validate list value if they exist in another list then only put them in python

You can use list comprehension to achieve this. Here's an example:

list1 = [1, 2, 3, 4, 5]
list2 = [3, 4, 5, 6, 7]

result = [x for x in list1 if x in list2]

print(result) # Output: [3, 4, 5]

In the above code, the list comprehension checks each element x in list1 and only adds it to the result list if it exists in list2.