how to fill the value 'None' if the main list value is not presented in sublist-CodePudding

I am trying to create the new nested list from one main-list and different sub-lists. sub list values are presented in main list. I have a main list like this.All the sub-list values are unique values of main list.

mainlist = ['a', 'b', 'c', 'd', 'e']

sublist are like this.

sublista = ['a', 'b']
sublistb = ['c', 'd', 'e']
sublistc = ['b', 'e']
sublistd = ['c']

I want to get the final list like this.

combined_list = [['yes', 'yes', None, None, None],
                 [None, None, 'yes', 'yes', 'yes'],
                 [None, 'yes', None, None, 'yes'],
                 [None, None, 'yes', None, None]]

CodePudding user response：

You can use list comprehension combined with a conditional expression, like this:

mainlist = ['a', 'b', 'c', 'd', 'e']
sublista = ['a', 'b']

result = ["yes" if e in sublista else None for e in mainlist]
print(result)

But you need to decide how to handle those sublists, since holding each one as a separate variable is not manageable in the long run. Maybe combine them into a single list (of lists)?