Dictionary

Making a dictionary:
a = {'key1': 'some value', 'key2': 4.1}
a['key1'] = 'another string value'
a['key2'] = [0, 1]  # change value from float to string
a['another key'] = 1.1E+7   # add a new (key,value) pair
Important: no natural sequence of (key,value) pairs!
Traversing dictionaries:
for key in some_dict:
    # process key and corresponding value in some_dict[key]

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