使用Python split()方法为何会导致字符串内容发生变化？

Hey there! I’ve run into this exact kind of issue before—let’s break down what’s happening here.

The Real Issue: Sneaky Lookalike Characters #

Your problem isn’t with the split() method itself—it’s with hidden character differences in your original string. Take a close look at the word you think is "April" after "before ": it’s actually Арril, not April.

Here’s the breakdown of the tricky characters:

• The first character is a Cyrillic А (Unicode U+0410), not the English A (U+0041)
• The second character is a Cyrillic р (Unicode U+0440), not the English r (U+0072)
• Even other characters like у, е, а, о scattered in the string are Cyrillic lookalikes instead of standard English letters

When you call split('before '), Python is correctly splitting on the English "before " sequence—but the text after it uses these Cyrillic doppelgängers, which look almost identical to English letters but are completely different characters under the hood. That’s why the split result looks like it’s "altered" or truncated—it’s just displaying these non-English characters you didn’t expect.

Let’s Prove It #

Run this quick snippet to see the Unicode codes of the characters in question:

test_str = "Question: The cryptocurrency Bitcoin Cash (BCH/USD) settled at 1368 USD at 07:00 AM UTC at the Bitfinex exchange on Monday, April 23. In your opinion, will BCH/USD trade above 1500 USD (+9.65%) at anу timе bеfore Арril 28? Indicаtоr: 60.76%"
# Grab the part after "before "
post_split = test_str.split('before ')[1]
# Print each character and its Unicode code
print("Characters after 'before ' (with Unicode):")
for char in post_split[:6]:
    print(f"'{char}' → U+{ord(char):04X}")

You’ll see that the first two characters of "Арril" are U+0410 and U+0440, while the real English "April" starts with U+0041 and U+0072—total different characters!

How to Fix This #

If you want to split the string as intended (around the English "April"), first replace those Cyrillic lookalikes with their English counterparts:

# Map Cyrillic lookalikes to English characters
char_map = {
    'А': 'A', 'р': 'r', 'у': 'u',
    'е': 'e', 'а': 'a', 'о': 'o'
}
# Replace each problematic character
fixed_str = test_str
for cyrillic, english in char_map.items():
    fixed_str = fixed_str.replace(cyrillic, english)
# Now split as expected
split_result = fixed_str.split('before ')
print(split_result)

This will give you the clean split you were expecting, with no weird "altered" text.

内容的提问来源于stack exchange，提问作者Serge Ballesta