Prefix frequency in string List - Python Last Updated : 05 Dec, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report In this article, we will explore various methods to find prefix frequency in string List. The simplest way to do is by using a loop.Using a LoopOne of the simplest ways to calculate the frequency of a prefix in a list of strings is by iterating through each element and checking if the string starts with the given prefix. Python a = ["geeks", "geeksforgeeks", "geeky", "geek", "apple", "banana"] # Prefix to match prefix = "geeks" # Initialize count count = 0 # Loop through the list and check # if each word starts with the given prefix for word in a: if word.startswith(prefix): count += 1 print(f"The prefix '{prefix}' appears {count} times.") OutputThe prefix 'geeks' appears 2 times. Explanation:word.startswith(prefix): Checks if each word starts with the given prefix.count: Tracks how many words start with the specified prefix.Using List ComprehensionList comprehension is a more compact and Pythonic way to solve this problem we can implement the above method in a single line. Python a = ["geeks", "geeksforgeeks", "geeky", "geek", "apple", "banana"] # Prefix to match prefix = "geeks" # Using list comprehension to count # words starting with the given prefix count = len([word for word in a if word.startswith(prefix)]) print(f"The prefix '{prefix}' appears {count} times.") OutputThe prefix 'geeks' appears 2 times. Explanation:List comprehension iterates through each word in the list and checks if it starts with the given prefix.len() calculates the length of the filtered list results in count of words that match.Using filter()The filter() function can filter strings starting with the prefix, then we are counting the filtered results using len() method. Python a = ["geeks", "geeksforgeeks", "geeky", "geek", "apple", "banana"] # Prefix to match prefix = "geeks" # Using filter to count words starting with the given prefix count = len(list(filter(lambda word: word.startswith(prefix), a))) print(f"The prefix '{prefix}' appears {count} times.") OutputThe prefix 'geeks' appears 2 times. Using collections.Counter() To calculate the frequency of multiple prefixes, we can use Counter for efficient counting. Python from collections import Counter a = ["geeks", "geeksforgeeks", "geeky", "geek", "apple", "banana"] # Prefix to match prefix = "geeks" # Count all prefixes in the list prefixes = [word[:len(prefix)] for word in a] # Extract the prefixes prefix_count = Counter(prefixes) # Get the count for the desired prefix count = prefix_count[prefix] print(f"The prefix '{prefix}' appears {count} times.") OutputThe prefix 'geeks' appears 2 times. Comment More infoAdvertise with us Next Article Prefix frequency in string List - Python M manjeet_04 Follow Improve Article Tags : Python Python Programs Python list-programs Practice Tags : python Similar Reads Create a List of Strings in Python Creating a list of strings in Python is easy and helps in managing collections of text. For example, if we have names of people in a group, we can store them in a list. We can create a list of strings by using Square Brackets [] . We just need to type the strings inside the brackets and separate the 3 min read Python | Append suffix/prefix to strings in list Sometimes, while working with Python, we can a problem in which we need to pad strings in lists at trailing or leading position. This kind of problem is quite common and can occur in day-day programming or web development. Let's discuss a way in which this task can be performed. Method #1: Using + o 5 min read 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 a specific prefix are removed. Let's discuss certain ways in which this task can be performed. Method #1 : Using loop + remove() + startswith() The combinati 5 min read List of strings in Python A list of strings in Python stores multiple strings together. In this article, we’ll explore how to create, modify and work with lists of strings using simple examples.Creating a List of StringsWe can use square brackets [] and separate each string with a comma to create a list of strings.Pythona = 2 min read Python program to find String in a List Searching for a string in a list is a common operation in Python. Whether we're dealing with small lists or large datasets, knowing how to efficiently search for strings can save both time and effort. In this article, we’ll explore several methods to find a string in a list, starting from the most e 3 min read Like