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Python 零基础入门核心知识点总结

  • 2026-06-29 08:47:10
Python 零基础入门核心知识点总结

1.常用关键字

1.1 基础常用

  • if:条件判断

  • else:否则

  • elif:否则如果

  • for:循环

  • while:循环

  • break:跳出循环

  • continue:跳过本次循环

  • return:函数返回值

  • def:定义函数

  • class:定义类

1.2 逻辑与判断

  • and:并且

  • or:或者

  • not:非

  • in:在… 里面

  • is:是(判断身份)

  • True:真

  • False:假

  • None:空值

1.3 异常与结构

  • try:尝试执行

  • except:捕获异常

  • finally:最终一定执行

  • raise:主动抛出异常

  • pass:空语句,占位用

  • import:导入模块

  • from:从模块导入

  • as:起别名

1.4 其他高频

  • global:声明全局变量

  • nonlocal:声明外层非全局变量

  • with:简化资源操作(文件、锁等)

  • del:删除变量 / 对象

2.基础语法

2.1 输出与输入

  1. 打印内容:print()

    print("Hello Python")print(123)
  2. 获取用户输入:input()

    name = input("请输入名字:")print("你好," + name)

2.2 变量与命名规则

  1. 变量用来存数据:a = 10

  2. 命名规则:

    • 只能字母、数字、下划线

    • 不能数字开头

    • 区分大小写,不能用关键字(if/for/else 等)


2.3 常见数据类型

  1. 整数 int:1, 100, -5

  2. 浮点数 float:3.14, 0.5

  3. 字符串 str:用单 / 双引号包裹,"你好"

  4. 布尔值 boolTrue / False

  5. 空值 None:表示什么都没有

  6. 查看类型:

    print(type(123))  # <class 'int'>

2.4 常用运算符

  1. 算术:

    + - * / % // **
    • % 取余

    • // 整除

    • ** 次方

  2. 比较:> < >= <= == !=

  3. 逻辑:andornot

2.5 字符串操作

  1. 拼接:"a" + "b"

  2. 重复:"Hi" * 3

  3. 切片(取字符):

    s = "abcdef"print(s[0])    # 第一个字符print(s[1:3])  # 第2到第3个

2.6 列表 list(最常用容器)

  1. 有序、可修改

    lst = [1, 2, "apple", True]lst.append(3)    # 添加lst[0] = 100     # 修改del lst[1]       # 删除

2.7 字典 dict(键值对)

info = {"name": "小明", "age": 20}print(info["name"])info["age"] = 21

2.8 条件判断(if)

score = 85if score >= 60:    print("及格")elif score >= 90:    print("优秀")else:    print("不及格")

注意:Python 用缩进代表代码块,非常重要!

2.9 循环语句

for 循环

for i in range(5):    print(i)

while 循环

n = 0while n < 5:    print(n)    n += 1

2.10 函数 def

封装重复代码:

def add(a, b):    return a + bprint(add(1, 2))

2.11 注释

  1. 单行:# 注释内容

  2. 多行:""" 注释 """

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  1. CONNECT:[ UseTime:0.000467s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000575s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000286s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000260s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000495s ]
  8. SELECT * FROM `article` WHERE `id` = 488677 LIMIT 1 [ RunTime:0.004557s ]
  9. UPDATE `article` SET `lasttime` = 1783134197 WHERE `id` = 488677 [ RunTime:0.011770s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000319s ]
  11. SELECT * FROM `article` WHERE `id` < 488677 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000504s ]
  12. SELECT * FROM `article` WHERE `id` > 488677 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000422s ]
  13. SELECT * FROM `article` WHERE `id` < 488677 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001353s ]
  14. SELECT * FROM `article` WHERE `id` < 488677 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001801s ]
  15. SELECT * FROM `article` WHERE `id` < 488677 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007869s ]
0.102428s