CODEWITHSUNDEEP
pythonpython-3.xtextformat
Farzin Nasiri
Farzin Nasiri

Reputation: 730

Using format() to center align and set precision which are given as inputs

this is my problem:consider a number like 29.8245,given an amount for precision first this number should be rounded,for instance for precision =0 it would be 30.Now this number should be center aligned in a string with a given width. for instance if width = 10 then the final result would be:' 30 ' For this particular example I came up with:

"{:^10}".format("{0:.0f}".format(29.8245))

the problem is that now the numbers are hard coded and I don't know how to fix that to get the inputs into my code.I know that :

"{}".format()

is what we use in normal cases but in this problem I don't know how to combine these two codes(I don't even know is it possible or not). Also is there a better approach to solve the problem?

Upvotes: 3

Views: 2125

Answers (3)

wim
wim

Reputation: 362766

This is exactly why format strings support nesting:

>>> width = 10
>>> precision = 0
>>> num = 29.825
>>> f'{num:^{width}.{precision}f}'
'    30    '

Upvotes: 3

martineau
martineau

Reputation: 123473

Here's one way to do it the will work in "old" versions of Python (before 3.6) and will continue to work in it as well:

res = "{:^{width}.{precis}f}".format(29.8245, precis=2, width=15)
print(repr(res))

As you can see, format string syntax supports nesting.

Output:

'     29.82     '

The values used for precis and width are expressions, so could involve calculations rather than being hardcoded constants as shown.

Upvotes: 1

avayert
avayert

Reputation: 684

Here is another possible solution that doesn't rely on f-strings

>>> '{0:^{width}.{precision}f}'.format(12.34, width=10, precision=0)
'    12    '

Upvotes: 1

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