Python Tutorials # 4 : Data type : Dictionary

Dictionaries are yet another kind of compound type. They are Python’s built-in mapping type. They map keys, which can be any immutable type, to values, which can be any type (heterogeneous), just like the elements of a list or tuple. In other languages, they are called associative arrays since they associate a key with a value.

[mfrumer]

Thank you. That is a very clear explanation of what should be a very useful type of data.