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Difference between dict.items() and dict.iteritems() in Python

  • Difficulty Level : Easy
  • Last Updated : 12 Dec, 2019

dict.items() and dict.iteriteams() almots does the same thing, but there is a slight difference between them –

  • dict.items(): returns a copy of the dictionary’s list in the form of (key, value) tuple pairs, which is a (Python v3.x) version, and exists in (Python v2.x) version.
  • dict.iteritems(): returns an iterator of the dictionary’s list in the form of (key, value) tuple pairs. which is a (Python v2.x) version and got omitted in (Python v3.x) version.

For Python2.x:

Example-1




# Python2 code to demonstrate
# d.iteritems()
  
  
d ={
  "fantasy": "harrypotter",
  "romance": "me before you",
  "fiction": "divergent"
  }
  
# every time you run the object address keeps changes
print d.iteritems()

Output:

<dictionary-itemiterator object at 0x7f04628d5890>

To print the dictionary items, use a for() loop to divide the objects and print them
Example-2




# Python2 code to demonstrate
# d.iteritems()
  
d ={
"fantasy": "harrypotter",
"romance": "me before you",
"fiction": "divergent"
}
  
for i in d.iteritems():
      
    # prints the items
    print(i)

Output:

('romance', 'me before you')
('fantasy', 'harrypotter')
('fiction', 'divergent')

If we try to run the dict.items() in Python v2.x, it runs as dict.items() exists in v2.x.

Example-3




# Python2 code to demonstrate
# d.items()
  
  
d ={
  "fantasy": "harrypotter",
  "romance": "me before you",
  "fiction": "divergent"
  }
    
# places the tuples in a list.
print(d.items())
  
# returns iterators and never builds a list fully.
print(d.iteritems())

Output:

[(‘romance’, ‘me before you’), (‘fantasy’, ‘harrypotter’), (‘fiction’, ‘divergent’)]
<dictionary-itemiterator object at 0x7f1d78214890>

For Python3:

Example-1




# Python3 code to demonstrate
# d.items()
  
d ={
  "fantasy": "harrypotter",
  "romance": "me before you",
  "fiction": "divergent"
  }
  
# saves as a copy
print(d.items())
  

Output:

dict_items([(‘fantasy’, ‘harrypotter’), (‘fiction’, ‘divergent’), (‘romance’, ‘me before you’)])

If we try to run the dict.iteritems() in Python v3.x, we will ecounter with an error.

Example-2




# Python3 code to demonstrate
# d.iteritems()
  
  
d ={
  "fantasy": "harrypotter",
  "romance": "me before you",
  "fiction": "divergent"
  }
  
print("d.items() in (v3.6.2) = ")
for i in d.items():
  
    # prints the items
    print(i)
  
print("\nd.iteritems() in (v3.6.2)=")
  
for i in d.iteritems():
  
    # prints the items
    print(i)

Output:

d.items() in (v3.6.2) = 
('fiction', 'divergent')
('fantasy', 'harrypotter')
('romance', 'me before you')

d.iteritems() in (v3.6.2)=
Traceback (most recent call last):
  File "/home/33cecec06331126ebf113f154753a9a0.py", line 19, in 
    for i in d.iteritems():
AttributeError: 'dict' object has no attribute 'iteritems'


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