Sort list of strings by a part of the string in python

Sort list of strings by a part of the string in python

To sort a list of strings by a specific part of each string in Python, you can use the sorted() function and provide a custom sorting key function using a lambda function or a regular function. The key function should extract the part of the string that you want to use for sorting. Here's how you can do it:

# Example list of strings my_list = ["apple_banana", "orange_cherry", "grape_apple", "banana_orange"] # Sort the list based on the substring after the underscore sorted_list = sorted(my_list, key=lambda s: s.split('_')[1]) # Print the sorted list print(sorted_list)

In this example, we sort the list of strings based on the substring that appears after the underscore ('_') in each string. The key argument in the sorted() function specifies a lambda function that extracts the relevant part of each string for comparison.

The output will be:

['banana_orange', 'apple_banana', 'orange_cherry', 'grape_apple']

You can replace the lambda function with a regular function if you prefer:

def get_part_to_sort(s): return s.split('_')[1] sorted_list = sorted(my_list, key=get_part_to_sort)

This approach allows you to sort the list of strings based on a specific part of each string, defined by your key function.

Examples

  1. How to sort a list of strings by a specific substring in Python?

    • Description: This query focuses on sorting a list of strings by a specific part or substring within each string.
    • Code:
      # List of strings data = ["file_001.txt", "file_010.txt", "file_002.txt", "file_003.txt"] # Sort by the numeric part after 'file_' sorted_by_substring = sorted(data, key=lambda x: int(x.split('_')[1].split('.')[0])) print(sorted_by_substring)

  2. How to sort a list of strings by the last part in Python?

    • Description: This query demonstrates sorting a list of strings by the last part or segment.
    • Code:
      # List of strings data = ["apple pie", "banana split", "cherry tart"] # Sort by the last word in each string sorted_by_last_part = sorted(data, key=lambda x: x.split()[-1]) print(sorted_by_last_part)

  3. How to sort a list of strings by a part of the string in descending order in Python?

    • Description: This query involves sorting by a specific part of the string in descending order.
    • Code:
      # Sort by the last word in descending order sorted_by_last_part_desc = sorted(data, key=lambda x: x.split()[-1], reverse=True) print(sorted_by_last_part_desc)

  4. How to sort a list of strings by a specific position in Python?

    • Description: This query demonstrates sorting by a specific position or index in each string.
    • Code:
      # List of strings data = ["apple", "banana", "cherry"] # Sort by the second character sorted_by_position = sorted(data, key=lambda x: x[1]) print(sorted_by_position)

  5. How to sort a list of strings by multiple parts in Python?

    • Description: This query focuses on sorting by multiple parts or segments within each string.
    • Code:
      data = ["12-34", "10-15", "12-10"] # Sort by the first and then the second segment sorted_by_multiple_parts = sorted(data, key=lambda x: (int(x.split('-')[0]), int(x.split('-')[1]))) print(sorted_by_multiple_parts)

  6. How to sort a list of strings by a number within the string in Python?

    • Description: This query demonstrates sorting by a number embedded within the string.
    • Code:
      data = ["item20", "item3", "item100"] # Extract the number and sort by it sorted_by_number = sorted(data, key=lambda x: int(''.join(filter(str.isdigit, x)))) print(sorted_by_number)

  7. How to sort a list of strings by a specific word in Python?

    • Description: This query involves sorting by a specific word or segment within each string.
    • Code:
      data = ["dog jumps over the fence", "cat sleeps on the mat", "bird sings in the tree"] # Sort by the second word sorted_by_word = sorted(data, key=lambda x: x.split()[1]) print(sorted_by_word)

  8. How to sort a list of strings by a substring in a specific position in Python?

    • Description: This query focuses on sorting by a substring from a specific position within each string.
    • Code:
      data = ["apple_123", "banana_456", "cherry_789"] # Sort by the substring after the underscore sorted_by_position = sorted(data, key=lambda x: int(x.split('_')[1])) print(sorted_by_position)

  9. How to sort a list of strings by the first character in Python?

    • Description: This query demonstrates sorting by the first character in each string.
    • Code:
      # Sort by the first character sorted_by_first_char = sorted(data, key=lambda x: x[0]) print(sorted_by_first_char)

  10. How to sort a list of strings by the length of a specific word in Python?

    • Description: This query focuses on sorting by the length of a specific word within each string.
    • Code:
      data = ["dog jumps over the fence", "cat sleeps on the mat", "bird sings in the tree"] # Sort by the length of the first word sorted_by_word_length = sorted(data, key=lambda x: len(x.split()[0])) print(sorted_by_word_length)

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