Difference between Python 2.7 and Python 3

 Python 3 vs Python 2 are getting used widely in an organization as per their requirements. Python 2. X is widely used as it is stable for a long time. Python 3. X is also getting into a notice of developers. Developers used to go with python 2 as from python 2 to python 3 transitioning is happening and some of the libraries are not available in Python 3 which is very helpful in python 2.

There is the following difference between [ython 3 and python 2.

1.       Print function — In python 3, a print function has been used means arguments should be enclosed in parenthesis. for example print(“this is python3”) instead in python 2, a print is treated as a statement for example print” this is Python2”.

2.       programming language effectiveness— In python 3, syntax changes are done to make the programming language more effective and easy for the developers compared to Python 2.

3.       New built-in functions— In Python 3, new built-in functions are included, and some are removed and renamed as compared to python2.

4.       Compatibility— Python 3 has been developed in such a way that Python 3 is incompatible with python 2.

5.       GUI applications— Python 3 has been broadly supported for developing a wide range of GUI(Graphic User Interface) applications and many other packages are available in Python 3 as compared to Python 2.

6.       Value of integer— In python 3, the value of integer division would be appropriate by default, for example, if we would like to divide 5/2 it will give a result of 2.5. but in Python 2, we need to provide the data type as a float if the output will come in decimal otherwise only the result will come in an integer. only. for example 5/2 it gives result 2.

7.       Text and data— In python 3, text and data have been used. Unicode(UTF-8) is a default encoding source for python 3 and str represented as a length 1 string. but in Python 2, str is represented as the length 8-bit string.

8.       Exceptions— The exception argument should be enclosed in parenthesis in python 3 but in python 2 the exception argument can be enclosed in notations. In python 3, for handling or catching an exception we need to use a keyword. it is except Error as err(except some exception as a variable) but in python 2, we need to use,’ for the same except Error, err( except some exception, err).

9.       Iterators and lists — Range() function introduced for iterations in Python 3 and Xrang() is used for iterations in python 2.

10.   comparisons— the rules of ordering comparisons have been simplified in python 3 but in python 2 the rules of order is more complex.

11.   syntax changes— In python 3, syntax becomes simple and easily understandable but in python 2, it was quite difficult to python 3.

12.   Unicode— By default storing strings as Unicode (UTF-8) in python 3, but in python 2 for storing as Unicode, need to label with “u”.

13.   Division of integers — as we know before, when two integers are divided, in python 3 it will get a float value if required. but in python2 when two integers are divided, always gives an integer value only.

14.          Leak of variable— the value of variables doesn’t leak in python 3 but the value of the global variable got changed while using that in for-loop.