Dictionary_python

#####Python Dictionary ####

Python dictionary is an unordered collection of items. Each item of a dictionary has a "KEY/VALUE" pair.

Accessing Elements from Dictionary using keys(), items() and values().


my_dict = {'name': 'Jack', 'age': 26, 'location': 'London' }


print(my_dict['name'])       ##Here name is key in dictionary my_dict
# Output: Jack


print(my_dict.get('age'))    ## here age is KEY in dictionary my_dict , get can also be used to fetch value
# Output: 26



my_dict = {'name': 'Jackie Chain', 'age': 26, 'location': 'London' }
for x in my_dict.values():
	print(x)

Output:   ## here we are using VALUES keyword to get values from the (key-pair)

  Jackie Chain
  26
  London



  my_dict = {'name': 'Jackie Chain', 'age': 26, 'location': 'London' }
  for x,y in my_dict.items():
  	print(x)


Output:  ## here we are using ITEMS function to get key value pairs

name Jackie Chain
age 26
location London






####Changing and Adding Dictionary elements

If the key is already present, then the existing value gets updated.
 In case the key is not present, a new (key: value) pair is added to the dictionary.

EXAMPLE 1:

 my_dict = {'name': 'Jack', 'age': 26}

# update value
my_dict['age'] = 27

print(my_dict)

# add item
my_dict['address'] = 'Downtown'

print(my_dict)

OUTPUT:

{'name': 'Jack', 'age': 27}
{'name': 'Jack', 'age': 27, 'address': 'Downtown'}

EXAMPLE 2:

dict = {'one': 1, 'two': 2, 'three': 3}
dict2 = {'one': 1, 'two': 5, 'four': 8}
dict.update(dict2)
print(dict)

OUTPUT:

{'one': 1, 'two': 5, 'three': 3, 'four': 8}