Python的成员资格运算符测试序列中的成员资格,例如字符串,列表或元组。有两个成员运算符,如下 -
序号 | 运算符和说明 | 例 |
---|---|---|
1 | 在 评估为TRUE,如果它发现了指定的顺序,否则为假在变量中。 | x in y,如果x是序列y的成员,则结果为1。 |
2 | not in 如果找不到指定序列中的变量,则评估为true,否则为false。 | x不在y中,如果x不是序列y的成员,则此处的结果不为1。 |
#!/usr/bin/python a = 10 b = 20 list = [1, 2, 3, 4, 5 ]; if ( a in list ): print "Line 1 - a is available in the given list" else: print "Line 1 - a is not available in the given list" if ( b not in list ): print "Line 2 - b is not available in the given list" else: print "Line 2 - b is available in the given list" a = 2 if ( a in list ): print "Line 3 - a is available in the given list" else: print "Line 3 - a is not available in the given list"
输出结果
当您执行上述程序时,它将产生以下结果-
Line 1 - a is not available in the given list Line 2 - b is not available in the given list Line 3 - a is available in the given list