swapCase()方法返回所有可大小写，基于字符大小写交换字符串的一个副本。
语法
以下是swapCase()方法的语法：
str.swapcase();
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参数
返回值
此方法返回其中所有基于大小写字符交换字符串的一个副本。
例子
下面的例子显示的swapCase()方法的使用。
#!/usr/bin/python
str = "this is string example....wow!!!";
print str.swapcase();
str = "THIS IS STRING EXAMPLE....WOW!!!";
print str.swapcase();
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当我们运行上面的程序，它会产生以下结果：
THIS IS STRING EXAMPLE....WOW!!!
this is string example....wow!!!
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