自学python 第八天：语句 循环语句 嵌套

#嵌套循环 #在一个循环体中嵌套另外一个或多个循环 ''' Grammar: for 嵌套 for iterating_var in sequence:    for iterating_var in sequence:       statements(s)    statements(s) while 嵌套 while expression: while wxpression: stateme

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