Python | Remove prefix strings from list

Sometimes, while working with data, we can have a problem in which we need to filter the strings list in such a way that strings starting with specific prefix are removed. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop + remove() + startswith()
The combination of above functions can solve this problem. In this, we remove the elements that start with particular prefix accessed using loop and return the modified list.

# Python3 code to demonstrate working of 
# Remove prefix strings from list 
# using loop + remove() + startswith() 
  
# initialize list  
test_list = ['xall', 'xlove', 'gfg', 'xit', 'is', 'best'] 
  
# printing original list  
print("The original list : " + str(test_list)) 
  
# initialize prefix  
pref = 'x'
  
# Remove prefix strings from list 
# using loop + remove() + startswith() 
for word in test_list[:]: 
    if word.startswith(pref): 
        test_list.remove(word) 
  
# printing result 
print("List after removal of Kth character of each string : " + str(test_list)) 

Output :

The original list : ['xall', 'xlove', 'gfg', 'xit', 'is', 'best']
List after removal of Kth character of each string : ['gfg', 'is', 'best']

Method #2 : Using list comprehension + startswith()
This is another way in which this task can be performed. In this, we don’t perform removal in place, instead, we recreate the list without the elements that match the prefix.

# Python3 code to demonstrate working of 
# Remove prefix strings from list 
# using list comprehension + startswith() 
  
# initialize list  
test_list = ['xall', 'xlove', 'gfg', 'xit', 'is', 'best'] 
  
# printing original list  
print("The original list : " + str(test_list)) 
  
# initialize prefix  
pref = 'x'
  
# Remove prefix strings from list 
# using list comprehension + startswith() 
res = [ele for ele in test_list if not ele.startswith(pref)] 
  
# printing result 
print("List after removal of Kth character of each string : " + str(res)) 

Output :

The original list : ['xall', 'xlove', 'gfg', 'xit', 'is', 'best']
List after removal of Kth character of each string : ['gfg', 'is', 'best']

My Personal Notes

Recommended Posts: