PYTHON

how to use dictionaries in python

student_data = {
  "name":"inderpaal",
  "age":21,
  "course":['Bsc', 'Computer Science']
}

#the keys are the left hand side and the values are the right hand side
#to print data you do print(name_of_dictionary['key_name'])

print(student_data['name']) # will print 'inderpaal'
print(student_data['age']) # will print 21
print(student_data['course'])[0]
#this will print 'Bsc' since that field is an array and array[0] is 'Bsc'

dictionary python

# dictionary refresh


new_dict = {
    "first":"1,2,3",
    "second":"321",
    "third":"000",
}


# adding to dictionary
new_dict.update({"fourth":"D"})
print(new_dict)

#removing from dictionary
new_dict.pop("first")
print(new_dict)


new = {"five":"888"}
#updating a dictionary
new_dict.update(new)
print(new_dict)

python dict

<view> = <dict>.keys()                          # Coll. of keys that reflects changes.
<view> = <dict>.values()                        # Coll. of values that reflects changes.
<view> = <dict>.items()                         # Coll. of key-value tuples that reflects chgs.
value  = <dict>.get(key, default=None)          # Returns default if key is missing.
value  = <dict>.setdefault(key, default=None)   # Returns and writes default if key is missing.
<dict> = collections.defaultdict(<type>)        # Creates a dict with default value of type.
<dict> = collections.defaultdict(lambda: 1)     # Creates a dict with default value 1.
<dict> = dict(<collection>)                     # Creates a dict from coll. of key-value pairs.
<dict> = dict(zip(keys, values))                # Creates a dict from two collections.
<dict> = dict.fromkeys(keys [, value])          # Creates a dict from collection of keys.
<dict>.update(<dict>)                           # Adds items. Replaces ones with matching keys.
value = <dict>.pop(key)                         # Removes item or raises KeyError.
{k for k, v in <dict>.items() if v == value}    # Returns set of keys that point to the value.
{k: v for k, v in <dict>.items() if k in keys}  # Returns a dictionary, filtered by keys.

dicts python

thisdict =	{
  "brand": "Ford",
  "model": "Mustang",
  "year": 1964
}
x = thisdict["model"]
print(x)
---------------------------------------------------------------------------
Mustang

dictionary python

dictionary = {
    "name": "Elie",
    "family name": "Carcassonne",
    "date of born": "01/01/2001",
    "list": ["hey", "hey"]
}

dict python

a = {'a': 123, 'b': 'test'}

python dict

mydictionary = {'name':'python', 'category':'programming', 'topic':'examples'}

for x in mydictionary:
	print(x, ':', mydictionary[x])

python dict

# A dict (dictionary) is a data type that store keys/values

myDict = {"name" : "bob", "language" : "python"}
print(myDict["name"])

# Dictionaries can also be multi-line
otherDict {
	"name" : "bob",
    "phone" : "999-999-999-9999"
}

python Dictionaries

#Python dictionaries consists of key value pairs tha
#The following is an example of dictionary
state_capitals = {
    'Arkansas': 'Little Rock',
    'Colorado': 'Denver',
    'California': 'Sacramento',
    'Georgia': 'Atlanta'
}

#Adding items to dictionary
#Modification of the dictionary can be done in similar maner
state_capitals['Kampala'] = 'Uganda' #Kampala is the key and Uganda is the value

#Interating over a python dictionary
for k in state_capitals.keys():
    print('{} is the capital of {}'.format(state_capitals[k], k))

Python Dictionaries

thisdict = {
  "brand": "Ford",
  "model": "Mustang",
  "year": 1964
}
print(thisdict["brand"])

python dict

>>> d = {}
>>> d
{}
>>> d = {'dict': 1, 'dictionary': 2}
>>> d
{'dict': 1, 'dictionary': 2}

dictionaries in python

# Creating a Nested Dictionary
# as shown in the below image
Dict = {1: 'Geeks', 2: 'For',
        3:{'A' : 'Welcome', 'B' : 'To', 'C' : 'Geeks'}}
 
print(Dict)