如何检查元素是否是列表和整数列表的一部分？

Question

I need to check if an element is part of a list, but the list looks like:

>>> lst = [[1,2], 3, [1,2], [1,4]]
>>> possible = [1,4]

I tried to check it with multiple for-loops, but the problem is the integer, it isn't iterable.

>>> for pos_elem in range(len(possible)):
       for i in lst:
          for j in i:
             if possible[pos_elem] == j:
                print j

Is there a code that will check every element of lst without error?

Answer 1

if possible in lst:
    #do something

Python has membership operators, which test for membership in a sequence, such as strings, lists, or tuples. There are two membership operators. in and not in

• in Evaluates to true if it finds a variable in the specified sequence and false otherwise.
• not in Evaluates to true if it does not finds a variable in the specified sequence and false otherwise.

Answer 2

You could use python's built in type to check if the element in the list is a list or not like so:

     lst = [[1, 2], 3, [1, 2], [1, 4]]
        possible = [1, 4]


        for element in lst:

            #checks if the type of element is list
            if type(element) == list:
                for x in element:
                    if x in possible:
                        print x
            else:
                if element in possible:
                    print element

Prints:

1
1
1
4