在python中判断 list 中是否包含某个元素：可以通过in和not in关键字来判断
例如：
abcList=['a','b','c',1,2,3]
if 'a' in abcList:
print('a is in abcList')
if 'd' not in abcList:
print('d is not in abcList')
if 1 in abcList:
print('1 is in abcList')
结果为：
