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从0到1学习Python的基本语法

  • 2026-07-08 17:58:56
从0到1学习Python的基本语法

1. 变量与数据类型

  • 变量
    :变量是存储数据的容器,其命名需遵循特定规则。必须以字母或下划线开头,后续可接字母、数字或下划线,且不能与Python关键字冲突。例如:
name = ”Alice”age = 25
  • 数据类型
  • 数字类型
    :包含整数(int)、浮点数(float)和复数(complex)。整数无小数部分,如10;浮点数有小数部分,如3.14;复数由实数与虚数构成,如2 + 3j
  • 字符串(str
    :用于表示文本数据,可由单引号、双引号或三引号括起来。三引号常用于多行字符串。例如:
single_quote = 'Hello'double_quote = ”World”multi_line = '''This is amulti - line string.'''
  • 布尔类型(bool
    :仅有两个取值,TrueFalse,常用于逻辑判断。
  • 列表(list
    :一种有序的可变序列,可容纳不同类型的数据,用方括号表示。例如:
my_list = [1, 'apple', True]
  • 元组(tuple
    :有序的不可变序列,用圆括号表示。例如:
my_tuple = (1, 'banana')
  • 集合(set
    :无序且元素唯一的集合,用花括号或set()函数创建。例如:
my_set = {1, 2, 2, 3}# 实际存储为 {1, 2, 3}
  • 字典(dict
    :无序的键值对集合,用于存储和检索数据,用花括号表示。例如:
my_dict = {'name': 'Bob', 'age': 30}

2. 控制结构

  • 顺序结构
    :程序按语句先后顺序依次执行,这是Python程序的默认执行方式。
  • 选择结构
  • if - elif - else语句
    :用于根据条件执行不同代码块。例如:
num = 10if num > 0: print(”正数”)elif num == 0: print(”零”)else: print(”负数”)
  • Python中没有传统的switch - case语句,但可通过dict模拟类似功能。
  • 循环结构
  • for循环
    :常用于遍历序列(如列表、字符串等)。例如:
fruits = ['apple', 'banana', 'cherry']for fruit in fruits: print(fruit)
  • while循环
    :在条件为真时持续执行代码块。例如:
count = 0while count < 5: print(count) count += 1

3. 函数

  • 定义与调用
    :函数是封装特定功能的代码块,可提高代码复用性。定义函数使用def关键字,后接函数名、参数列表和冒号,函数体需缩进。例如:
def add_numbers(a, b): return a + bresult = add_numbers(3, 5)print(result)
  • 参数传递
    :包括位置参数、关键字参数、默认参数和可变参数。例如:
# 位置参数def subtract(a, b): return a - b# 关键字参数subtract(b = 2, a = 5)# 默认参数def greet(name, message = ”Hello”): print(message, name)greet(”Alice”)# 可变参数def sum_all(*args): total = 0 for num in args: total += num return totalsum_all(1, 2, 3)

4. 类与对象

  • 类的定义
    :类是创建对象的模板,定义使用class关键字。例如:
class Dog: def __init__(self, name, age): self.name = name self.age = age def bark(self): print(self.name, ”is barking.”)
  • 对象的创建与使用
    :通过类实例化对象,然后调用对象的方法。例如:
my_dog = Dog(”Buddy”, 3)my_dog.bark()

5. 模块

  • 模块定义
    :一个Python文件就是一个模块,可包含函数、类和变量等。例如,创建一个my_module.py文件,内容如下:
def square(x): return x * x
  • 模块导入
    :在其他文件中使用import语句导入模块。例如:
import my_moduleresult = my_module.square(5)

也可使用from...import语句导入模块中的特定内容:

from my_module import squareresult = square(5)

6. 异常处理

  • try - except语句
    :用于捕获和处理异常。例如:
try: num = 10 / 0except ZeroDivisionError: print(”不能除以零”)
  • finally
    :无论是否发生异常,finally块中的代码都会执行。例如:
try: num = 10 / 2except ZeroDivisionError: print(”不能除以零”)finally: print(”程序结束”)

7. 文件操作

  • 文件读取
    :使用open()函数打开文件,指定模式为'r'(只读)。例如:
try: with open('example.txt', 'r') as file: content = file.read() print(content)except FileNotFoundError: print(”文件未找到”)
  • 文件写入
    :以'w'(写入,会覆盖原有内容)或'a'(追加)模式打开文件。例如:
with open('example.txt', 'w') as file: file.write(”这是新写入的内容”)

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  1. CONNECT:[ UseTime:0.000694s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000824s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000324s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000304s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000593s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000645s ]
  8. SELECT * FROM `article` WHERE `id` = 503868 LIMIT 1 [ RunTime:0.003873s ]
  9. UPDATE `article` SET `lasttime` = 1783562732 WHERE `id` = 503868 [ RunTime:0.009397s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000354s ]
  11. SELECT * FROM `article` WHERE `id` < 503868 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000676s ]
  12. SELECT * FROM `article` WHERE `id` > 503868 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000483s ]
  13. SELECT * FROM `article` WHERE `id` < 503868 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001104s ]
  14. SELECT * FROM `article` WHERE `id` < 503868 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001156s ]
  15. SELECT * FROM `article` WHERE `id` < 503868 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001467s ]
0.093026s