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-Important differences between Python 2.x and Python 3.x with examples
-Division operator
-print function
-Unicode
-xrange
-Error Handling
-_future_ module
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+Important differences between Python 2.x and Python 3.x with examples:-
+
+
+1. Division operator
+
+If we are porting our code or executing the python 3.x code in python 2.x, it can be dangerous if integer division changes go unnoticed (since it doesn’t raise any error). It is preferred to use the floating value (like 7.0/5 or 7/5.0) to get the expected result when porting our code.
+
+print 7 / 5
+print -7 / 5   
+ 
+'''
+Output in Python 2.x:
+1
+-2
+Output in Python 3.x :
+1.4
+-1.4
+'''
+
+
+2. print function
+
+This is the most well known change. In this the print function in Python 2.x is replaced by print() function in Python 3.x, i.e, to print in Python 3.x an extra pair of parenthesis is required.
+
+print 'Hello, World!'      # Python 3.x doesn't support
+print('Hope You like these facts')
+ 
+'''
+Output in Python 2.x :
+Hello, Geeks
+Hope You like these facts
+ 
+Output in Python 3.x :
+File "a.py", line 1
+    print 'Hello, Geeks'
+                       ^
+SyntaxError: invalid syntax
+
+'''
+
+
+3. xrange
+
+xrange() of Python 2.x doesn’t exist in Python 3.x. In Python 2.x, range returns a list i.e. range(3) returns [0, 1, 2] while xrange returns a xrange object i. e., xrange(3) returns iterator object which work similar to Java iterator and generates number when needed.
+If we need to iterate over the same sequence multiple times, we prefer range() as range provides a static list. xrange() reconstructs the sequence every time. xrange() doesn’t support slices and other list methods. The advantage of xrange() is, it saves memory when task is to iterate over a large range.
+
+In Python 3.x, the range function now does what xrange does in Python 2.x, so to keep our code portable, we might want to stick to using range instead. So Python 3.x’s range function is xrange from Python 2.x.
+
+for x in xrange(1, 5):
+    print(x),
+ 
+for x in range(1, 5):
+    print(x),
+ 
+'''
+Output in Python 2.x
+1 2 3 4 1 2 3 4
+ 
+Output in Python 3.x
+NameError: name 'xrange' is not defined
+'''
+
+4. Unicode
+
+In Python 2, implicit str type is ASCII. But in Python 3.x implicit str type is Unicode.
+
+print(type('default string '))
+print(type(b'string with b '))
+ 
+'''
+Output in Python 2.x (Bytes is same as str)
+<type 'str'>
+<type 'str'>
+ 
+Output in Python 3.x (Bytes and str are different)
+<class 'str'>
+<class 'bytes'>
+'''
+Python 2.x also supports Unicode
+
+print(type('default string '))
+print(type(u'string with b '))
+ 
+'''
+Output in Python 2.x (Unicode and str are different)
+<type 'str'>
+<type 'unicode'>
+ 
+Output in Python 3.x (Unicode and str are same)
+<class 'str'>
+<class 'str'>
+'''
+
+For more information visit python wiki:-
+https://wiki.python.org/moin/Python2orPython3
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