Python Dictionary 4

How to change or add elements in a dictionary?

* Dictionary is mutable. We can add new items or change the value of existing items using an assignment operator.

* If the key is already present, value gets updated, else a new key: value pair is added to the dictionary.

Example:1

n={“roll”:101,”name”:”Ajay”,”age”:21,”per”:99}
print(n)
n[“roll”]=500
print(n)
n[“name”]=”komal”
print(n)
n[“age”]=25
print(n)
n[“per”]=100
print(n)

Output:

{‘roll’: 101, ‘name’: ‘Ajay’, ‘age’: 21, ‘per’: 99}
{‘roll’: 500, ‘name’: ‘Ajay’, ‘age’: 21, ‘per’: 99}
{‘roll’: 500, ‘name’: ‘komal’, ‘age’: 21, ‘per’: 99}
{‘roll’: 500, ‘name’: ‘komal’, ‘age’: 25, ‘per’: 99}
{‘roll’: 500, ‘name’: ‘komal’, ‘age’: 25, ‘per’: 100}

n={"roll":101,"name":"Ajay","age":21,"per":99}
print(n)
n["roll"]=500
print(n)
n["name"]="komal"
print(n)
n["age"]=25
print(n)
n["per"]=100
print(n)

Output:

{'roll': 101, 'name': 'Ajay', 'age': 21, 'per': 99}
{'roll': 500, 'name': 'Ajay', 'age': 21, 'per': 99}
{'roll': 500, 'name': 'komal', 'age': 21, 'per': 99}
{'roll': 500, 'name': 'komal', 'age': 25, 'per': 99}
{'roll': 500, 'name': 'komal', 'age': 25, 'per': 100}
>>> 

Example:2

n={“accno”:1001,”name”:”Sanjay”,”Balance”:36000}
print(n)
n[“accno”]=5000
print(n)
n[“name”]=”Kapil”
print(n)
n[“Balance”]=50000
print(n)

Output:

{‘accno’: 1001, ‘name’: ‘Sanjay’, ‘Balance’: 36000}
{‘accno’: 5000, ‘name’: ‘Sanjay’, ‘Balance’: 36000}
{‘accno’: 5000, ‘name’: ‘Kapil’, ‘Balance’: 36000}
{‘accno’: 5000, ‘name’: ‘Kapil’, ‘Balance’: 50000}
>>>

n={"accno":1001,"name":"Sanjay","Balance":36000}
print(n)
n["accno"]=5000
print(n)
n["name"]="Kapil"
print(n)
n["Balance"]=50000
print(n)

Output:

{'accno': 1001, 'name': 'Sanjay', 'Balance': 36000}
{'accno': 5000, 'name': 'Sanjay', 'Balance': 36000}
{'accno': 5000, 'name': 'Kapil', 'Balance': 36000}
{'accno': 5000, 'name': 'Kapil', 'Balance': 50000}
>>> 

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