Programming in Python/

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Basic Dictionary Operations

Basic Dictionary Operations

Learn about basic dictionary operations in Python.

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Different operations in the dictionary

Some basic dictionary operations are given below.

Mutability

Dictionaries are mutable. So we can perform add, delete, and modify operations on a dictionary.

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courses = { 'CS101' : 'CPP', 'CS102' : 'DS', 'CS201' : 'OOP',
             'CS226' : 'DAA', 'CS601' : 'Crypt', 'CS442' : 'Web'}
# add, modify, delete
courses['CS444'] = 'Web Services'   # add new key-value pair
courses['CS201'] = 'OOP Using java' # modify value for a key
del(courses['CS102']) # delete a key-value pair
del(courses)          # delete dictionary object
print(courses) # We will get an error "NameError: name 'courses' is not defined".

Note: Any new additions will take place at the end of the existing dictionary because dictionaries preserve the insertion order. Dictionary keys cannot be changed in place. ...