Python中字符串的学习

时间:2022-09-25 06:07:53

Python中字符串的学习

一、字符串的格式化输出

  1. % 占位符
    • %s 字符串
    • %d integer
    • %x 十六进制 integer
    • %f float
  2. 指定长度
    • %5d 右对齐,不足左边补空格
    • %-5d - 代表左对齐,不足右边默认补空格
    • %05d 右对齐,不足左边补0

      -浮点数:
      • %f 默认是输出6位有效数据, 会进行四舍五入
      • %.2f 指定小数点位数的输出 保留小数点后2位
      • '%4.8f' 4代表整个浮点数的长度,包括小数,只有当

        字符串的长度大于4位才起作用.不足4位空格补足,可以用%04.8使用0补足空格

二、字符串的format方法

  • 顺序填坑:{} 占位符
  • 下标填坑
  • 变量填坑
  • 对齐
    • {:5} 指定输出长度=5
    • 字符串 {:5}--左对齐
    • 数值 {:5}--右对齐
    • 使用 > < 可以避免字符串/数值对齐方法不一致
      • > 右对齐
      • < 左对齐
      • 中间对齐 ^
      • 不足的长度用*表示

三、格式化 f''

  • python3.6 后的版本支持。
  • f'名字是:{name},年龄是:{age}'

四、测试代码:

name = 'xiaolee'
age = 45
height = 1.7234782342 intro1 = 'My name is %s, I\'m %d years old, and my height is %f Metres.'
intro2 = 'My name is %s, I\'m %10d years old, and my height is %.2f Metres.'
intro3 = 'My name is %s, I\'m %-10d years old, and my height is %4.2f Metres.'
intro4 = 'My name is %s, I\'m %010d years old, and my height is %08.2f Metres.'
intro5 = 'My name is %s, I\'m %x years old, and my height is %08.2f Metres.'
intro6 = 'My name is {}, I\'m {} years old, and my height is {} Metres.'
intro7 = 'My name is {2}, I\'m {1} years old, and my {0} is %08.2f Metres.'
intro8 = 'My name is {name0}, I\'m {age0} years old, and my height is {height0} Metres.'
intro9 = 'My name is {0:*<15}, I\'m {1:*>11} years old, and my height is {2:*^20} Metres.'
introA = 'My name is {0:<15}, I\'m {1:>11} years old, and my height is {2:^20} Metres.'
introB = 'My name is {0:#<15}, I\'m {1:$>11} years old, and my height is {2:8^20} Metres.'
introC = f'My name is {name}, I\'m {age} years old, and my height is {height} Metres.' print(intro1 % (name, age, height))
print(intro2 % (name, age, height))
print(intro3 % (name, age, height))
print(intro4 % (name, age, height))
print(intro5 % (name, age, height)) print(intro6.format(name, age, height))
print(intro7.format(height, age, name))
print(intro8.format(age0=age, name0=name, height0=height)) print(intro9.format(name, age, height))
print(introA.format(name, age, height))
print(introB.format(name, age, height)) print(introC)

程序执行结果:

Python中字符串的学习

本文主要参照这篇博文,测试程序重新写。

Python 字符串格式化输出的3种方式