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Python | Add comma between numbers

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  • Difficulty Level : Easy
  • Last Updated : 01 Jul, 2019
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Sometimes, while working with currencies, we need to put commas between numbers to represent a currency, hence given a string, we can have a problem to insert commas into them. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using str.format()
The string format function can be used by supplying the valid formatter to perform the formatting. The string formatter is called with the value as argument to perform this particular task.




# Python3 code to demonstrate working of
# Adding comma between numbers
# Using str.format()
  
# initializing number
test_num = 1234567
  
# printing original number 
print("The original number is : " + str(test_num))
  
# Using str.format()
# Adding comma between numbers
res = ('{:, }'.format(test_num))
  
# printing result 
print("The number after inserting commas : " + str(res))

Output :

The original number is : 1234567
The number after inserting commas : 1, 234, 567

 

Method #2 : Using format()
This task can also be performed without taking the help of format library of strings but the normal format library that can use the “d” notation of numbers and simply insert the commas where required.




# Python3 code to demonstrate working of
# Adding comma between numbers
# Using format()
  
# initializing number
test_num = 1234567
  
# printing original number 
print("The original number is : " + str(test_num))
  
# Using format()
# Adding comma between numbers
res = (format (test_num, ', d'))
  
# printing result 
print("The number after inserting commas : " + str(res))

Output :

The original number is : 1234567
The number after inserting commas : 1, 234, 567

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