python - How to format string width with a runtime calculated variable? -

python - How to format string width with a runtime calculated variable? -

how can set 40 variable allow temp calculate on fly , passed instead of 40 in format string:

{:<40}.format('aa')

something should work:

>>> width = 40 >>> '{0:<{width}}'.format('aa', width=width) 'aa '

python python-2.7