Python Dictionary Problems

Python Dictionary Practice Problems.

Move items from one dictionary to another.

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In this python dictionary program, we will move items from one dictionary to another dictionary.

Steps to solve the program
  1. Take one dictionary as input and create another empty dictionary.
  2. Use for loop to iterate over input dictionary.
  3. Add values from the input dictionary to the empty dictionary.
  4. Print the output.
				
					dict1 = {'name':'john','city':'Landon','country':'UK'}
dict2 = {}
temp = dict1.copy()

for val in temp:
    v1 = dict1.pop(val)
    dict2[val] = v1

print("dictionary 2 :", dict2)
print("dictionary 1 :", dict1)

Output :

				
					dictionary 2 : {'name': 'john', 'city': 'Landon', 'country': 'UK'}
dictionary 1 : {}
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print the square of all values in a dictionary.

Next

concatenate two dictionaries

Print the square of all values in a dictionary.

by

In this python dictionary program, we will print the square of all values in a dictionary.

Steps to solve the program
  1. Take a dictionary as input.
  2. Use for loop to iterate over the dictionary.
  3. During iteration print the key and square of its value using **2.
  4. Print the output.
				
					dictionary = {'a': 5, 'b':3, 'c': 6, 'd': 8}

for val in dictionary:
    print(val,":", dictionary[val]**2)

Output :

				
					a : 25
b : 9
c : 36
d : 64
Previous

add elements to the dictionary.

Next

move items from dict1 to dict2.

Python program to add elements to the dictionary. 

by

In this python dictionary program, we will add elements to the dictionary.

Steps to solve the program
  1. Create an empty dictionary by using {}.
  2. Add elements to the dictionary.
  3. To add elements use the following format: Dictionary_name[key_name] = value.
  4. Print the output.

Output :

				
					dictionary = {}
dictionary["Name"] = "Ketan"
dictionary["Age"] = "21"

print(dictionary)
				
			
				
					{'Name': 'Ketan', 'Age': '21'}
Next

print the square of all values in a dictionary.

Python Dictionary Practice Programs, Exercises

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Python dictionary programs are used to create dictionaries as well as to search for specific entries in them. Dictionaries can be created by assigning key-value pairs for each entry in the program code. This dictionary program in python for practice help user to get expertise in dictionary fundamentals.

1). Python Dictionary program to add elements to the dictionary.

Solution

2). Python Dictionary program to print the square of all values in a dictionary.
Input : {‘a’: 5, ‘b’:3, ‘c’: 6, ‘d’ : 8}
Output :
a : 25
b : 9
c : 36
d : 64

Solution

3). Python Dictionary program to move items from dict1 to dict2.
Input :
dict1 = {‘name’: ‘john’, ‘city’: ‘Landon’, ‘country’: ‘UK’}
dict2 = {}
Output :
dict1 = {}
dict2 = {‘name’: ‘john’, ‘city’: ‘Landon’, ‘country’: ‘UK’}

Solution

4). Python Dictionary program to concatenate two dictionaries.
Input :
dict1 = {‘Name’: ‘Harry’, ‘Rollno’:345, ‘Address’: ‘Jordan’}
dict2 = {‘Age’ : 25, ‘salary’: ‘$25k’}
Output :
dict1 = {‘Name’: ‘Harry’, ‘Rollno’:345, ‘Address’: ‘Jordan’, ‘Age’ : 25, ‘salary’: ‘$25k’}

Solution

5). Python Dictionary program to get a list of odd and even keys from the dictionary.
Input :
{1: 25, 5:’abc’, 8:’pqr’, 21:’xyz’, 12:’def’, 2:’utv’}
Output :
Even Key = [[8, ‘pqr’], [12, ‘def’], [2, ‘utv’]]
Odd Key = [[1, 25], [5, ‘abc’], [21, ‘xyz’]]

Solution

6). Python Dictionary Program to create a dictionary from two lists.
Input :
list1 = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’]|
list2 = [12, 23, 24, 25, 15, 16]
Output :
{‘a’: 12, ‘b’: 23, ‘c’: 24, ‘d’: 25, ‘e’: 15}

Solution

7). Python Dictionary program to store squares of even and cubes of odd numbers in a dictionary using dictionary comprehension.
Input :
[4, 5, 6, 2, 1, 7, 11]
Output :
{4: 16, 5: 125, 6: 36, 2: 4, 1: 1, 7: 343, 11: 1331}

Solution

8). Python Dictionary program to clear all items from the dictionary.

Solution

9). Python Dictionary program to remove duplicate values from Dictionary.
Input :
{‘a’: 12, ‘b’: 2, ‘c’: 12, ‘d’: 5, ‘e’: 35, ‘f’: 5}
Output :
{‘a’: 12, ‘b’: 2, ‘d’: 5, ‘e’: 35}

Solution

10). Python Dictionary program to create a dictionary from the string.
Input  = ‘SQATools’
Output = {‘S’: 1, ‘Q’: 1, ‘A’: 1, ‘T’: 1, ‘o’: 2, ‘l’: 1, ‘s’: 1}

Solution

11). Python Dictionary program to sort a dictionary using keys.
Input = {‘d’ : 21, ‘b’ : 53,  ‘a’: 13, ‘c’: 41}
Output =
(‘a’, 13)
(‘b’, 53)
(‘c’, 41)
(‘d’, 21)

Solution

12). Python Dictionary program to sort a dictionary in python using values.
Input = {‘d’ : 14, ‘b’ : 52,  ‘a’: 13, ‘c’: 1 }
Output= (c, 1) (a,13) (d, 14) (b, 52)

Solution

13). Python Dictionary program to add a key in a dictionary.
Input= {1:’a’, 2:’b’}
Output= (1:’a’, 2:’b’, 3:’c’}

Solution

14). Python Dictionary program to concatenate two dictionaries.
Input:
D1 = {‘name’ : ’yash’, ‘city’ :  ‘pune’}
D1 = {‘course’ : ’python’, ‘institute’ : ’sqatools’}
Output :
{ ‘name’ : ’yash’, city: ‘pune’, ‘course’ : ’python’, ‘institute’ : ’sqatools’ }

Solution

15). Python Dictionary program to swap the values of the keys in the dictionary.
Input = {name:’yash’, city: ‘pune’}
Output = {name:’pune’, city: ‘yash’}

Solution

16). Python Dictionary program to get the sum of all the items in a dictionary.
Input = {‘x’ : 23, ‘y’ : 10 , ‘z’ : 7}
Output = 40

Solution

17). Python program to get the size of a dictionary in python.
Hint : use sys.getsizeof(var) method.
Input = {‘name’ : ’virat’, ‘sport’ : ’cricket’}
Output = 232bytes

Solution

18). Python Dictionary program to check whether a key exists in the dictionary or not.
Input:
Dict1 = {city:’pune’, state=’maharashtra’}
Dict1[country]
Output= ‘key does not exist in dictionary

Solution

19). Python program to iterate over a dictionary.
Input :
Dict1 = {food:’burger’, type:’fast food’}
Output :
food : burger
type : fast food

Solution

20). Python Dictionary program to create a dictionary in the form of (n^3) i.e. if key=2 value=8
Input: n=4
Output ={1 : 1, 2 : 8, 3 : 27, 4 : 64}

Solution

21). Python Dictionary program to insert a key at the beginning of the dictionary.
Input = { ‘course’ : ’python’,  ‘institute’ : ’sqatools’ }
Insert : ( ‘name’ : ’omkar’ )
Output= { ‘name’ : ’omkar’, ‘course’ : ’python’, ‘institute’ : ’sqatools’}

Solution

22). Python Dictionary  program to create a dictionary where keys are between 1 to 5 and values are squares of the keys.
Output ={1 : 1, 2 : 4, 3 : 9, 4 : 16, 5 : 25}

Solution

23). Python Dictionary program to find the product of all items in the dictionary.
Input = { ‘a’ : 2, ‘b’ : 4, ‘c’ : 5}
Output = 40

Solution

24). Python Dictionary program to remove a key from the dictionary.
Input = {a:2,b:4,c:5}
Output = (a:1,b:4}

Solution

25). Python Dictionary program to map two lists into a dictionary.
Input : 
a = [ ‘name’, ‘sport’, ‘rank’, ‘age’]
b = [‘Virat’, ‘cricket’, 1,  32]
Output =  { ‘name’ : ’virat’, ‘sport’ : ’cricket’, ‘rank’: 1, ‘age’ : 32}

Solution

26). Python Dictionary program to find maximum and minimum values in a dictionary.
Input :
Dict = { ‘a’ : 10, ‘b’ : 44 , ‘c’ : 60, ‘d’ : 25}
Output :
Maximum value: 60
Minimum value: 10

Solution

27). Python Dictionary program to group the same items into a dictionary value.
Input :
list = [1,3,4,4,2,5,3,1,5,5,2,]
Output = {1 : [1, 1], 2 :[2, 2], 3 : [3, 3], 4 : [4, 4], 5 : [5, 5, 5]}

Solution

28). Python Dictionary program to replace words in a string using a dictionary.
String = ’learning python at sqa-tools’
Dict = { ‘at’ : ’is’, ‘sqa-tools’ : ’fun’}
Output = ‘learning python is fun’

Solution

29). Python Dictionary program to remove a word from the string if it is a key in a dictionary.
String = ’sqatools is best for learning python’
Dict = { ‘best’ : 2, ‘learning’ : 6}
Output = “sqatools is for python”

Solution

30). Python Dictionary program to remove duplicate values from dictionary values.
Input:
Dict1 = { ‘marks1’ : [23,28,23,69], ‘marks2’ : [ 25, 14,25] }
Output= { ‘marks1’ : [28, 69], ‘marks2’ : [14,19] }

Solution

31). Python Dictionary program to check whether a dictionary is empty or not.
Input:
Dict1 = {}
Output: Given dictionary is empty

Solution

32). Python Dictionary program to add two dictionaries if the keys are the same then add their value.
Input:
Dict1 = { ‘x’:10, ‘y’:20, ‘c’:50, ‘f’:44 }
Dict2 = {‘x’:60,’c’:25,’y’:56}
Output = {‘x’: 70, ‘c’: 75, ‘y’: 76}

Solution

33). Python Dictionary program to print all the unique values in a dictionary.
Input :
Dict1 = [{name1:’robert’},  {name2:’john’}, {name3:’jim’}, {name4:’robert’}]
Output = [‘robert’, ’john’, ’jim’]

Solution

34). Python Dictionary program to display different combinations of letters from dictionary values.
Input:
Dict1 = { x:[e,f], y:[a,b]}
Output: 
  ea
  eb
  fa
  fb

Solution

35). Python Dictionary program to create a dictionary from a string.
Input = ‘sqatools’
Output = {s:2,q:1,a:1, t:1,o:2, l:1}

Solution

36). Python Dictionary program to print the given dictionary in the form of tables.
Input:
Dict1= {names:[‘virat’,’messi’,’kobe’], sport:[‘cricket’,’football’,’basketball’]}
Output:
     Names   sport
0    Virat      cricket
1    Messi     football
2    Kobe      basketball

Solution

37). Python program to count frequencies in a list using a dictionary.
Input:
list1= [2,5,8,1,2,6,8,5]
Output = {1:1,2:2, 5:2, 6:1, 8:2}

Solution

38). Python program to find mean of values of keys in a dictionary.
Input :
Dict1= {m1:25, m2:20, m3:15}
Output :
Mean is 20

Solution

39). Python program to convert a list into a nested dictionary of keys.
Input = [a,b,c,d]
Output = {a: {b: {c: {d: {}}}}}

Solution

40). Python program to sort a list of values in a dictionary.
Input= { a1 : [1,5,3], a2 : [10,6,20] }
Output= ( a1 : [1,3,5], a2 : [6,10,20] }

Solution

41). Python program to get a product with the highest price from a dictionary.
Input = { ‘price1’ : 450, ‘price2‘ : 600,  ‘price3′ : 255,  ‘price4′ : 400}
Output = P2 500

Solution

42). Python program to print a dictionary line by line.
Input = {‘virat’: {sport:’cricket’, team:’india’}, ‘messi’: {sport:’football’, team:’argentina’}}
Output=
Virat
Sport : cricket
Team : india

Messi
Sport : football
Team : argentina

Solution

43). Python program to convert a key value list dictionary into a list of list.
Input = {sqa:[1,4,6], tools:[3,6,9]}
Output= [[sqa,1,4,6],[tools,3,6,9]]

Solution

44). Python program to convert a list of dictionaries to a list of lists.
Input= [{‘sqa’:123,’tools’:456}]
Output= [[sqa],[tools],[123],[456]]

Solution

45). Python program to count a number of items in a dictionary value that is in a list.
Input = {‘virat’:[‘match1’,match2’,’match3’], ‘rohit’:[‘match1’,’match2’]}
Output= 5

Solution

46). Python program to sort items in a dictionary in descending order.
Input = {‘Math’:70, ‘Physics’:90, ‘Chemistry’:67}
Output = {‘Physics’:90, ’Maths’:70, ’Chemistry’:67}

Solution

47). Python program to replace dictionary values with their average.
Input = { name:’ketan’, subject:’maths’, p1:80, p2:70}
Output = { name:’ketan’,subject:’maths’, p1+p2:75}

Solution

48). Python program to match key values in two dictionaries.
Input: 
A = {‘k1’: p, ‘k2’: q, ‘k3’: r}
B = {‘k1’: p, ‘k2’: s}

Output = k1: p is present in both A and B

Solution

49). Python program to create a dictionary of keys a, b, and c where each key has as value a list from 1-5, 6-10, and 11-15 respectively. 
Output = { a: [1,2,3,4,5],  b: [6,7,8,9,10],  c: [11,12,13,14,15] }

Solution

50). Python program to drop empty Items from a given dictionary.
Input = {‘m1’:40, ‘m2’:50, ‘m3’:None}
Output = {‘m1’:40, ‘m2’:50}

Solution

51). Python program to filter a dictionary based on values.
Input= { ‘alex’ : 50,  ‘john’ : 45, ‘Robert’ : 30}
Output= value greater than 40
{alex:50, john:45}

Solution

52). Python program to convert a key-values list to a flat dictionary.
Input = {‘name’: [‘Apr’, ‘May’, ‘June’], ‘month’: [4, 5, 6]}
Output ={‘Apr’: 4, ‘May’: 5, ‘June’: 6}

Solution

53). Python program to convert a list of Tuples into a dictionary
Input =  [(“mike”, 1), (“Sarah”, 20), (“Jim”, 16)]
Output = {“mike”:1, “Sarah”:20, “Jim”:16}

Solution

54). Python program to convert string to the dictionary.
Input:
str1= “Apr=April; Mar=March”
Output: {‘Apr’: ‘April’, ‘ Mar’: ‘March’}

Solution

55). Python program to convert a matrix into a dictionary.
Input = [[1,2,3],[4,5,6]]
Output= {1 : [1,2,3] , 2 : [4,5,6]}

Solution

56). Python program to check all values are the same in a dictionary.
Input :
A={‘virat’:50, ’rohit’:50, ’rahul’:50, ’hardik’:50}    
Output : True

Solution

57). Python program to create a dictionary grouping a sequence of key-value pairs into a dictionary of lists.
Input :
A= {‘virat’:50, ’rohit’:40, ’virat’:30, ’rohit’:10}
Output = {‘virat’:[50,30],’rohit’:[40,10]}

Solution

58). Python program to split a given dictionary of lists into list of dictionaries.
Input :
A={ ‘t20’ : [50,40,30,45], ‘odi’ : [70,10,0,65] }
Output :
[ {t20:50, odi:70} ,{t20:40, odi:10}, {t20:30, odi:0}, {t20:45, odi:65} ]

Solution

59). Python program to remove a specified dictionary from a given list.
Input = [ { t20:50, odi:70 }, { t20:40, odi:10 }, { t20:30,odi:0 }, { t20:45, odi:65} ]
Remove 4th dictionary
Output=[ { t20:50, odi:70 }, { t20:40, odi:10 } ,{ t20:30, odi:0 } ]

Solution

60). Python program to convert string values of a given dictionary, into integer/float datatypes.
Input :
A = { ‘a’: ’30’,  ‘b’: ’20’, ‘c: ’10’ } 
B=  { ‘a’: ‘3.33’, ‘b’: ‘20.50’, ‘c: ‘12.5’ }
Output : 
A = { ‘a’: 30, ‘b’: 20, ‘c: 10 } 
B = { ‘a’: 3.33, ‘b’: 20.50, ‘c: 12.5 } 

Solution

61).  A Python dictionary contains a list as a value. Python program to clear the list values in the said dictionary.
Input={‘virat’:[50,30],’rohit’:[40,10]} 
Output= { ‘virat’: [], ’rohit’: [] }

Solution

62). A Python dictionary contains list as value. Python program to update the list values in the said dictionary.
Input = { ‘virat’ : [ 50,30 ], ’rohit’ : [ 40,10 ] }
Output ={‘virat’: [60, 40], ‘rohit’: [15, -15]}

Solution

63). Python program to extract a list of values from a given list of dictionaries
Input:
A=[ { t20:50, odi:70 }, { t20:40, odi:10 }, { t20:30, odi:0 }, { t20:45, odi:65 } ]
Extract values for ‘odi’
Output = [70,10,0,65]

Solution

64). Python program to find the length of dictionary values.
Input = { 1:’sqa’, 2:’tools’, 3:’python’ }
Output= { ‘sqa’:3, ’tools’:5, ‘python’:6 }

Solution

65). Python program to get the depth of the dictionary.
Input = {‘a’:1, ‘b’: {‘c’: {‘d’: {}}}}
Output : 4

Solution

66). Python program to create nested Dictionary using List.
Input = {‘sqatools’:8,’python’:6} list=[1,2]
Output= { 1: { sqatools’:8 }, 2:[‘python’:6] }

Solution

67). Python program to extract key’s value if key is present in list and dictionary
Input:
A = [‘sqatools’,’is’,’best’]
B = {‘sqatools’:10}
Output = 10

Solution

68). Python program to remove keys with values greater than n.
Input = { ‘sqa’:3, ’tools’:5, ‘python’:7 } 
n=6
Output = {‘sqa’:3,’tools’:5}

Solution

69). Python program to remove keys with substring values.
Input :
D1 = { 1:’sqatools is best’, 2: ’for learning python’}
Substr = [‘best’,’ excellent’]
Output = { 2:  ’for learning python’ }

Solution

70). Python program to access the dictionary key.
Input :
Drinks = { pepsi:50, sprite:60, slice:55}
Output:
Pepsi
Sprite
Slice

Solution

71). Python program to filter even numbers from a given dictionary value.
Input = { ‘a’: [11, 4, 6, 15],  ‘b’: [3, 8, 12],  ‘c’: [5, 3, 10] }
Output = { ‘a’:[4,6], ’b’:[8,12],  ’c’:[10] }

Solution

72). Python program to find the keys of maximum values in a given dictionary.
Input = { a:18, b:50, c:36, d:47, e:60 }
Find keys of first 2 max values from the dictionary
Output = [ e, b ]

Solution

73). Python program to find the shortest list of values with the keys in a given dictionary.
Input = { ‘a’: [10, 12], ‘b’: [10],  ‘c’: [10, 20, 30, 40], ‘d’: [20] }
Output = [ ‘b’, ’d’ ]

Solution

74). Python program to count the frequency in a given dictionary.
Input = { a:10, b:20, c:25, d:10, e:30, f:20 }
Output = { 10:2, 20:2, 25:1, 30:1}

Solution

75). Python program to create key-value list pairings in a given dictionary.
Input = { 1: [‘Virat Kohli’], 2: [‘Rohit Sharma’], 3: [‘Hardik Pandya’] }
Output = [ { 1: ‘Virat Kohli’, 2: ‘Rohit Sharma’, 3: ‘Hardik Pandya’ } ]

Solution

76). Python program to get the total length of a dictionary with string values.
Input = { ‘virat’:50,’Rohit’:40,’Rahul’:25 }
Output :
Total length: 6

Solution

77). Python program to group the elements of a given list based on the given function.
Hint : Function name: len()
Input = [‘abc’, ‘defg’, ‘hijkl’]
Output = { 3:[‘abc’],  4:[‘defg’], 5:[‘hijkl’] }

Solution

78). Python program to retrieve the value of the nested key indicated by the given selector list from a dictionary or list.
Input = {‘p1’:{name:{first:lionel, last:messi}, team:[psg,argentina]}}
Output :
Messi
Argentina

Solution

79). Python program to show a dictionary with a maximum count of pairs.
Input:
A = {name:1,age:2}
B = {name:1,age:2,course:3,institute:4}
Output:
2nd dictionary has maximum keys, 4

Solution

80). Python program to Extract Unique values from dictionary values.
Input = { sqa:[1,2,5,6],tools:[3,8,9],is:[2,5,0],best:[3,6,8] }
Output = [0,1,2,3,5,6,8,9]

Solution

81). Python program to show keys associated with values in dictionary
Input = { ‘xyz’:[20,40], abc:[10,20] }
Output ={20: [‘xyz’], 40: [‘xyz’], 10: [‘abc’], 30: [‘abc’]}

Solution

82). Python program to convert a list of dictionaries into a list of values corresponding to the specified key.
Input = [ { name:’jos’,  age:30 }, { name:’david’, age:25 }, { name:’virat’, age:32 } ]
Output = [30, 25, 32]

Solution

83). Python program to find all keys in the provided dictionary that have the given value.
Input = {‘a’: 19, ‘b’: 20, ‘c’: 21, ‘d’: 20}
value = 20
Output = [‘b’, ‘d’]

Solution

84). Python program to convert given a dictionary to a list of tuples.
Input = {‘a’: 19, ‘b’: 20, ‘c’: 21, ‘d’: 20}
Output =[ (a,19), (b,20), (c,21), (d,20) ]

Solution

85). Python program to create a flat list of all the keys in a flat dictionary.
Input = { ‘sqa’: [1,2,5,6], ‘tools’: [3,8,9], ‘is’: [2,5,0], ‘best’ : [3,6,8] } 
Output = [ sqa, tools, is, best]

Solution

86). Python program to create a flat list of all the values in a flat dictionary. 
Input = { sqa:1, tools:2, is:2, best:4 } 
Output =[ 1,2,3,4 ]

Solution

87). Python program to initialize a dictionary with default values.
Name = [ ”Virat”, ”Rohit” ]
Defaults = { ‘sport’ : ’cricket’, ‘salary’ : 100000 }
Output = { “Virat” : { sport: ’cricket’, salary:100000 }, “Rohit”:{ sport: ’cricket’, salary:10000}}

Solution

88). Python program to delete a list of keys from a dictionary.
Input = { ‘a’: 19, ‘b’: 20, ‘c’: 21, ‘d’: 20, ‘e’: 50 }
Keys to be removed:  [ ‘a’, ‘d’, ‘e’ ]
Output = { ‘b’: 20, ‘c’: 21 }

Solution

89). Python program to rename key of a dictionary
Input = { ‘a’: 19, ‘b’: 20, ‘c’: 21, ‘d’: 20}
Output = { ‘a’: 19, ‘b’: 20, ‘c’: 21, ‘e’: 20}

Solution

90). Python program to Invert a given dictionary with non-unique hashable values.
Input = { ‘alex’:1, ’bob’:2,’ martin’:1, ’robert’:2 }
Output = { 1:[‘alex’,’marin’], 2:[‘bob’,’robert’] }

Solution

91). Python program to Sort Dictionary by values summation
Input = { x:[1,5,6], y:[4,8,2], c:[3,9] }
Output = { c:12, x:12, y:14}

Solution

92). Python program to convert a dictionary into n sized dictionary.
Input = { a:1, b:2, c:3, d:4, e:5, f:6 }
N = 3
Output = [{ a:1, b:2, c:3 }, {d:4, e:5, f:6}]

Solution

93). Python program to Sort dictionaries list by Key’s Value list index
Input = [ { a:[ 6, 7, 8],  b:9, c : 10 }, { a : [4, 6, 9],  b: 16, c : 1 } ]
Key = a,  index=0
Output = [ { a : [4, 6, 9],  b: 16, c : 1}, {a: [ 6, 7, 8],  b:9, c : 10} ]…

94) Python program to reverse each string value in the dictionary and add an underscore before and after the Keys.
Input  = {“a” : “Python”, “b”: “Programming”, “c”: “Learning”}
Output = {“_a_”: “nythonP”, “_b_” : “gnimmargorP”, “_c_”: “gearninL”}

Solution

95). Python program to sum unique elements from dictionary list values.
Input = { ‘a’ : [ 6, 7, 2, 8, 1], ‘b’ : [2, 3, 1, 6, 8, 10], ‘d’ : [1, 8, 2, 6, 9] }
Output :
46

Solution