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Python | Convert numeric words to numbers

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  • Difficulty Level : Medium
  • Last Updated : 08 Sep, 2022
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Sometimes, while working with python Strings, we can have a problem in which we need to convert the strings that are in form of named numbers to actual numbers. This has applications in Mathematical domains and Data Science domains. Let us discuss certain ways in which this task can be performed. 

Method #1: Using loop + join() + split() One of the ways to solve this problem is to use a map, where one can map the numeric with words and then split the strings and rejoin using mapping to numbers. 

Python3




# Python3 code to demonstrate working of
# Convert numeric words to numbers
# Using join() + split()
 
help_dict = {
    'one': '1',
    'two': '2',
    'three': '3',
    'four': '4',
    'five': '5',
    'six': '6',
    'seven': '7',
    'eight': '8',
    'nine': '9',
    'zero': '0'
}
 
# initializing string
test_str = "zero four zero one"
 
# printing original string
print("The original string is : " + test_str)
 
# Convert numeric words to numbers
# Using join() + split()
res = ''.join(help_dict[ele] for ele in test_str.split())
 
# printing result
print("The string after performing replace : " + res)

Output : 

The original string is : zero four zero one
The string after performing replace : 0401

Method #2: Using word2number library This problem can also be solved using PyPI library word2number. It has inbuilt functions that convert words to numbers. 

Python3




# Python3 code to demonstrate working of
# Convert numeric words to numbers
# Using word2number
from word2number import w2n
 
# initializing string
test_str = "zero four zero one"
 
# printing original string
print("The original string is : " + test_str)
 
# Convert numeric words to numbers
# Using word2number
res = w2n.word_to_num(test_str)
 
# printing result
print("The string after performing replace : " + str(res))

Output : 

The original string is : zero four zero one
The string after performing replace : 0401

Time Complexity: O(n)

Auxiliary Space: O(n)


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