python upper(),lower(),title(),capitalize()

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1. str.upper():转换为大写

2. str.lower():转换为小写

3. str.title():每一个单词的首字母大写

4. str.capitalize():字符串首字符大写


Example:

abc = " apple is not APPLE!"
abcd = "apple is not APPLE!"
print(abc.upper())
print(abc.lower())
print(abc.title())
print(abc.capitalize())
print(abcd.capitalize())

  APPLE IS NOT APPLE!

 apple is not apple!

 Apple Is Not Apple!

 apple is not apple!

Apple is not apple!

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