Python – Remove strings with any non-required character
Given a Strings list, remove string, if it contains any unwanted character.
Input : test_list = [“gfg”, “is”, “best”, “for”, “geeks”], chr_list = [‘f’, ‘m’, ‘n’, ‘i’]
Output : [‘best’, ‘geeks’]
Explanation : Given Strings don’t contain f, m, n or i.Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.
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Input : test_list = [“gfg”, “is”, “best”, “for”, “geeks”], chr_list = [‘f’, ‘m’, ‘n’]
Output : [‘best’, ‘geeks’, ‘is’]
Explanation : Given Strings don’t contain f, m or n.
Method #1 : Using list comprehension + any()
In this, we test all strings and use any() to iterate all the non-required characters list and check its presence in string, if found, that list is not included in result list.
Python3
# Python3 code to demonstrate working of# Remove strings with any non-required character# Using list comprehension + any() # initializing listtest_list = ["gfg", "is", "best", "for", "geeks"] # printing original listprint("The original list is : " + str(test_list)) # non-required char listchr_list = ['f', 'm', 'n', 'i'] # checking for all strings# removing if contains even 1 characterres = [sub for sub in test_list if not any(ele in sub for ele in chr_list)] # printing resultprint("Filtered Strings : " + str(res)) |
The original list is : ['gfg', 'is', 'best', 'for', 'geeks'] Filtered Strings : ['best', 'geeks']
Method #2 : Using filter() + lambda + any()
In this, we perform task of filtering using filter() and lambda function. Rest any() is used to check for any character present in strings for its removal.
Python3
# Python3 code to demonstrate working of# Remove strings with any non-required character# Using filter() + lambda + any() # initializing listtest_list = ["gfg", "is", "best", "for", "geeks"] # printing original listprint("The original list is : " + str(test_list)) # non-required char listchr_list = ['f', 'm', 'n', 'i'] # checking for all strings# filter and lambda used to do this taskres = list(filter(lambda sub: not any( ele in sub for ele in chr_list), test_list)) # printing resultprint("Filtered Strings : " + str(res)) |
The original list is : ['gfg', 'is', 'best', 'for', 'geeks'] Filtered Strings : ['best', 'geeks']
