4.2

4.2作业.py

@@ -0,0 +1,15 @@
+import re
+
+phone_book = '''
+张三：138-1999-9101
+李四：139-1998-5678
+王五：138-1997-1234
+'''
+
+pattern = r'(\d{3})-(\d{4})-(\d{4})'
+
+def mask_phone(match):
+    return f'{match.group(1)}-****-{match.group(3)}'
+
+masked = re.sub(pattern, mask_phone, phone_book)
+print(masked)