Python中字符串转换大小写的方法有三种:
s = "hello"
s_upper = s.upper()
print(s_upper) # 输出:HELLO
s = "HELLO"
s_lower = s.lower()
print(s_lower) # 输出:hello
s = "hello world"
s_title = s.title()
print(s_title) # 输出:Hello World
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