DICTIONARY IN PYTHON

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 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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