Skip to content
Related Articles

Related Articles

Improve Article
Python – Character coordinates in Matrix
  • Last Updated : 30 Dec, 2020

Sometimes, while working with Python data, we can have a problem in which we need to extract all the coordinates in Matrix, which are characters. This kind of problem can have potential application in domains such as web development and day-day programming. Let’s discuss certain ways in which this task can be performed.

Input : test_list = [‘1G’, ’12F’, ‘231G’]
Output : [(0, 1), (1, 2), (2, 3)]

Input : test_list = [‘G’, ‘F’, ‘G’]
Output : [(0, 0), (1, 0), (2, 0)]

Method #1 : Using enumerate() + list comprehension + isalpha()
The combination of above functions can be used to solve this problem. In this, we perform the task of working with indices using enumerate and characters filtering is done using isalpha().




# Python3 code to demonstrate working of 
# Character coordinates in Matrix
# Using enumerate() + list comprehension + isalpha()
          
# initializing list
test_list = ['23f45.;4d', '5678d56d', '789', '5678g']
  
# printing original list
print("The original list is : " + str(test_list))
  
# Character coordinates in Matrix
# Using enumerate() + list comprehension + isalpha()
res = [(x, y) for x, val in enumerate(test_list) 
        for y, chr in enumerate(val) if chr.isalpha()]  
  
# printing result 
print("Character indices : " + str(res)) 
Output :



The original list is : ['23f45.;4d', '5678d56d', '789', '5678g']
Character indices : [(0, 2), (0, 8), (1, 4), (1, 7), (3, 4)]

 

Method #2 : Using regex() + loop
The combination of above functions can be used to solve this problem. In this, we perform task of filtering alphabets using regex expressions. Just returns the first occurrence of character in each string.




# Python3 code to demonstrate working of 
# Character coordinates in Matrix
# Using regex() + loop
import re
          
# initializing list
test_list = ['23f45.;4d', '5678d56d', '789', '5678g']
  
# printing original list
print("The original list is : " + str(test_list))
  
# Character coordinates in Matrix
# Using regex() + loop
res = []
for key, val in enumerate(test_list):
    temp = re.search('([a-zA-Z]+)', val)
    if temp :
        res.append((key, temp.start()))
          
# printing result 
print("Character indices : " + str(res)) 
Output :
The original list is : ['23f45.;4d', '5678d56d', '789', '5678g']
Character indices : [(0, 2), (1, 4), (3, 4)]

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course




My Personal Notes arrow_drop_up
Recommended Articles
Page :