Skip to content
Related Articles

Related Articles

Improve Article

Python | Add only numeric values present in a list

  • Last Updated : 19 Mar, 2019

Given a list containing characters and numbers, the task is to add only numbers from a list. Given below are a few methods to complete a given task.

Method #1: Using filter() and lambda




# Python code to demonstrate
# how to add only numbers present
# in a list of characters and numbers
  
# initialising lists
ini_list = [1, 2, 3, 4, 'a', 'b', 'x', 5, 'z']
  
# printing initial list
print ("initial list", str(ini_list))
  
# code to add numbers from list
res = sum(filter(lambda i: isinstance(i, int), ini_list))
  
# printing result
print ("resultant sum", res)
Output:
initial list [1, 2, 3, 4, 'a', 'b', 'x', 5, 'z']
resultant sum 15

 
Method #2: Using try and except




# Python code to demonstrate
# how to add only numbers present
# in a list of characters and numbers
  
# initialising lists
ini_list = [1, 2, 3, 4, 'a', 'b', 'x', 5, 'z']
  
# printing initial list
print ("initial list", str(ini_list))
  
# code to add numbers from list
res = 0
for item in ini_list:
    try:
        res+= int(item)
    except ValueError:
        pass
  
# printing result
print ("resultant sum", res)
Output:
initial list [1, 2, 3, 4, 'a', 'b', 'x', 5, 'z']
resultant sum 15

 
Method #3: Using isinstance and conditional statements






# Python code to demonstrate
# how to add only numbers present
# in a list of characters and numbers
  
# initialising lists
ini_list = [1, 2, 3, 4, 'a', 'b', 'x', 5, 'z']
  
# printing initial list
print ("initial list", str(ini_list))
  
# code to add numbers from list
res = sum([x for x in ini_list if isinstance(x, int)])
  
# printing result
print ("resultant sum", res)
Output:
initial list [1, 2, 3, 4, 'a', 'b', 'x', 5, 'z']
resultant sum 15

 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 :