatenate both strings so if you want 0100

res = str(0) + str(100)

that way res = '0100'

Answer 2

The integer should be written as 100, not 0100.

You can format the string with leading zeros like this:

>>> "%04d" % 100
'0100'

Answer 3

Your first issue is that the literal "0100", because it begins with a digit 0, is interpreted in octal instead of decimal. By contrast, str(100) returns "100" as expected.

Secondly, it sounds like you want to zero-fill your numbers to a fixed width, which you can do with the zfill method on strings. For example, str(100).zfill(4) returns "0100".

Answer 4

In Python2, a leading 0 on a numeric literal signifies that it is an octal number. This is why 0100 == 64. This also means that 0800 and 0900 are syntax errors

It's a funny thing that's caught out many people at one time or another.

In Python3, 0100 is a syntax error, you must use the 0o prefix if you need to write a octal literal. eg. 0o100 == 64

Answer 5

Not sure if I understood the question... maybe you're looking for this:

'%04o' % 0100  # 0100