Python列表：使用for循环、replace函数替换元素并统计次数求助

Got it, let's build a Python script that checks all your boxes—using a for loop, the replace() function, counting replacements, and showing both original and modified lists. Here's the code:

# Define the original list as specified
original_list = ["blue", "red", "yellow", "green", "red", "black", "white", "gray", "blue", "blue", "red"]

# Get user input for target and replacement words
target_word = input("Enter the target word: ")
replace_word = input("Enter the replacement word: ")

# Initialize empty list for modified words and counter for replacements
modified_list = []
replace_count = 0

# Iterate through each word in the original list
for word in original_list:
    # Use replace() to substitute target with replacement (works even for exact matches)
    new_word = word.replace(target_word, replace_word)
    modified_list.append(new_word)
    # Increment count only if the original word was the target (since replace changed it)
    if word == target_word:
        replace_count += 1

# Output the results in the requested format
print("Original list:", ", ".join(original_list))
print(f"Replaced {replace_count} times")
print("Modified list:", ", ".join(modified_list))

How it works: #

• Original List: We start with the exact list you provided.
• User Input: The script asks for your target and replacement words (e.g., "red" and "pink").
• For Loop & Replace: For each word in the list, we use replace() to swap the target word with the replacement. Since each element is a single word, replace() will either change it (if it's the target) or leave it as-is.
• Counting Replacements: We check if the original word matched the target each time—if yes, we increment our counter to track how many times the swap happened.
• Output: We print the original list, the number of replacements, and the modified list in the comma-separated format you want.

Example Output: #

If you input red as the target and pink as the replacement, you'll get:

Original list: blue, red, yellow, green, red, black, white, gray, blue, blue, red
Replaced 3 times
Modified list: blue, pink, yellow, green, pink, black, white, gray, blue, blue, pink

内容的提问来源于stack exchange，提问作者MikeVita4