PYTHON DICTIONARIES (5/30)
In Python, dictionaries are data structures that contain key/value associations. You can think of them a bit like a big bag of variables (keys) associated with values (except they're not variables, but keys).
Dictionaries are very useful for storing the parameters W1, b1, W2, b2, etc. of a neural network developed with Numpy.
Another useful feature: we can use dictionaries to save lots of data from files on our computers in keys that bear the names of these files.
Several methods are useful for dictionaries:
dict.values(): returns the dictionary values
dict.keys(): returns the dictionary keys
dict.items(): returns the dictionary key:value pairs
dict.get(key): returns the value of a key, otherwise a default value
dict.fromkeys(list): allows you to create a dictionary from a list
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