Python str.swapcase() 大小写互换

# 示例 1
"Hello, World!".swapcase()  # 输出: hello, wORLD!

# 示例 2
"Python Programming".swapcase()  # 输出: pYTHON pROGRAMMING

# 示例 3
"This Is A Sentence.".swapcase()  # 输出: tHIS iS a sENTENCE.

# 示例 4
"Coding is Fun!".swapcase()  # 输出: cODING IS fUN!

# 示例 5
"MiXeD CaSe StRiNg".swapcase()  # 输出: mIxEd cAsE sTrInG

# 示例 6
"UsErNaMe".swapcase()  # 输出: uSeRnAmE

# 示例 7
"The Quick Brown Fox".swapcase()  # 输出: tHE qUICK bROWN fOX

# 示例 8
"PyThOn".swapcase()  # 输出: pYtHoN

# 示例 9
"aBc123!@#".swapcase()  # 输出: AbC123!@#

# 示例 10
"To Be Or Not To Be".swapcase()  # 输出: tO bE oR nOT tO bE