Python syntax error when defining a mapping [closed]

Answer 1

Your datatype to define states, cities should be dictionary.

states = {
'Bihar' : 'BIH',
'Jharkhand' : 'JK',
'Bengal' : 'BEN',
'Tamilnadu' : 'TN',
'Haryana' : 'HY',
'Kerla' : 'KER'
}

You should change same for cities.
Please follow this link to learn about dictionary .python doc

Answer 2

You are using the wrong syntax to define a dictionary. You need to use {..} (curly braces), not [..] (square brackets, used for lists):

# states and their abbreviation
states = {
    'Bihar': 'BIH',
    'Jharkhand': 'JK',
    'Bengal': 'BEN',
    'Tamilnadu': 'TN',
    'Haryana': 'HY',
    'Kerla': 'KER',
}

# states with their cities
cities = {
    'BIH': 'Patna',
    'JK': 'Ranchi',
    'BEN': 'Kolkatta',
}

The commas between key-value pairs are mandatory too.