Python 3 range Vs Python 2 range

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I recently started learning python 3. In python 2 range() function can be used to assign list elements.

>>> A = []
>>> A = range(0,6)
>>> print A
[0, 1, 2, 3, 4, 5]

where as in python 3 when range() function is used this is happening

>>> A = []
>>> A = range(0,6)
>>> print(A)
range(0, 6)

why is this happening? why did python do this change? Is it a boon or a bane ?

Python 3 uses iterators for a lot of things where python 2 used lists.The docs give a detailed explanation including the change to range.

The advantage is that Python 3 doesn't need to allocate the memory if you're using a large range iterator or mapping. For example

for i in range(1000000000): print(i)

requires a lot less memory in python 3. If you do happen to want Python to expand out the list all at once you can

list_of_range = list(range(10))

Python 3's range is more powerful than Python 2's xrange, Python 2 vs Python 3: range. The first thing I need to address is how range works in Python 2 and Python 3. In Python 2, the range function  Python 3 range() function is equivalent to python 2 xrange() function not range() Explanation. In python 3 most function return Iterable objects not lists as in python 2 in order to save memory.

in python 2, range is a built-in function. below is from the official python docs. it returns a list.

range(stop) range(start, stop[, step]) This is a versatile function to create lists containing arithmetic progressions. It is most often used in for loops.

also you may check xrange only existing in python 2. it returns xrange object, mainly for fast iteration.

xrange(stop) xrange(start, stop[, step]) This function is very similar to range(), but returns an xrange object instead of a list.

by the way, python 3 merges these two into one range data type, working in a similar way of xrange in python 2. check the docs.

Python 2 vs Python 3: Key Differences, Is there a big difference between Python 2 and 3? Python 3's range is more powerful than Python 2's xrange Python 2 vs Python 3: range. The first thing I need to address is how range works in Python 2 Similarities. Before we take a look at differences between xrange and range objects, Dunder Methods. The first difference we’ll look at is

In python3, do

A = range(0,6)
A = list(A)
print(A)

You will get the same result.

Should a beginner learn Python 2 or 3, and what is the difference , , which corrected features which were considered to be mistakes now - for instance print being a statement. The range() function works a little bit differently between Python 2.x and 3.x under the hood, however the concept is the same. We'll get to that a bit later, however. Python's range() Parameters. The range() function has two sets of parameters, as follows: range(stop)

Python 3 range() function is equivalent to python 2 xrange() function not range()

Explanation

In python 3 most function return Iterable objects not lists as in python 2 in order to save memory. Some of those are zip() filter() map() including .keys .values .items() dictionary methods But iterable objects are not efficient if your trying to iterate several times so you can still use list() method to convert them to lists

How to Use Python's xrange and range, Is it better to use range or Xrange in a large loop in Python? The range() function in python 3.x is just a re-implementation of the xrange() of python 2.x. It actually works the same way as the xrange does. If you are using Python 2.x, then only the difference between xrange() and range() is meaningful for you.

range() vs xrange() in Python, does. It creates the values as you need them with a special technique called yielding. Advantages of range function in Python. range function returns a list of integers in Python 2. In case of Python 3, it returns a special “range object” just like a generator. Disadvantages of range function in Python. range function is considerably slower; It also occupies more memory space when handling large sized data objects.

range vs xrange in Python 2 and Python 3, If you want to write code that will run on both Python 2 and Python 3, you should use range(). range() – This returns a range object (a type of iterable). xrange() –  The range() function works differently between Python 3 and Python 2. If your application runs on both Python 2 and Python 3, then you must use range() for better code compatibility. In Python 2, we have a range() and xrange() functions to produce a list of numbers within a given range.

The key differences between Python 2.7.x and Python 3.x with , In this video, I have discussed the basic difference between range and xrange objects in Duration: 5:52 Posted: May 25, 2017 In Python 3, there is no xrange , but the range function behaves like xrange in Python 2.If you want to write code that will run on both Python 2 and Python 3, you should use range(). range() – This returns a range object (a type of iterable).

Comments
  • In Python-3.x, range(..) no longer produces a list, it produces a range object, that allows iteration, but also fast len(..), in checks, etc.
  • See this question and its answers.
  • The question asks a lot more than how to get the python2 behavior
  • This helps a lot as well! Thanks for sharing.