[Tutor] print statement vs print() function, was Re: Increase performance of the script

[Peter Otten]

Asad wrote:

> Hi All,
> 
>           I used your solution , however found a strange issue with deque
>           :
> 
> I am using python 2.6.6:

Consider switching to Python 3; my code as posted already works with that.
 
>>>> import collections
>>>> d = collections.deque('abcdefg')
>>>> print 'Deque:', d
>   File "<stdin>", line 1
>     print 'Deque:', d
>                  ^
> SyntaxError: invalid syntax

This is the effect of a

from __future__ import print_function

import. Once that is used print becomes a function and has to be invoked as 
such. 

If you don't want this remove the "from __future__ print_function" statement 
and remove the parentheses from all print-s (or at least those with multiple 
arguments).

Note that in default Python 2

print("foo", "bar")

works both with and without and parens, but the parens constitute a tuple. 
So

>>> print "foo", "bar"  # print statement with two args
foo bar
>>> print ("foo", "bar")  # print statement with a single tuple arg
('foo', 'bar')
>>> from __future__ import print_function
>>> print "foo", "bar"  # illegal, print() is now a function
  File "<stdin>", line 1
    print "foo", "bar"
              ^
SyntaxError: invalid syntax
>>> print("foo", "bar")  # invoke print() function with two args
foo bar