While working with strings, their prefixes and suffix play an important role in making any decision. For data manipulation tasks, we may need to sometimes, check if a string starts with any of the matching strings. Let’s discuss certain ways in which this task can be performed.
Method #1 : Using filter() + startswith()
The combination of the above function can help to perform this particular task. The filter method is used to check for each word and startswith method tests for the prefix logic at target list.
# Python3 code to demonstrate # Prefix tests in Strings # using filter() + startswith() # initializing string test_string = "GfG is best" # initializing prefix list pref_list = ['best', 'GfG', 'good'] # printing original string print("The original string : " + str(test_string)) # using filter() + startswith() # Prefix tests in Strings res = list(filter(test_string.startswith, pref_list)) != [] # print result print("Does string start with any prefix list sublist ? : " + str(res)) |
The original string : GfG is best Does string start with any prefix list sublist ? : True
Method #2 : Using startswith()
As improvement to the above method, it is not always necessary to include filter method for comparison. This task can be handled solely by supplying a prefix check list as argument to startswith method as well.
# Python3 code to demonstrate # Prefix tests in Strings # using startswith() # initializing string test_string = "GfG is best" # initializing prefix list pref_list = ['best', 'GfG', 'good'] # printing original string print("The original string : " + str(test_string)) # using startswith() # Prefix tests in Strings res = test_string.startswith(tuple(pref_list)) # print result print("Does string start with any prefix list sublist ? : " + str(res)) |
The original string : GfG is best Does string start with any prefix list sublist ? : True
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