How do you write percentages in python?

this is my code:

print str[float[1/3]]+'%'

and it shows:

0.0%

but I want to get 33%

What can I do?

martineau

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asked Mar 15, 2011 at 2:10

3

format supports a percentage floating point precision type:

>>> print "{0:.0%}".format[1./3]
33%

If you don't want integer division, you can import Python3's division from __future__:

>>> from __future__ import division
>>> 1 / 3
0.3333333333333333

# The above 33% example would could now be written without the explicit
# float conversion:
>>> print "{0:.0f}%".format[1/3 * 100]
33%

# Or even shorter using the format mini language:
>>> print "{:.0%}".format[1/3]
33%

maxymoo

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answered Mar 15, 2011 at 2:16

mikumiku

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7

There is a way more convenient 'percent'-formatting option for the .format[] format method:

>>> '{:.1%}'.format[1/3.0]
'33.3%'

answered May 20, 2014 at 16:00

5

Just for the sake of completeness, since I noticed no one suggested this simple approach:

>>> print["%.0f%%" % [100 * 1.0/3]]
33%

Details:

• %.0f stands for "print a float with 0 decimal places", so %.2f would print 33.33
• %% prints a literal %. A bit cleaner than your original +'%'
• 1.0 instead of 1 takes care of coercing the division to float, so no more 0.0

answered Aug 15, 2013 at 10:52

MestreLionMestreLion

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6

Just to add Python 3 f-string solution

prob = 1.0/3.0
print[f"{prob:.0%}"]

answered Sep 24, 2019 at 21:48

menrfamenrfa

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4

You are dividing integers then converting to float. Divide by floats instead.

As a bonus, use the awesome string formatting methods described here: //docs.python.org/library/string.html#format-specification-mini-language

To specify a percent conversion and precision.

>>> float[1] / float[3]
[Out] 0.33333333333333331

>>> 1.0/3.0
[Out] 0.33333333333333331

>>> '{0:.0%}'.format[1.0/3.0] # use string formatting to specify precision
[Out] '33%'

>>> '{percent:.2%}'.format[percent=1.0/3.0]
[Out] '33.33%'

A great gem!

answered Mar 15, 2011 at 2:16

Then you'd want to do this instead:

print str[int[1.0/3.0*100]]+'%'

The .0 denotes them as floats and int[] rounds them to integers afterwards again.

answered Mar 15, 2011 at 2:16

3

I use this

ratio = round[1/3, 2] 
print[f"{ratio} %"]

output: 0.33 %

answered Aug 19, 2021 at 8:16

DGKangDGKang

16112 bronze badges

1

this is what i did to get it working, worked like a charm

divideing = a / b
percentage = divideing * 100
print[str[float[percentage]]+"%"]

answered Jul 11 at 20:59

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