字符串upper()大写方法

功能

将字符串全体大写

用法

big_str = sring.upper()

参数

函数括弧内什么都不用填写(不用传参数也没有参数)

注意事项

  • 只对字符串中的字母有效
  • 已经是大写, 则无效
  • 2$yes 2$YES

代码

# coding:utf-8
info = 'hello world! hello xiaomu'
big_info = info.upper()
print(big_info)
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与上节课组合练习

# coding:utf-8
info = 'Hello World! Hello XiaoMu'
big_info = info.upper()
small_info = info.lower()
print(big_info)
print(small_info)
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字符串swapcase()字母大小写翻转方法

功能

将字符串中的大小写翻转

用法

newstr = string.swapcase()

参数

函数括弧内什么都不用填写

注意事项

  • 只对字符串中的字母有效
  • number_message = ‘1@oK’ -> ‘1@Ok’

代码

# coding:utf-8
info_one = 'Python Code Is Good'
info_two = 'PYTHON DJANGO FLASK'
info_three = 'python web so easy'
info_one_new = info_one.swapcase()
info_two_new = info_two.swapcase()
info_three_new = info_three.swapcase()
print(info_one_new)
print(info_two_new)
print(info_three_new)
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