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Python入门必看!100个核心语法知识点清单(第3弹:文件操作、异常处理与日期时间)

  • 2026-03-26 23:51:59
Python入门必看!100个核心语法知识点清单(第3弹:文件操作、异常处理与日期时间)

 往期回顾:在前篇文章中,我们学习了函数、模块与面向对象编程。如果你还没看,记得去主页补课哦!

本期重点:今天我们来掌握Python的文件操作、异常处理与日期时间

01

📁 第七部分:文件操作 (File Operations)

让程序与外界交互! 文件操作是数据持久化的基础,读取配置、保存结果、处理日志都离不开它。掌握with语句,让文件操作更安全!

4️⃣8️⃣ 打开文件

f = open("test.txt""r")

4️⃣9️⃣ 文件模式

  • "r":只读
  • "w":写入
  • "a":追加
  • "b":二进制

5️⃣0️ 读取文件

content = f.read()line = f.readline()lines = f.readlines()

5️⃣1️⃣ 写入文件

f.write("Hello\n")

5️⃣2️⃣ 关闭文件

f.close()

5️⃣3️ with 语句

withopen("test.txt""r"as f:    content = f.read()

5️⃣4️⃣ 文件指针

f.seek(0)pos = f.tell()

5️⃣5️⃣ 删除文件

import osos.remove("test.txt")

5️⃣6️⃣ 检查文件存在

os.path.exists("test.txt")

5️⃣7️⃣ 获取文件大小

os.path.getsize("test.txt")

5️⃣8️⃣ 二进制读取

withopen("image.png""rb"as f:    data = f.read()

02

⚠️ 第八部分:异常处理 (Exception Handling)

让程序更健壮! 程序总会出错,异常处理能让你的代码优雅地应对错误,而不是直接崩溃。生产环境代码的必备技能,用户友好度的关键!

5️⃣9️⃣ try-except

try:    x = 1 / 0except ZeroDivisionError:    print("错误")

6️⃣0️⃣ 多个异常

except (ValueError, TypeError):    pass

6️⃣1️ 捕获所有异常

except Exception as e:    print(e)

6️⃣2️⃣ else 子句

else:    print("无异常")

6️⃣3️⃣ finally 子句

finally:    f.close()

6️⃣4️⃣ raise

raise ValueError("错误")

6️⃣5️⃣ 自定义异常

class MyError(Exception):    pass

6️⃣6️⃣ assert

assert x > 0"x必须为正"

03

📅 第九部分:日期时间 (Date & Time)

时间管理大师! 处理日志、定时任务、数据时间戳都离不开datetime模块。学会日期格式化,让你的程序能理解和操作时间!

6️⃣7️⃣ 导入模块

from datetime import datetime, date, timedelta

6️⃣8️⃣ 当前时间

now = datetime.now()today = date.today()

6️⃣9️⃣ 创建日期

d = date(202411)

7️⃣0️ 格式化

now.strftime("%Y-%m-%d")

7️⃣1️⃣ 解析字符串

datetime.strptime("2024-01-01""%Y-%m-%d")

7️⃣2️⃣ 日期计算

tomorrow = today + timedelta(days=1)

7️⃣3️⃣ 时间戳

timestamp = datetime.now().timestamp()

04

🔍 第十部分:正则表达式 (Regular Expressions)

文本处理的瑞士军刀! 正则表达式能高效匹配、搜索、替换文本模式。学一次用终身,爬虫、数据清洗、表单验证都离不开它!

7️⃣4️ 导入模块

import re

7️⃣5️ match

re.match(r"\d+""123abc")

7️⃣6️⃣ search

re.search(r"\d+""abc123")

7️⃣7️⃣ findall

re.findall(r"\d+""a1b2c3")

7️⃣8️⃣ sub

re.sub(r"\d""*""a1b2c3")

7️⃣9️⃣ 常用模式

  • \d:数字
  • \w:字母数字
  • \s:空白
  • *:0次或多次
  • +:1次或多次

8️⃣0️ 分组

m.group(1)

05

🔄 第十一部分:迭代器与生成器 (Iterators & Generators)

内存优化神器! 处理大数据时,生成器可以按需产生数据,避免一次性加载所有数据到内存。百万级数据处理必备,性能提升关键!

8️⃣1️⃣ 可迭代对象

for x in [1, 2, 3]:    pass

8️⃣2️ 迭代器

it = iter([123])next(it)

8️⃣3️⃣ 生成器函数

def count():    for i in range(5):        yield i

8️⃣4️⃣ 生成器表达式

g = (x**2 for x in range(5))

8️⃣5️⃣ 生成器优势

节省内存,适合大数据流

06

🎨 第十二部分:装饰器 (Decorators)

不修改代码增强功能! 装饰器是Python最优雅的特性之一,可以在不改变原函数的情况下添加新功能。框架源码必备知识,进阶高手标志!

8️⃣6️⃣ 基础装饰器

@decoratordef func():    pass

8️⃣7️⃣ 带参数装饰器

@repeat(3)def greet():    print("Hi")

8️⃣8️⃣ 内置装饰器

  • @staticmethod
  • @classmethod
  • @property

07

🧩 第十三部分:常用内置函数 (Built-in Functions)

Python自带的工具箱! 这些内置函数能解决80%的常见需求,熟练掌握能让你的代码更简洁、更高效。每天用,天天见,必须记住!

8️⃣9️⃣ len()

len([123])  # 3

9️⃣0️⃣ range()

list(range(5))  # [0, 1, 2, 3, 4]

9️⃣1️⃣ enumerate()

for i, v in enumerate(["a""b"]):    print(i, v)

9️⃣2️⃣ zip()

for ab in zip([1, 2]["x""y"]):    print(a, b)

9️⃣3️⃣ map()

list(map(lambda x: x**2, [123]))

9️⃣4️⃣ filter()

list(filter(lambda x: x > 0, [-101]))

9️⃣5️⃣ sorted()

sorted([312])  # [1, 2, 3]

9️⃣6️ sum()

sum([123])  # 6

9️⃣7️⃣ max() / min()

max([123])  # 3

9️⃣8️⃣ any() / all()

any([FalseTrue])  # Trueall([TrueTrue])   # True

9️⃣9️⃣ isinstance()

isinstance(5int)  # True

🔟0️⃣ help() / dir()

help(str)dir([])

🎉 完结撒花!

恭喜!你已经掌握了100个Python核心语法知识点!


📚 学习建议

  • 多写代码:每个知识点都动手试试
  • 做项目:用所学知识完成小项目
  • 查文档:遇到问题先查官方文档
  • 常回顾:定期复习这份清单
  • 不要死记硬背:理解原理更重要

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  1. CONNECT:[ UseTime:0.000412s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000713s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008849s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001185s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000613s ]
  6. SELECT * FROM `set` [ RunTime:0.000631s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000638s ]
  8. SELECT * FROM `article` WHERE `id` = 481811 LIMIT 1 [ RunTime:0.002384s ]
  9. UPDATE `article` SET `lasttime` = 1774589284 WHERE `id` = 481811 [ RunTime:0.009125s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001815s ]
  11. SELECT * FROM `article` WHERE `id` < 481811 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004054s ]
  12. SELECT * FROM `article` WHERE `id` > 481811 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008445s ]
  13. SELECT * FROM `article` WHERE `id` < 481811 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.022319s ]
  14. SELECT * FROM `article` WHERE `id` < 481811 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014274s ]
  15. SELECT * FROM `article` WHERE `id` < 481811 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.026819s ]
0.175182s