Python: Single digits in numbers sorted backwards and converted to English words

Last update on May 30 2025 11:49:15 (UTC/GMT +8 hours)

Single Digits to English Words in Reverse Order

Write a Python program to get the single digits in numbers sorted backwards and converted into English words.

Input: 
[1, 3, 4, 5, 11]
Output:
['five', 'four', 'three', 'one']

Input: 
[27, 3, 8, 5, 1, 31]
Output:
['eight', 'five', 'three', 'one']

Visual Presentation:

Sample Solution:

Python Code:

# License: https://bit.ly/3oLErEI

# Function to convert single-digit numbers in a list to English words,
# sort them backwards, and return the result
def test(nums):
    # Dictionary mapping English words to their corresponding digits
    digits = {
        "zero": None,
        "one": 1,
        "two": 2,
        "three": 3,
        "four": 4,
        "five": 5,
        "six": 6,
        "seven": 7,
        "eight": 8,
        "nine": 9
    }
    
    # Create a reverse dictionary mapping digits to their corresponding English words
    digits_backwards = {digits[k]: k for k in digits}
    
    # Convert the original dictionary values to a list
    digits = [digits[s] for s in digits]
    
    # Extract single-digit numbers from the input list and convert them to English words
    li = [digits[n] for n in nums if n in digits]
    
    # Return the sorted list of English words corresponding to the digits
    return [digits_backwards[n] for n in sorted(li, reverse=True)]

# Test cases with different lists of numbers
nums = [1, 3, 4, 5, 11]
print("Original list of numbers:")
print(nums)
print("Return the single digits in nums sorted backwards and converted to English words:")
print(test(nums))

nums = [27, 3, 8, 5, 1, 31]
print("\nOriginal list of numbers:")
print(nums)
print("Return the single digits in nums sorted backwards and converted to English words:")
print(test(nums))

Sample Output:

Original list of numbers:
[1, 3, 4, 5, 11]
Return the single digits in nums sorted backwards and converted to English words:
['five', 'four', 'three', 'one']

Original list of numbers:
[27, 3, 8, 5, 1, 31]
Return the single digits in nums sorted backwards and converted to English words:
['eight', 'five', 'three', 'one']

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to convert single-digit numbers in a list to their English words and then output the words in reverse order.
• Write a Python program to map each digit from a list to its English name, remove duplicates, and reverse the order of the resulting list.
• Write a Python program to use a dictionary mapping to convert single digits to words and then reverse the sequence of these words.
• Write a Python program to extract single-digit numbers, translate them into English words, and return the reversed order of the resulting words.

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