Dynamic Zero Padding.

[Friedrich Clausen]

Hello All,

I want to print some integers in a zero padded fashion, eg. :
Testing 0001

but the padding needs to be dynamic eg. sometimes %05i, %02i or some
other padding amount. But I can't insert a variable into the format
specification to achieve the desirable padding.

I would be much obliged if someone can give me some tips on how to
achieve a variably pad a number.

Cheers,

Fred.

Thanks,

Fred.

 

[Mel]

I want to print some integers in a zero padded fashion, eg. :

Testing 0001

but the padding needs to be dynamic eg. sometimes %05i, %02i or some
other padding amount. But I can't insert a variable into the format
specification to achieve the desirable padding.

I would be much obliged if someone can give me some tips on how to
achieve a variably pad a number.

('%%0%dd' % (pads,)) % (n,)

Probably be good to wrap it in a function. It looks kind of obscure as it
is.

Mel.

 

[harrismh777]

I would be much obliged if someone can give me some tips on how to
achieve a variably pad a number.

testing 0001

kind regards,
m harris

 

[Chris Angelico]

('%%0%dd' % (pads,)) % (n,)

Probably be good to wrap it in a function.  It looks kind of obscure asit
is.

Would get rather pretty (read: ugly and impossible to read) if you
wanted to put a literal percent sign in front of the number.



Chris Angelico

 

[Terry Reedy]

You might want to try "new style" string formatting [1], which I think
is better than the "old style" in this particular case:
'Testing 000000042'

One cannot use a nested field in the 'name' part of the field (before
the ':' (I tried), but are pretty free to nest in the actual
specification part after the ':'.
'7'

 

[Friedrich Clausen]

You might want to try "new style" string formatting [1], which I think
is better than the "old style" in this particular case:

    >>> "Testing {0:0{1}d}".format(42, 4)
   'Testing 0042'
    >>> "Testing {0:0{1}d}".format(42, 9)
   'Testing 000000042'

One cannot use a nested field in the 'name' part of the field (before the
':' (I tried), but are pretty free to nest in the actual specification part
after the ':'.
'7'

Thanks all for the many good suggestions - I am looking over them and
reading the referenced docs.

Cheers,

Fred.