Python Accessing elements of dictionary-all keys() all values() all items()

Python Accessing elements of dictionary-all keys() all values() all items() 

#Accessing elements of dictionary

emp={"empname":"krishna","jobdesc":"software programmer","salary":34000}

print(emp['empname'])    #access value using name

print(emp.get('salary')) #get key value using key name in get function

#get all keys and values

#keys(): return the list of all keys in present dictionary

#ex:

emp={"empname":"krishna","jobdesc":"software programmer","salary":34000}

print(emp.keys())

print(type(emp.keys()))

#values():return the list of all values in present dictionary

#ex:

emp={"empname":"krishna","jobdesc":"software programmer","salary":34000}

print(emp.values())

print(type(emp.values()))

#items():return all the items present in the dictionary. each item will be inside a tuple as a      key-value pair.

emp={"empname":"krishna","jobdesc":"software programmer","salary":34000}

print(emp.items())

print(type(emp.items()))

#Iterating a dictionary:

emp={"empname":"krishna","jobdesc":"software programmer","salary":34000}

for x in emp:

    print(x)

note:it will display only keys

emp={"empname":"krishna","jobdesc":"software programmer","salary":34000}

print('key', ':', 'value')

for key in emp:

    print(key, ':', emp[key])

# using items() method

print('key', ':', 'value')

for key_value in emp.items():

    print(key_value[0], key_value[1])

#find the length of the dictionary

emp={"empname":"krishna","jobdesc":"software programmer","salary":34000}

print(len(emp))

#adding new keys in dictionary 

emp={"empname":"krishna","jobdesc":"software programmer","salary":34000}

emp["empno"]=101 #single item adding

print(emp)

emp.update({"doj":"12/09/2022","company":"google"})

print(emp)

#python dictionary,#dictionary keys(),#dictionary values(),#dictionary items(),
#python datatypes,#python dict(),#dictionary accessing elements,#all keys(),#all vlaues(), #all items()

Adding and changing elements in a tuple using insert() and append methods

 Adding and changing elements in a tuple using insert and append:

A list is a mutable type, which means we can add or modify values in it,

but tuples are immutable, so they cannot be changed.

#how to add new element in tuple object using index based

tup=(6,75,66,34,23)

print(tup) #print all tuple elements

newlist=list(tup) #tuple to list convert

newlist.insert(2,40) #add new element in list

tup=tuple(newlist) #convert list to tuple

print(tup) #print all elements in tuple

output:

(6, 75, 66, 34, 23)

(6, 75, 40, 66, 34, 23)

#how to add new element in tuple object using apped() method

tup=(6,75,66,34,23)

newlist=list(tup)

newlist.append(22)

tup=tuple(newlist)

print(tup)

output:

(6, 75, 66, 34, 23, 22)

#Modify nested items of a tuple:

then we can change its values in the case of a nested tuple.

Ex:

tuple1 = (10, 20, [25, 75, 85])

print(tuple1)

tuple1[2][0] = 250

print(tuple1)

output:

(10,20,[250,75,85])

    

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How to check the length of the elements in python list object

# How to check the length of the elements in python list object using len() function

Length of a List

In order to find the number of items present in a list, we can use the len() function.

Ex:

list=[20,33,44,55,"ramesh","rani",56.88]

print(len(list))

# print secod index to upto end of the list values using len() function

Ex:

list=[20,33,44,55,"ramesh","rani",56.88]

for x in range(2,len(list)):

    print(list[x])