CODEWITHSUNDEEP
python
zjm1126
zjm1126

Reputation: 35680

How to print a percentage value?

Given a float between 0 and 1, how to print it as a percentage?

For example, 1/3 should print as 33%.

Upvotes: 294

Views: 621747

Answers (8)

miku
miku

Reputation: 188164

Since Python 3.0, str.format and format support a percentage presentation type:

>>> f"{1/3:.0%}"
'33%'
>>> "{:.0%}".format(1/3)
'33%'
>>> format(1/3, ".0%")
'33%'

Percentage. Multiplies the number by 100 and displays in fixed ('f') format, followed by a percent sign.

The .0 part of the format spec .0% indicates that you want zero digits of precision after the decimal point, because with f"{1/3:%}" you would get the string '33.333333%'.

It works with integers, floats, and decimals. See PEP 3101.

Upvotes: 433

menrfa
menrfa

Reputation: 1667

Just to add Python 3 f-string solution

prob = 1.0/3.0
print(f"{prob:.0%}")  # 33%
print(f"{prob:.2%}")  # 33.33%

Upvotes: 101

ItsInhaleYo
ItsInhaleYo

Reputation: 29

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

divideing = a / b
percentage = divideing * 100
print(str(float(percentage))+"%")

Upvotes: -1

DGKang
DGKang

Reputation: 172

I use this

ratio = round(1/3, 2) 
print(f"{ratio} %")

output: 0.33 %

Upvotes: 1

MestreLion
MestreLion

Reputation: 13726

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

Upvotes: 95

user2489252
user2489252

Reputation:

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

>>> '{:.1%}'.format(1/3.0)
'33.3%'

Upvotes: 225

Morten Kristensen
Morten Kristensen

Reputation: 7623

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.

Upvotes: 4

Yuji 'Tomita' Tomita
Yuji 'Tomita' Tomita

Reputation: 118528

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

As a bonus, use the awesome string formatting methods described here: http://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!

Upvotes: 42

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