How to check if an element is in a list that is in a dictionary?

Question

Python

I need to check if the element I need is in the list which is in the dictionary, how can I do this?
dict = {ids:[1,2,3]}

Answer 1

In [1]: dict = {'ids': [1,2,3]}

In [2]: 1 in dict['ids']
Out[2]: True

In [3]: 123 in dict['ids']
Out[3]: False

In [4]: 1 in dict.get('ids')
Out[4]: True

In [5]: 1 in dict.get('ids1', [])
Out[5]: False