<\/span><\/h2>\n\n\n\n\u6700\u7b80\u5355\u7684\u6587\u672c\u5339\u914d\u65b9\u5f0f\u5c31\u662f\u4f7f\u7528 in<\/code> \u5173\u952e\u5b57\uff0c\u68c0\u67e5\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u5305\u542b\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\ntext = \"Hello, world!\"
substring = \"world\"
if substring in text:
print(f\"'{substring}' is found in '{text}'\")
else:
print(f\"'{substring}' is not found in '{text}'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n'world' is found in 'Hello, world!'<\/code><\/pre>\n\n\n\n<\/span>2. \u4f7f\u7528 str.find()<\/code><\/strong><\/span><\/h2>\n\n\n\nstr.find()<\/code> \u65b9\u6cd5\u8fd4\u56de\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u627e\u4e0d\u5230\u5219\u8fd4\u56de -1\u3002<\/p>\n\n\n\ntext = \"Hello, world!\"
substring = \"world\"
index = text.find(substring)
if index != -1:
print(f\"'{substring}' is found at index {index} in '{text}'\")
else:
print(f\"'{substring}' is not found in '{text}'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n'world' is found at index 7 in 'Hello, world!'<\/code><\/pre>\n\n\n\n<\/span>3. \u4f7f\u7528 str.index()<\/code><\/strong><\/span><\/h2>\n\n\n\nstr.index()<\/code> \u65b9\u6cd5\u7c7b\u4f3c\u4e8e str.find()<\/code>\uff0c\u4f46\u5982\u679c\u6ca1\u6709\u627e\u5230\u5b50\u5b57\u7b26\u4e32\uff0c\u5b83\u4f1a\u629b\u51fa\u4e00\u4e2a ValueError<\/code>\u3002<\/p>\n\n\n\ntext = \"Hello, world!\"
substring = \"world\"
try:
index = text.index(substring)
print(f\"'{substring}' is found at index {index} in '{text}'\")
except ValueError:
print(f\"'{substring}' is not found in '{text}'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n'world' is found at index 7 in 'Hello, world!'<\/code><\/pre>\n\n\n\n<\/span>4. \u4f7f\u7528 str.startswith()<\/code><\/strong><\/span><\/h2>\n\n\n\nstr.startswith()<\/code> \u65b9\u6cd5\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u4ee5\u6307\u5b9a\u7684\u524d\u7f00\u5f00\u5934\u3002<\/p>\n\n\n\ntext = \"Hello, world!\"
if text.startswith(\"Hello\"):
print(f\"'{text}' starts with 'Hello'\")
else:
print(f\"'{text}' does not start with 'Hello'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n'Hello, world!' starts with 'Hello'<\/code><\/pre>\n\n\n\n<\/span>5. \u4f7f\u7528 str.endswith()<\/code><\/strong><\/span><\/h2>\n\n\n\nstr.endswith()<\/code> \u65b9\u6cd5\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u4ee5\u6307\u5b9a\u7684\u540e\u7f00\u7ed3\u5c3e\u3002<\/p>\n\n\n\ntext = \"Hello, world!\"
if text.endswith(\"world!\"):
print(f\"'{text}' ends with 'world!'\")
else:
print(f\"'{text}' does not end with 'world!'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n'Hello, world!' ends with 'world!'<\/code><\/pre>\n\n\n\n<\/span>6. \u4f7f\u7528 str.count()<\/code><\/strong><\/span><\/h2>\n\n\n\nstr.count()<\/code> \u65b9\u6cd5\u8fd4\u56de\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n\n\n\ntext = \"Hello, world! Hello, Python!\"
count = text.count(\"Hello\")
print(f\"'Hello' appears {count} times in '{text}'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n'Hello' appears 2 times in 'Hello, world! Hello, Python!'<\/code><\/pre>\n\n\n\n<\/span>7. \u4f7f\u7528 str.replace()<\/code><\/strong><\/span><\/h2>\n\n\n\nstr.replace()<\/code> \u65b9\u6cd5\u7528\u4e8e\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\ntext = \"Hello, world!\"
new_text = text.replace(\"world\", \"Python\")
print(f\"Original: {text}\")
print(f\"Replaced: {new_text}\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\nOriginal: Hello, world!
Replaced: Hello, Python!<\/code><\/pre>\n\n\n\n<\/span>8. \u4f7f\u7528 re<\/code> \u6a21\u5757\u7684\u57fa\u672c\u5339\u914d<\/strong><\/span><\/h2>\n\n\n\nre<\/code> \u6a21\u5757\u63d0\u4f9b\u4e86\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u652f\u6301\uff0c\u53ef\u4ee5\u8fdb\u884c\u66f4\u590d\u6742\u7684\u6587\u672c\u5339\u914d\u3002<\/p>\n\n\n\nimport re
text = \"Hello, world!\"
pattern = r\"world\"
match = re.search(pattern, text)
if match:
print(f\"Pattern '{pattern}' is found in '{text}'\")
else:
print(f\"Pattern '{pattern}' is not found in '{text}'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\nPattern 'world' is found in 'Hello, world!'<\/code><\/pre>\n\n\n\n<\/span>9. \u4f7f\u7528 re.findall()<\/code><\/strong><\/span><\/h2>\n\n\n\nre.findall()<\/code> \u65b9\u6cd5\u8fd4\u56de\u6240\u6709\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\nimport re
text = \"Hello, world! Hello, Python!\"
pattern = r\"Hello\"
matches = re.findall(pattern, text)
print(f\"Pattern '{pattern}' is found {len(matches)} times in '{text}'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\nPattern 'Hello' is found 2 times in 'Hello, world! Hello, Python!'<\/code><\/pre>\n\n\n\n<\/span>10. \u4f7f\u7528 re.sub()<\/code><\/strong><\/span><\/h2>\n\n\n\nre.sub()<\/code> \u65b9\u6cd5\u7528\u4e8e\u66ff\u6362\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\nimport re
text = \"Hello, world!\"
pattern = r\"world\"
replacement = \"Python\"
new_text = re.sub(pattern, replacement, text)
print(f\"Original: {text}\")
print(f\"Replaced: {new_text}\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\nOriginal: Hello, world!
Replaced: Hello, Python!<\/code><\/pre>\n\n\n\n<\/span>11. \u4f7f\u7528 re.split()<\/code><\/strong><\/span><\/h2>\n\n\n\nre.split()<\/code> \u65b9\u6cd5\u6839\u636e\u6b63\u5219\u8868\u8fbe\u5f0f\u5206\u5272\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\nimport re
text = \"Hello, world! Hello, Python!\"
pattern = r\"!\"
parts = re.split(pattern, text)
print(f\"Text split by '!': {parts}\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\nText split by '!': ['Hello, world', ' Hello, Python', '']<\/code><\/pre>\n\n\n\n<\/span>12. \u4f7f\u7528 re.compile()<\/code><\/strong><\/span><\/h2>\n\n\n\nre.compile()<\/code> \u65b9\u6cd5\u7f16\u8bd1\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u63d0\u9ad8\u591a\u6b21\u4f7f\u7528\u7684\u6548\u7387\u3002<\/p>\n\n\n\nimport re
text = \"Hello, world! Hello, Python!\"
pattern = re.compile(r\"Hello\")
matches = pattern.findall(text)
print(f\"Pattern 'Hello' is found {len(matches)} times in '{text}'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\nPattern 'Hello' is found 2 times in 'Hello, world! Hello, Python!'<\/code><\/pre>\n\n\n\n<\/span>13. \u4f7f\u7528 re.escape()<\/code><\/strong><\/span><\/h2>\n\n\n\nre.escape()<\/code> \u65b9\u6cd5\u8f6c\u4e49\u7279\u6b8a\u5b57\u7b26\uff0c\u9632\u6b62\u5b83\u4eec\u88ab\u89e3\u91ca\u4e3a\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u4e00\u90e8\u5206\u3002<\/p>\n\n\n\nimport re
text = \"Hello, world! Hello, Python!\"
special_char = \".\"
escaped_char = re.escape(special_char)
pattern = f\"{escaped_char}\"
matches = re.findall(pattern, text)
print(f\"Pattern '{escaped_char}' is found {len(matches)} times in '{text}'\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\nPattern '\\.' is found 2 times in 'Hello, world! Hello, Python!'<\/code><\/pre>\n\n\n\n<\/span>\u5b9e\u6218\u6848\u4f8b\uff1a\u65e5\u5fd7\u6587\u4ef6\u5206\u6790<\/strong><\/span><\/h2>\n\n\n\n\u5047\u8bbe\u4f60\u6709\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\uff0c\u8bb0\u5f55\u4e86\u7528\u6237\u7684\u8bbf\u95ee\u4fe1\u606f\uff0c\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n
2023-10-01 12:00:00 - User1 - Page1
2023-10-01 12:01:00 - User2 - Page2
2023-10-01 12:02:00 - User1 - Page3
2023-10-01 12:03:00 - User3 - Page1<\/code><\/pre>\n\n\n\n\u6211\u4eec\u9700\u8981\u5206\u6790\u8fd9\u4e2a\u65e5\u5fd7\u6587\u4ef6\uff0c\u7edf\u8ba1\u6bcf\u4e2a\u7528\u6237\u8bbf\u95ee\u7684\u9875\u9762\u6b21\u6570\u3002<\/p>\n\n\n\n
import re
from collections import defaultdict
# \u5047\u8bbe\u8fd9\u662f\u65e5\u5fd7\u6587\u4ef6\u7684\u5185\u5bb9<\/em>
log_content = \"\"\"
2023-10-01 12:00:00 - User1 - Page1
2023-10-01 12:01:00 - User2 - Page2
2023-10-01 12:02:00 - User1 - Page3
2023-10-01 12:03:00 - User3 - Page1
\"\"\"
# \u7f16\u8bd1\u6b63\u5219\u8868\u8fbe\u5f0f<\/em>
pattern = re.compile(r\"(\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}) - (\\w+) - (\\w+)\")
# \u521b\u5efa\u4e00\u4e2a\u5b57\u5178\u6765\u5b58\u50a8\u7528\u6237\u8bbf\u95ee\u7684\u9875\u9762\u6b21\u6570<\/em>
user_page_count = defaultdict(lambda: defaultdict(int))
# \u904d\u5386\u65e5\u5fd7\u5185\u5bb9\uff0c\u5339\u914d\u6bcf\u4e00\u884c<\/em>
for line in log_content.strip().split('\\n'):
match = pattern.match(line)
if match:
timestamp, user, page = match.groups()
user_page_count[user][page] += 1
# \u8f93\u51fa\u7ed3\u679c<\/em>
for user, pages in user_page_count.items():
print(f\"User: {user}\")
for page, count in pages.items():
print(f\" Page: {page}, Count: {count}\")<\/code><\/pre>\n\n\n\n\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\nUser: User1
Page: Page1, Count: 1
Page: Page3, Count: 1
User: User2
Page: Page2, Count: 1
User: User3
Page: Page1, Count: 1<\/code><\/pre>\n\n\n\n