Dictionary in Python
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In this lecture we are discussing about Dictionary:
-- if you want to accessing the data by using key then we are using dictionary
-- Dictionary uses key and value pair
key and value
in python
data={1:'Navin',2:'kiran',4:'Harsh'} # 1 is key and Navin is value and 2 is key and kiran is value and 4 is key and Harsh is value
property of dictionary:
-- key must be immutable and unique
immutable means we can't change the value
unique means we can't repeat the key
-- value can be anything
-- we can access the value by using key
-- we can't access the value by using index
-- we can't access the value by using value
fetching the value from dictionary
data[4] # we can access the value by using key here key is 4
data[3] # you get error because key is not present in dictionary
get() method:
-- we can access the value by using get() method
-- if key is present in dictionary then it will return the value
-- if key is not present in dictionary then it will return None
data.get(1)
data.get(3) # not get anything
print(data.get(3)) # it will return None
data.get(1,'Not Found')
data.get(3,'Not Found')
use of zip() method:
-- we can combine the two list by using zip() method
-- it will return the tuple
keys = ['Navin','Kiran','Harsh']
values=['Python','Java','JS']
use of dict() method:
-- we can convert the tuple into dictionary by using dict() method
data=dict(zip(keys,values))
data['Kiran']
data['Monika'] # it will give error because key is not present in dictionary
add the value in dictionary:
data['Monika']='CS'
data
delete the value from dictionary:
del data['Harsh']
Nested Dictionary:
-- we can store the dictionary inside the dictionary
prog={'JS':'Atom','CS':'VS','Python':['Pycharm','Sublime'],'Java':{'JSE':'Netbeans','JEE':'Eclipse'}}
prog
prog['JS']
prog['python'][1]
prog['Java']
prog['Java']['JEE']
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