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SEQUENCES

• are iterables that support element access using integer indices

Dictionaries

• Data in a dictionary is organized into pairs of keys and values.
• use the key to access the corresponding value (indexed by keys).
• Keys have to be unique always.

Image to remember: In an English language dictionary the word comes with a definition.
In a Python dictionary, the word would be the key and the definition would be the value. 

Syntax

	x = {key1:value1, key2:value2} 
	# a key value pair
	x = {
		key1:value1,
		key2:value2
		} 
	# for readability

	x = dict(bodystyle="truck", make="Ford", drivetrain="Four-wheel Drive")
	#no empty spaces allowed here
	y = dict('bodystyle': 'truck', 'make': 'Ford', 'drivetrain': 'Rear-wheel Drive')
	# empty spaces are ok here
	# using the dict() constructor

	x = {} 
	print(type(x))
	<class 'dict'>

Example

f150_2018 = {
    'XLT': {
        'cabin_size': 'SuperCab',
        'bed_size': '5.5ft',
        'payload': 1800,  # in pounds
        'drive_train': '4x4',
        'engine_size': '2.7L V6'
    },
    'Lariat': {
        'cabin_size': 'SuperCrew',
        'bed_size': '6.5ft',
        'payload': 2200,  # in pounds
        'drive_train': '4x4',
        'engine_size': '5.0L V8'
    },
    'King Ranch': {
        'cabin_size': 'SuperCrew',
        'bed_size': '5.5ft',
        'payload': 1900,  # in pounds
        'drive_train': '4x2',
        'engine_size': '3.5L V6 EcoBoost'
    },
    'Platinum': {
        'cabin_size': 'SuperCrew',
        'bed_size': '6.5ft',
        'payload': 2100,  # in pounds
        'drive_train': '4x4',
        'engine_size': '3.5L V6 EcoBoost'
    }
}

• Dictionaries are used to organize elements into collections (like lists). 
• Dictionaries map keys to values and store them in an array or collection.
• The keys must be of a hashable type, which means that they must have a hash value that never changes during the key’s lifetime.
• For a list the index is always a number, for a dictionary key it can be a different data type:
  • strings, integers, floats, tuples, and more. 

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Tutorial

• docs.python.org

Style Guide for Python Code

• python.org

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