Dictionaries in python with example

In this chapter, you will learn about, dictionaries in python with examples.

1. Dictionaries store an object’s with key-value pairs
2. The value of properties can be accessed with the help of key
3. Dictionaries can be defined with curly braces
4. Dictionaries are unordered
5. Dictionaries cannot be sorted

Now let’s create a dictionary in python,

employeeDetails = {
    'name': 'John',
    'department':'IT',
    'email':'john@email.com'
}

print(employeeDetails)

# output
# {'department': 'IT', 'name': 'John', 'email': 'john@email.com'}

Now let’s see how to access the value with the help of key

employeeDetails = {
    'name': 'John',
    'department':'IT',
    'email':'john@email.com'
}

print(employeeDetails)
# now let access the element 
print('Employee name : '+ employeeDetails['name'])
# output
# {'department': 'IT', 'name': 'John', 'email': 'john@email.com'}
# Employee name : John

Use the key to access the value, no matter how depth the nested objects are, for example for accessing

employees = {
    'names': ['John','Stark','Mickel'],
    'id':[123,456,234],
    'address': {'home':'78, street no 1', 'office':'45, street no 4'}
}

print(employees)

# access home address
print('Home address : '+employees['address']['home'])
# output
# {'address': {'home': '78, street no 1', 'office': '45, street no 4'}, 'names': ['John', 'Stark', 'Mickel'], 'id': [123, 456, 234]}
# Home address : 78, street no 1

You can use the method keys() and values() in order to get all keys in the dictionary and values, let’s see an example

employees = {
    'names': ['John','Stark','Mickel'],
    'id':[123,456,234],
    'address': {'home':'78, street no 1', 'office':'45, street no 4'}
}

# access home address
print('Printing keys...')
print(employees.keys())
print('Printing values')
print(employees.values())

# output
# Printing keys...
# ['address', 'names', 'id']
# Printing values
# [{'home': '78, street no 1', 'office': '45, street no 4'}, ['John', 'Stark', 'Mickel'], [123, 456, 234]]