Unit4-Basic concepts of Dictionary Looping.pptx

Refer this to understand Looping Concepts in dictionary

1. Dictionary By, Prof. S.S.Gawali Computer Engineering, Sanjivani College of Engineering Sanjivani Rural Education Society’s Sanjivani College of Engineering, Kopargaon-423 603 Department of Computer Engineering

2. What is Dictionary? Dictionary is mapping data type in python. Dictionary is a data structure which store values as a pair of key and value. In dictionary keys are unique and immutable. In dictionary values are not unique but mutable. Department of Computer Engineering, Sanjivani College of Engineering, Kopargaon 2

3. Dictionary Looping Dictionary looping means visiting elements (key, value or item) in the dictionary. ‘for’ loop use to loop through the dictionary. There are three different way to loop dictionary: By visiting only keys By visiting only values By visiting Items (Key and Values at atime ) Department of Computer Engineering, Sanjivani College of Engineering, Kopargaon 3

4. Loop to print keys in Dictionary Printing all keys of dictionary stud={'rollno':1, ' name':'Soham ', ' class':'FY '} for key in stud: #for loop to visit keys print(key) #printing keys Department of Computer Engineering, Sanjivani College of Engineering, Kopargaon 4 Output: rollno name class

5. Loop to print keys in Dictionary stud={'rollno':1, ' name':'Soham ', ' class':'FY '} for val in stud.values (): #loop to work with values in dict print( val ) # display value Department of Computer Engineering, Sanjivani College of Engineering, Kopargaon 5 Output: 1 Soham FY

6. Loop to print items (Key, Value) in Dictionary stud={'rollno':1, ' name':'Soham ', ' class':'FY '} for i in stud.items (): # loop to visit items in dict print( i ) # display item as tuple Department of Computer Engineering, Sanjivani College of Engineering, Kopargaon 6 Output: (' rollno ', 1) ('name', 'Soham') ('class', 'FY')

7. Loop to print items (Key, Value) in Dictionary stud={'rollno':1, ' name':'Soham ', ' class':'FY '} for key,value in stud.items (): #loop to consider key and values separatetly print( key,value ) # display key and its value Department of Computer Engineering, Sanjivani College of Engineering, Kopargaon 7 Output: rollno 1 name Soham class FY

8. Thank You…. Department of Computer Engineering, Sanjivani College of Engineering, Kopargaon 8