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I would like to use a variable to specify the number of decimals to format as in this case: (python 3.4.6)

print(str.format('{0:.intVariableName}',1.2345678))
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  • print(str.format('{0:.3}',1.2345678)) .. works, I would like to use a variable instead of 3. Commented Nov 29, 2018 at 19:07
  • also working: print('{:.{}}'.format(1.2345678, 3)) and print('{:.{var}}'.format(1.2345678, var=3)) - this also omits using explicit indexes for formatting using implicitly order of provided params Commented Nov 29, 2018 at 19:19

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You can use variable name as another argument in format function:

In [29]: print(str.format('{0:.{var}}',1.2345678, var=3))
1.23
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