CODEWITHSUNDEEP
python
Mr_Shoryuken
Mr_Shoryuken

Reputation: 833

How to convert int to float in python?

Does anyone know how to convert int to float.

For some reason, it keeps on printing 0. I want it to print a specific decimal.

sum = 144
women_onboard = 314
proportion_womenclass3_survived = sum / np.size(women_onboard)
print 'Proportion of women in class3 who survived is %s' % proportion_womenclass3_survived

See also: How can I force division to be floating point? Division keeps rounding down to 0? for the underlying problem. Doing the conversion is the natural way to avoid this problem, but there are also other reasons why such conversion might be necessary.

Upvotes: 41

Views: 192381

Answers (6)

Prateek Gupta
Prateek Gupta

Reputation: 2760

The answers provided above are absolutely correct and worth to read but I just wanted to give a straight forward answer to the question.

The question asked is just a type conversion question and here its conversion from int data type to float data type and for that you can do it by the function :

float()

And for more details you can visit this page.

Upvotes: 1

nvim_
nvim_

Reputation: 73

You can literally convert it into float using:


float_value = float(integer_value)

Likewise, you can convert an integer back to float datatype with:


integer_value = int(float_value)

Hope it helped. I advice you to read "Build-In Functions of Python" at this link: https://docs.python.org/2/library/functions.html

Upvotes: 5

Y2H
Y2H

Reputation: 2537

To convert an integer to a float in Python you can use the following:

float_version = float(int_version)

The reason you are getting 0 is that Python 2 returns an integer if the mathematical operation (here a division) is between two integers. So while the division of 144 by 314 is 0.45~~~, Python converts this to integer and returns just the 0 by eliminating all numbers after the decimal point.

Alternatively you can convert one of the numbers in any operation to a float since an operation between a float and an integer would return a float. In your case you could write float(144)/314 or 144/float(314). Another, less generic code, is to say 144.0/314. Here 144.0 is a float so it’s the same thing.

Upvotes: 57

Sourabh Dattawad
Sourabh Dattawad

Reputation: 59

You can just multiply 1.0

>>> 1.0*144/314
0.4585987261146497

Upvotes: 5

John Ruddell
John Ruddell

Reputation: 25842

In Python 3 this is the default behavior, but if you aren't using that you can import division like so:

>>> from __future__ import division
>>> 144/314
0.4585987261146497

Alternatively you can cast one of the variables to a float when doing your division which will do the same thing

sum = 144
women_onboard = 314
proportion_womenclass3_survived = sum / float(np.size(women_onboard))

Upvotes: 6

Santosh Kumar
Santosh Kumar

Reputation: 27875

Other than John's answer, you could also make one of the variable float, and the result will yield float.

>>> 144 / 314.0
0.4585987261146497

Upvotes: 18

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