How to solve many if else statement in Python?

I have no idea about how to tackle many if/else statements in python.

Here is my dictionary object which is shown below. There are nearly 30 values containing characters and strings in the dict object.

{
     'a': 0, 
     'b': 1,
     'c': 2,
     'd': 3,
     'e': 4,
     'f': 5,
     'g': 6,
     'h': 7,
     ...
     'aba': 7,
     ...
}

When I input the key value of the dictionary, it returns its value.

key= input('Enter object key : ')
answer= getValue(key)

How can I define a getValue() method?