Python string_scramble函数实现需求：提取两字符串共有小写无重复字符

Got it, let's tackle this problem step by step to build the string_scramble function that meets your requirements!

First, let's recap what we need this function to do clearly:

• Accept two input strings
• Find all characters that appear in both strings
• Convert all matching characters to lowercase
• Return them as a list with no duplicate entries

Final Working Implementation #

Here's a clean, efficient version of the function that checks all the boxes:

def string_scramble(string_one, string_two):
    # Convert both inputs to lowercase to handle case insensitivity
    lower_str1 = string_one.lower()
    lower_str2 = string_two.lower()
    
    # Use set intersection to find shared characters (sets auto-remove duplicates)
    common_chars = set(lower_str1) & set(lower_str2)
    
    # Convert the set to a sorted list (matches the ordered example output)
    # Skip sorted() if you don't need alphabetical order
    return sorted(list(common_chars))

Test It With Your Example #

If we run the sample input:

print(string_scramble('GraSS', 'grilled cheese'))

We get the expected result:

['g', 'r', 's']

Breakdown of Key Choices #

• Lowercasing first: Using .lower() ensures characters like 'G' and 'g' are treated as identical, which is essential for case-insensitive matching.
• Set intersection: Sets are perfect here because they automatically eliminate duplicates, and the & operator gives us an easy way to find common elements between the two strings.
• Sorted output: The sorted() function aligns the result with the sample's ordered list. If the problem didn't specify order, you could just return list(common_chars) instead.

Fixing the Original Snippet's Issues #

The reference code you shared had two main flaws:

1. It hardcoded input strings instead of using the function's parameters
2. It printed characters instead of returning them as a list
   The implementation above fixes both of these while adding the necessary case handling.

内容的提问来源于stack exchange，提问作者Colby Fugate