如何对Python列表元素首尾去除'-'和'''？代码功能补充求助

Got it, let's sort this out step by step. First, I spotted a critical issue in your original code: after splitting the text into a list of words with split(), you tried calling replace() directly on lines—but lists don't have a replace() method (that's a string method). That would throw an error immediately, so we need to fix that first.

For your actual requirement—stripping only the leading and trailing - and ' characters from each word while keeping those symbols (and others) in the middle—Python's str.strip() method is exactly what you need. It lets you specify a set of characters to remove exclusively from the start and end of a string.

Revised Code #

# Use a context manager to safely open/read the file (auto-closes when done)
with open(file, "r") as readfile:
    # Read text, convert to lowercase, split into individual words
    lines = readfile.read().lower().split()

# Process each word: strip only leading/trailing '-' and "'", leave middle symbols intact
processed_lines = [word.strip("'-") for word in lines]

How This Works #

• Context Manager (with open(...)): This is better practice than manually opening/closing files—it ensures the file is properly closed even if an error occurs.
• strip("'-"): This method removes any combination of - and ' from the start and end of each word. Here's how it handles your examples:
  • "-hi-" → "hi" (both leading and trailing - are removed)
  • "'hi" → "hi" (leading ' is removed)
  • "safety-dance" → "safety-dance" (the - is in the middle, so it stays)
  • "i'll" → "i'll" (the ' is in the middle, so it stays)

If you still need to remove other special characters (like the ones in your original elements string) but only after stripping the -/', you could add an extra step—but based on your examples, it sounds like you want to preserve all middle symbols, so this code should fit your needs perfectly.

内容的提问来源于stack exchange，提问作者guide