DICTIONARY IN PYTHON

 

 ALL ABOUT DICTIONARY IN PYTHON

THIS IS CODE OF DICTIONARY IN PYTHON YOU CAN COPY PASTE THIS CODE AND RUN AND SEE THE OUTPUT IN THIS CODE I HAVE COVER ALMOST WORK RELATED  TO DICTIONARY.

	# Dictionaries are used to store data values in key:value pairs. # A dictionary is a collection which is ordered*, # changeable and does not allow duplicates.
	# Example of dictionary
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	print(thisdict)
	# Dictionary Items
	thisdict = {
	"brand": "bmw",
	"model": "Mustang",
	"year": 1964
	}
	print(thisdict["brand"])
	# Duplicates Not Allowed
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964,
	"year": 2020
	}
	print(thisdict)
	# Dictionary Length
	print(len(thisdict))
	# Dictionary Items - Data Types
	thisdict = {
	"brand": "Ford",
	"electric": False,
	"year": 1964,
	"colors": ["red", "white", "blue"]
	}
	print("thisdict")
	# type()
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	print(type(thisdict))
	# accessing items list
	thisdict={
	"brand":"ford",
	"model":"mustang",
	"year":1994
	}
	x=thisdict["model"]
	print(thisdict)
	# access items from dictionaries
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	x = thisdict["model"]
	print(x)
	# get keys
	car = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	x = car.keys()
	print(x) #before the change
	car["color"] = "white"
	print(x) #after the change
	# get values
	car = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	x = car.values()
	print(x) #before the change
	car["year"] = 2020
	print(x) #after the change
	# check if keys exits
	car = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	if "model" in thisdict:
	print('''Yes, 'model' is one of the keys in the thisdict
	dictionary''')
	# changes values
	thisdict ={
	"brand":"Ford",
	"model":"Mustang",
	"year":1964
	}
	thisdict["year"] = 2018
	print(thisdict)
	# update dictionaries
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	thisdict.update({"year": 2020})
	# add items
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	thisdict["color"] = "red"
	print(thisdict)
	# updatae items
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	thisdict.update({"color": "red"})
	print(thisdict)
	# remove items
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	thisdict.pop("model")
	print(thisdict)
	# loop dictionaries
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	for x in thisdict:
	print(x)
	# items
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	for x, y in thisdict.items():
	print(x, y)
	# copy dictionaries
	thisdict = {
	"brand": "Ford",
	"model": "Mustang",
	"year": 1964
	}
	mydict = thisdict.copy()
	print(mydict)
	# # nested dictionaries
	# # A dictionary can contain dictionaries,
	# # this is called nested dictionaries.
	myfamily = {
	"child1" : {
	"name" : "Emil",
	"year" : 2004
	},
	"child2" : {
	"name" : "Tobias",
	"year" : 2007
	},
	"child3" : {
	"name" : "Linus",
	"year" : 2011
	}
	}
	print(myfamily)
	# DICTIONARIES METHODS
	'''
	Method Description
	clear() Removes all the
	elements from the dictionary
	copy() Returns a copy
	of the dictionary
	fromkeys() Returns a dictionary
	with the specified keys and value
	get() Returns the value
	of the specified key
	items() Returns a list containing
	a tuple for each key value pair
	keys() Returns a list containing
	the dictionary's keys
	pop() Removes the element
	with the specified key
	popitem() Removes the last
	inserted key-value pair
	setdefault() Returns the value of the specified key.
	If the key does not exist: insert the key,
	with the specified value
	update() Updates the dictionary with
	the specified key-value pairs
	values() Returns a list of all the
	values in the dictionary
	'''

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