#IZIP PYTHON SYNTAX WITH A LIST AS INPUT GENERATOR#

In Python 2, next() as a method of generator object, is allowed. In Python 3, arguments to exception should be declared with 'as' keyword. Raise IOError('file error') #this is the recommended syntax in Python 3 Raise IOError, 'file error' #syntax error is raised in Python 3 Raise IOError('file error') #This is also accepted in Python 2 Raise IOError, 'file error' #This is accepted in Python 2 Python 2 accepts both notations, the 'old' and the 'new' syntax Python 3 raises a Synta圎rror if we do not enclose the exception argument in parenthesis. In addition, the range() object supports slicing in Python 3.2 and later. In Python 3, the range() function is removed, and xrange() has been renamed as range(). In Python 2 range() returns a list, and xrange() returns an object that will only generate the items in the range when needed, saving memory. We have Unicode (utf-8) strings, and 2 byte classes: byte and byte arrays. Python 3 stores strings as Unicode, by default. Python 2 requires you to mark a string with a u if you want to store it as Unicode. Python 3 evaluates 3 / 2 as 1.5 by default, which is more intuitive for new programmers. In order to obtain a floating-point division, numerator or denominator must be explicitly used as float. In Python 2, the result of division of two integers is rounded to the nearest integer. NameError: name 'raw_input' is not defined > x = raw_input('something:') # will result NameError Something:'10' #entered data treated as string with or without '' Something:'10' #entered data treated as string including '' Something:10 #entered data is treated as string even without '' Something:'10' #entered data is treated as string Something:10 #entered data is treated as number Further, the received data is always treated as string. In Python 3, raw_input() function is deprecated. The input() function treats the received data as string if it is included in quotes '' or '', otherwise the data is treated as number. Python 2 has two versions of input functions, input() and raw_input(). Print(x, end=' ') # Appends a space instead of a newline in Python 3 Print x, # Trailing comma suppresses newline in Python 2 In Python 3, 'end =' '' appends space instead of newline. In Python 2, it can be suppressed by putting ',' at the end. The print() function inserts a new line at the end, by default. Print ('Hello World') # in Python 3, print must be followed by ()

Print 'Hello World' #is acceptable in Python 2 Use of parenthesis () with print function is now mandatory.

Most notable and most widely known change in Python 3 is how the print function is used. It is recommended to use _future_ imports, if you are planning Python 3.x support for your code.įor example, if we want Python 3.x's integer division behavior in Python 2, add the following import statement. Imported via the in-built _future_ module in Python 2. Python 3.x introduced some Python 2-incompatible keywords and features that can be What is New in Python 3? The _future_ module

Izip python syntax with a list as input