CODEWITHSUNDEEP
pythonformat
zaydar
zaydar

Reputation: 181

Converting from float to percentage

I would like to convert a decimal number (say 0.33333) to percentage (expected answer 33.33%)

I used the following

x = 0.3333

print(format(x,'.2%'))

which gives indeed 33.33%

However, the result is a string, I would like it to still be a number (in % format) to be able to perform mathematical operations on it (e.g. format(x,'.2%')*2 to give 66.66%

But this throws an exception as 33.33% is a string

Upvotes: 5

Views: 24910

Answers (4)

vtnate
vtnate

Reputation: 163

Use f-strings! (python >= 3.6)

x = 0.3333

print(f"{x:,.2%}")

That is: print x, to 2 decimal places, and add the % symbol at the end. x is not altered by the f-string. Add the percent-symbol at the very end. Meaning, do your math with x first, then display it however you want with the f-string.

Upvotes: 1

DToelkes
DToelkes

Reputation: 51

x = 0.3333

print('{:,.2%}'.format(x))  # Prints percentage format, retains x as float variable

Output:

33.33%

Upvotes: 4

VitorGRM
VitorGRM

Reputation: 11

I made it on a single line like:

x = 0.333
print(str(int(x*100)) + "%)

Upvotes: 1

Mehdi
Mehdi

Reputation: 1360

An idea is to create a custom datatype, I'll call it Percent, which inherit everything from float, but when you want to use it as a string it shows a % and multiplies the number with 100.

class Percent(float):
    def __str__(self):
        return '{:.2%}'.format(self)
x = Percent(0.3333)
print(x)
# 33.33%

If you want to represnt the value in envoirment like jupyter notebook in your format you can add same method with the name __repr__ to Percent Class:

def __repr__(self):
    return '{:.2%}'.format(self)

Upvotes: 7

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