What are the differences between dict.items() and dict.iteritems()? What are Iteritems () in Python?
Are there any applicable differences between dict.items() and dict.iteritems()?
From the Python docs:
dict.items(): Return a copy of the dictionary’s list of (key, value) pairs.
dict.iteritems(): Return an iterator over the dictionary’s (key, value) pairs.
If I run the code below, each seems to return a reference to the same object. Are there any subtle differences that I am missing?
a={1:'one',2:'two',3:'three'}
print 'a.items():'
for k,v in a.items():
if d[k] is v: print 'tthey are the same object'
else: print 'tthey are different'
print 'a.iteritems():'
for k,v in a.iteritems():
if d[k] is v: print 'tthey are the same object'
else: print 'tthey are different'
Output-
a.items():
they are the same object
they are the same object
they are the same object
a.iteritems():
they are the same object
they are the same object
they are the same object
dict.items() returns a list of tuples and it is time-consuming and memory exhausting whereas, dict.iteritems() is an iter-generator method which yields tuples and it is less time-consuming and less memory exhausting.
In Python 3, some changes were made and now, items() returns iterators and never builds a list fully. Moreover, in this version iteritems() was removed since items() performed the same function like viewitems() in Python 2.7.
What are Iteritems () in Python?
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.
Answer (1)
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