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Python语法笔记(一)

  • 2026-08-18 23:11:29
Python语法笔记(一)

Python语法笔记(一)

  目 

        录

    1.Python缩进

    2.不换行打印

    3.全局变量

       (3)global关键词

    4.向多个变量赋值

    5.一个值赋给多个变量

    6.解包集合

    7.输出多个变量

    8.数据类型

    9.随机数

    10.字符串

        (1)裁切

        (2)负的索引

        (3)字符串长度

        (4)字符串方法

        (5)检查字符串

        (6)格式化字符串

1.Python缩进

在其他编程语言中,代码缩进仅出于可读性的考虑,而 Python 中的缩进非常重要

if5 > 2:  print("Five is greater than two!")

如果省略缩进,Python 会出错,空格数取决于程序员,但至少需要一个,同时必须在同一代码块中使用相同数量的空格,否则 Python 会出错

2.不换行打印

默认情况下,print() 函数会在打印结束时换行。如果要在同一行打印多个单词,可以使用 end 参数:

print("Hello World!", end=" ")print("I will print on the same line.")#输出如下#Hello World! I will print on the same line.

3.全局变量

在函数外部创建的变量称为全局变量,全局变量可以被函数内部和外部的每个人使用。

(1)在函数外部创建变量,并在函数内部使用它:

x = "awesome"defmyfunc():   print("Python is " + x)myfunc()#Python is awesome

(2)如果在函数内部创建具有相同名称的变量,则该变量将是局部变量,并且只能在函数内部使用。具有相同名称的全局变量将保留原样,并拥有原始值。

x = "awesome"defmyfunc():  x = "fantastic"  print("Python is " + x)myfunc()#Python is fantasticprint("Python is " + x)#Python is awesome

(3)global关键词

通常,在函数内部创建变量时,该变量是局部变量,只能在该函数内部使用。要在函数内部创建全局变量,可以使用global关键字。

defmyfunc():  global x #虽然在函数内部,但global使其成为属于全局范围  x = "fantastic"myfunc()print("Python is " + x) #Python is fantastic

要在函数内部更改全局变量的值,可以使用 global 引用该变量:

x = "awesome"defmyfunc():  global x  x = "fantastic"myfunc()print("Python is " + x) #Python is awesome

4.向多个变量赋值

Python允许在一行中为多个变量赋值:

x, y, z = "Orange""Banana""Cherry"print(x)print(y)print(z)#输出如下:"""OrangeBananaCherry"""

5.一个值赋给多个变量

x = y = z = "Orange"print(x)print(y)print(z)#输出如下:"""OrangeOrangeOrange"""

6.解包集合

有一个包含值的集合,例如列表(list)、元组(tuple)等等, Python 允许将这些值提取到变量中,这称为解包。

fruits = ["apple""banana""cherry"]x, y, z = fruitsprint(x)print(y)print(z)#输出如下:"""applebananacherry"""

7.输出多个变量

在 print() 函数中输出多个变量的最佳方法是用逗号分隔,这样甚至可以支持不同的数据类型:

x = 5y = "John"print(x, y) #5 John

8.数据类型

(1)Python 默认拥有以下内置数据类型:

(2)可以使用 type() 函数获取任何对象的数据类型

x = 5y = 12E4z = 1jprint(type(x)) #<class 'int'>print(type(y)) #<class 'float'>print(type(z)) #<class 'complex'>

9.随机数

Python 没有 random() 函数来创建随机数,但 Python 有一个名为 random 的内置模块,可用于生成随机数:

import randomprint(random.randrange(110)) #显示 1 到 9 之间的随机数

10.字符串

(1) 裁切:返回一定范围的字符

b = "Hello, World!"#获取从位置 2 到位置 5(不包括)的字符print(b[2:5]) #llo#获取从开头到位置 5(不包括)的字符print(b[:5]) #Hello#省略 end 索引,范围将延伸到末尾print(b[2:]) #llo, World!

(2) 负的索引:从字符串末尾开始切片

#获取从位置 5 到位置 1 的字符,从字符串末尾开始计数:b = "Hello, World!"print(b[-5:-2]) #orl

(3) 字符串长度:使用 len() 函数

a = "Hello, World!"print(len(a)) #13

(4) 字符串方法

  1)strip() 方法删除开头和结尾的空白字符

a = " Hello, World! "print(a.strip()) #Hello, World!

  2)lower() 返回小写的字符串

a = "Hello, World!"print(a.lower()) #hello, world!

   3)upper() 方法返回大写的字符串

a = "Hello, World!"print(a.upper()) #HELLO, WORLD!

  4)replace() 用另一段字符串来替换字符串

a = "Hello, World!"print(a.replace("H""J")) #Jello, World!

  5)split() 方法在找到分隔符的实例时拆分字符串为子字符串

a = "Hello, World!"print(a.split(",")) # ['Hello', ' World!']

(5) 检查字符串

如需检查字符串中是否存在特定短语或字符,可以使用 in 或 not in关键字。

#检查以下文本中是否存在短语 "ain":txt = "The rain in Spain stays mainly in the plain"x = "ain"in txtprint(x) #True

(6) 格式化字符串

只需在字符串字面量前面加上 f,并添加花括号 {} 作为变量和其他操作的占位符。

price = 59txt1 = f"The price is {price} dollars"#占位符可以包含修饰符来格式化值txt2 = f"The price is {price:.2f} dollars"#占位符可以包含 Python 代码,例如数学运算txt3 = f"The price is {20+39} dollars"print(txt1) # The price is 59 dollarsprint(txt2) # The price is 59.00 dollarsprint(txt3) # The price is 59 dollars

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  1. CONNECT:[ UseTime:0.001349s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001728s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000733s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000627s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001443s ]
  6. SELECT * FROM `set` [ RunTime:0.000606s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001523s ]
  8. SELECT * FROM `article` WHERE `id` = 507714 LIMIT 1 [ RunTime:0.001154s ]
  9. UPDATE `article` SET `lasttime` = 1787313665 WHERE `id` = 507714 [ RunTime:0.024869s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000767s ]
  11. SELECT * FROM `article` WHERE `id` < 507714 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001412s ]
  12. SELECT * FROM `article` WHERE `id` > 507714 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001574s ]
  13. SELECT * FROM `article` WHERE `id` < 507714 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005083s ]
  14. SELECT * FROM `article` WHERE `id` < 507714 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002835s ]
  15. SELECT * FROM `article` WHERE `id` < 507714 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002464s ]
0.219213s