python 中如何判斷list中是否包含某個元素

在python中可以通過in和not in關鍵字來判讀一個list中是否包含一個元素

theList = ['a','b','c']
if 'a' in theList:
    print 'a in the list'
else:
    print 'a is not in the list'
if 'd' not in theList:
    print 'd is not in the list'
else:
    print 'd in the list'