>>> a in 'abcd'
Traceback (most recent call last):
File "<pyshell#7>", line 1, in <module>
a in 'abcd'
TypeError: 'in <string>' requires string as left operand, not list
>>>
>>> a in 'abcd'
Traceback (most recent call last):
File "<pyshell#7>", line 1, in <module>
a in 'abcd'
TypeError: 'in <string>' requires string as left operand, not list