what's the function of tag '#' while using python string format option -


i using python string format option, , after reading document, still confused '#' cause don't know meaning of phrase 'the value conversion use “alternate form” (where defined below).'. great helps me.

here test: 

print '%#sabc' % 'abc'

'abcabc' 

print '%#fabc' % 1.2

1.200000abc

that great if there examples of usage of '#' here.

the "alternative form" changes behavior of selected conversion slightly.

your example floating point representation:

'f': floating point decimal format.

>>> print("%.0f" % 1) 1

the alternate form causes result contain decimal point, if no digits follow it.

>>> print("%#.0f" % 1) 1.

example hexadecimal representation:

'x': signed hexadecimal (lowercase).

>>> print("%x" % -11) -b

the alternate form causes leading '0x' [...] inserted before first digit.

>>> print("%#x" % -11) -0xb

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