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 in python

dict = {"apple": "fruit", "ball": "object", "cricket": "sports"}

#how to print?

print(dict["cricket"])

how to use dictionary in python

#dictionary
programming = {
    "Bugs": "These are the places of code which dose not let your program run successfully"
    ,"Functions":"This is a block in which you put a peice of code"
    ,"shell":"This is a place where the code is exicuted"
    }
print(programming["Bugs"])
print(programming["shell"])
#error
#print(programming["pugs"])

dictionary in python

Polygon = {
	"PolygonName" : "Tetrahectaseptadecagon"
	"PolygonSides" : 417
}

print("A", (Polygon["PolygonName"]) "has", (Polygon["PolygonSides"]), "sides")

dictionary in python

my_dict = {"key": "value", "a": 1, 2: "b"}
print(my_dict["key"])
# Output: value
print(my_dict["a"])
# Output: 1
print(my_dict[2])
# Output: b

dictionary in python

thisdictionary = {'key':'value','key1':'value1'}
print(thisdictionary['key'])

dictionary in python

# Dictionaries in Python are used to store set of data like Key: Value pair

# the syntax of a dictionary in Python is very simple we use {} inside that
	# we define {Key: Value}, to separate multiple values we use','
programming_dictionary = {
    "Bug": "An error in a program that prevents the program from running as expected.",
  
    "Function": "A piece of code that you can easily call over and over again.",
  
  	"Loop": "The action of doing sommething again and again",
}
# to retrieve the values from a dictionary we use the Key name as an Index
# retrieving the Function's definition
print(programming_dictionary["Function"])	# this will print the definition of Function

# if you wanna print all the entries in the dictionary you can do that by for loop
for key in programming_dictionary:
  print(programming_dictionary[key])	# prints all entries
  
# adding items to a dictionary
# the following code will add another entry to the dictionary called Variable
programming_dictionary["Variable"] = "The label to store some sort of data"
print(programming_dictionary["Variable"])

# editing the values of a key 
# editing the value of variable
programming_dictionary["Variable"] = "Variables are nothing but reserved memory locations to store values. This means that when you create a variableyou reserve some space in memory"

# if you learnt something from this please upvote it

dictionary in python

# Dictionaries in Python

ages = {"John": 43, "Bob": 24, "Ruth": 76} # Marked by { at beginning and a } at end

# ^^^ Has sets of keys and values, like the 'John' and 43 set. These two values must be seperated by a colon

# ^^^ Sets of values seperated by commas.

dictionary in python

#A dictionary has key-value pairs. Here 1,2,3 are the keys and Item1,Item2,Item3 
#are their values respectively. 
dictionaryName = { 1: "Item1", 2: "Item2", 3: "Item3"}

#retrieving value of a particular key
dictionaryName[1]

#retrieving all the keys in a dictionary
dictionaryName.keys()

#retrieving all the values in a dictionary
dictionaryName.values()

dictionary in python

#a dictionary
dict = {
  "key": "value",
  "other_key": "value"
}

#get a value from the dictionary using the key
print(dict["key"])

#you can also get a value from the dictionary using a normal index:
print(dict[1])

dictionary in python

myDict = {
    "Fast": "In a Quick Manner",
    "Hasya": "A Coder",
    "Marks": [1, 2, 5],
    "anotherdict": {'hasya': 'Player'}
}

# print(myDict['Fast'])
# print(myDict['Hasya'])
myDict['Marks'] = [45, 78]
print(myDict['Marks'])
print(myDict['anotherdict']['hasya'])

how to define a dictionary in python

population = {"Shanghai":17.8, "Istanbul":13.3, "Karachi":13.0, "Mumbai":12.5}

#Consider the following when creating a dictionary
#	1. Must be inside {}
#	2. Have two parts in an item 
#			Key - e.g. Istanbul and Value - e.g. 13.3
#	3. There must be a colon ":" between the key and the value
#	4. Item must be seperated by commas ","
#	3. Any immutable type can be used as keys (not only integers like in lists)

dictionary in python

shapes={"square": 90, "triangle": 60}

Dictionary in python

dict1={1:"Tutorials",2:"Point",3:1116}
print("Dictionary 1",dict1)
dict2={1:"TutorialsPoint","TP":"DictionaryTutorial"}
print("Dictionary 2",dict2)

dictionary in python

Dict = {"name": 'Izhaan', "salary": 1234, "age": 23} 
print("
Dictionary with the use of string Keys: ") 
print(Dict)

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)