Limit Float number to n decimals in Python with example

Limit Float number to n decimals in Python with example

This tutorial explains multiple ways to limit a decimal in a string or floating number with an example

Python Limit floating number with 2 decimals only

  • use template string format from the 3.6 version {:.2f} is a template format used to limit the floating number to 2 decimals.

The format function takes a number, and converts it to a string.

You can convert string to float using the float function

number=1243.997895
number1=1243.12345
number2=1243.1111111997895


print(float("{:.2f}".format(number)))
print(float("{:.2f}".format(number1)))
print(float("{:.2f}".format(number2)))
  • Round function in 2.7 version

round function takes a floating number, and number to tell about the limit the decimal places.

round(floatno, limitdecimal)

if number is a string that contains a float number, first convert it into float

str="123.43123123"
print(round(float(str),3))

Here is an example

number=1243.997895
print(round(number,3))

number1=1243.12345
print(round(number1,3))

number2=1243.1111111997895
print(round(number2,3))

Output:

1243.998
1243.123
1243.111
  • using the print format function

This is the old way of writing and print float values are limited to display

number=1243.997895
number1=1243.12345
number2=1243.1111111997895

print( "%.2f" % number)
print( "%.2f" % number1)
print( "%.2f" % number2)

1244.00
1243.12
1243.11
  • use the format function

format function takes a floating number and formats the string, converting the string with limit decimals.

you can use the float() function, to take a string and convert it into a float number

print(float(format(number2, '.2f')));

Here is an example

number=1243.997895
number1=1243.12345
number2=1243.1111111997895


print(format(number, '.2f'))
print(format(number1, '.2f'))
print(format(number2, '.2f'))