When it is required to sort a given list of strings based on a numeric part of the string, a method is defined that uses the regular expressions, the ‘map’ method and the ‘list’ method to display the result.
Example
Below is a demonstration of the same −
import re
print("The regular expression package has been imported successfully.")
def my_digit_sort(my_list):
return list(map(int, re.findall(r'\d+', my_list)))[0]
my_list = ["pyt23hon", "fu30n", "lea14rn", 'co00l', 'ob8uje3345t']
print("The list is : " )
print(my_list)
my_list.sort(key=my_digit_sort)
print("The list has been sorted based on the pre-defined method..")
print("The resultant list is : ")
print(my_list)Output
The regular expression package has been imported successfully. The list is : ['pyt23hon', 'fu30n', 'lea14rn', 'co00l', 'ob8uje3345t'] The list has been sorted based on the pre-defined method.. The resultant list is : ['co00l', 'ob8uje3345t', 'lea14rn', 'pyt23hon', 'fu30n']
Explanation
The required packages are imported into the environment.
A method named 'my_digit_sort' is defined and it takes a list as a paramater.
It uses the regular expression and the 'findall' method of the 're' package to find the digits present inside the words.
This is mapped to all elements in the list.
This is converted into a list and is returned as output.
Outside the method, a list of strings that contains integers is defined and displayed on the console.
This list is sorted based on the pre-defined method.
This output is displayed on the console.