More than one key isn’t allowed
Keys must be immutable
Keys must be integers
When duplicate keys encountered, the last assignment wins
What is the output of the following code?
dict={"Joey":1, "Rachel":2}dict.update({"Phoebe":2})print(dict)
{'Joey': 1, 'Rachel': 2, 'Phoebe': 2}
{“Joey”:1,”Rachel”:}
{“Joey”:1,”Phoebe”:2}
Error
What will be the output of the following Python code snippet?
test = {1:'A', 2:'B', 3:'C'}del test[1]test[1] = 'D'del test[2]print(len(test))
0
2
Error as the key-value pair of 1:’A’ is already deleted
1
What will be the output of the following Python code?
a={1:"A",2:"B",3:"C"}print(a.items())
Syntax error
dict_items([(‘A’), (‘B’), (‘C’)])
dict_items([(1,2,3)])
dict_items([(1, ‘A’), (2, ‘B’), (3, ‘C’)])
a={1:"A",2:"B",3:"C"}b=a.copy()b[2]="D" print(a)
Error, copy() method doesn’t exist for dictionaries
{1: ‘A’, 2: ‘B’, 3: ‘C’}
{1: ‘A’, 2: ‘D’, 3: ‘C’}
“None” is printed
d1 = {"john":40, "peter":45}d2 = {"john":466, "peter":45}print(d1 > d2)
True
False
None
Sequence value pair
Key value pair
Tuple value pair
Record value pair
a={1:"A",2:"B",3:"C"}for i,j in a.items(): print(i,j,end=" ")
1 A 2 B 3 C
1 2 3
A B C
1:”A” 2:”B” 3:”C”
a = {} a[1] = 1 a['1'] = 2 a[1.0]=4 count = 0 for i in a: count += a[i] print(count) print(a)
An exception is thrown
3
6
a={1:"A",2:"B",3:"C"}for i in a: print(i,end=" ")
‘A’ ‘B’ ‘C’
1 ‘A’ 2 ‘B’ 3 ‘C’
Error, it should be: for i in a.items():
What will be the output?
a={'a':4,'b':6,'a':7}print(a)
{'a': 5, 'b': 6,'a': 7 }
{'a': 7, 'b': 6}
{'a': 5, 'b': 6 }
Key Error
d.delete(“john”:40)
d.delete(“john”)
del d[“john”]
del d(“john”:40)
d = {0: 'a', 1: 'b', 2: 'c'}for x in d.values(): print(x)
0 1 2
a b c
0 a 1 b 2 c
none of the mentioned
dictionary()
set()
tuple()
list()
del
remove
removeAll
None of these
count={} count[(1,2,4)] = 5 count[(4,2,1)] = 7 count[(1,2)] = 6 count[(4,2,1)] = 2 tot = 0 for i in count: tot=tot+count[i] print(len(count)+tot)
25
17
16
Tuples can’t be made keys of a dictionary
What is the output of following code
d = {1:"A", 2:"B", 1:"C"}print(d)
{1:'A',2:'B'}
{1:'C',2:'B'}
{1:'A',1:'C',2:'B'}
Clears all key-value pairs
Updates a specific key
Merges another dictionary into the current one
Removes all values
a={} a[2]=1 a[1]=[2,3,4] print(a[1][1])
[2,3,4]
d1 = {"john":40, "peter":45}d2 = {"john":466, "peter":45}print(d1 == d2)
Since “susan” is not a value in the set, Python raises a KeyError exception
It is executed fine and no exception is raised, and it returns None
Since “susan” is not a key in the set, Python raises a KeyError exception
Since “susan” is not a key in the set, Python raises a syntax error
d1={"abc":5,"def":6,"ghi":7}print(d1[0])
abc
5
{"abc":5}
error
a={1:"A",2:"B",3:"C"}print(a.get(1,4))
A
4
Invalid syntax for get method
d = {"john":40, "peter":45}print(list(d.keys()))
[“john”, “peter”]
[“john”:40, “peter”:45]
(“john”, “peter”)
(“john”:40, “peter”:45)
d = {"a": 1, "b": 2}print(2 in d)
KeyError
{1: ‘A’, 2: ‘B’}
dict([[1,”A”],[2,”B”]])
{1,”A”,2”B”}
{ }
a=dict()print(a[1])
An exception is thrown since the dictionary is empty
‘ ‘
getkeys()
key()
keys()
d = {0: 'a', 1: 'b', 2: 'c'}for x in d.keys(): print(d[x])
d = {"john":40, "peter":45}print(d["john"])
40
45
“john”
“peter”
a = {}a[1] = 1a['1'] = 2a[1]=a[1]+1count = 0for i in a: count += a[i]print(count)
Error, the keys can’t be a mixture of letters and numbers
a={1:"A",2:"B",3:"C"}b={4:"D",5:"E"}a.update(b) print(a)
Method update() doesn’t exist for dictionaries
{1: 'A', 2: 'B', 3: 'C', 4: 'D', 5: 'E'}
{4: ‘D’, 5: ‘E’}
a={1:"A",2:"B",3:"C"}a.setdefault(4,"D") print(a)
{1: ‘A’, 2: ‘B’, 3: ‘C’, 4: ‘D’}
[1,3,6,10]
>>> a={1:"A",2:"B",3:"C"}>>> del a
method del doesn’t exist for the dictionary
del deletes the values in the dictionary
del deletes the entire dictionary
del deletes the keys in the dictionary
d.size()
len(d)
size(d)
d.len()
a={1:5,2:3,3:4}a.pop(3) print(a)
{1: 5}
{1: 5, 2: 3}
Error, syntax error for pop() method
{1: 5, 3: 4}
Returns True if any key of the dictionary is true
Returns False if dictionary is empty
Returns True if all keys of the dictionary are true
Method any() doesn’t exist for dictionary
d = {}d[1] = "Python"d[2] = "Java"print(len(d))
String
Dictionary
List
Tuple
d = {0: 'a', 1: 'b', 2: 'c'}for x in d.values(): print(d[x])
test = {1:'A', 2:'B', 3:'C'}test = {} print(len(test))
The values of a dictionary can be accessed using keys
The keys of a dictionary can be accessed using values
Dictionaries aren’t ordered
Dictionaries are mutable
Removes an arbitrary element
Removes all the key-value pairs
Removes the key-value pair for the key given as an argument
Invalid method for dictionary
Which of the following will delete key-value pair for key="tiger" in dictionary?
dic={"lion":"'wild","tiger":"'wild",'cat":"domestic","dog":"domestic"}
del dic("tiger")
dic["tiger"].delete()
delete(dic.["tiger'])
del dic["tiger"]
dict1={'a':[3,6,8]}print(len(dict1))
More than one key can have the same value
The values of the dictionary can be accessed as dict[key]
Values of a dictionary must be unique
Values of a dictionary can be a mixture of letters and numbers
allkeys()
keyvalues()
a = {1:"A", 2: "B", 3: "C"}b = {4: "D", 5: "E"}a.update(b)print(a)
{1:’A’, 2: ‘B’,3: ‘C’}
{1: ‘A’, 2: ‘b’, 3: ‘c’, 4: ‘D’, 5: ‘E’}
a={}a['a']=1a['b']=[2,3,4] print(a)
Exception is thrown
{‘b’: [2], ‘a’: 1}
{‘b’: [2], ‘a’: [3]}
{'a': 1, 'b': [2, 3, 4]}
a={1:"A",2:"B",3:"C"}print(a.get(3))
Error, invalid syntax
C