printing string containing variables in python

Question

I am a novice python learner, though I know printing text containing strings and variables but I want to ask a basic question regarding this. Here is my code:

x=5                                                                                        
print ("the value of x is ",x)                                      
print "the value of x is",x

The first print command prints ('the value of x is ', 5) while the second one prints, the value of x is 5. But print ('hello') & print 'hello' prints hello (the same), why?

Think about this, if (x + y) + 1 made a tuple out of x + y, that would ruin everything! That's why one-tuples are made like ('hello', ) with that trailing comma — jamylak
– jamylak, Commented Jun 1, 2013 at 8:16

Ignacio Vazquez-Abrams · Accepted Answer · 2013-06-01 08:12:51Z

2

Because ('hello') is just 'hello', not a 1-tuple.

answered Jun 1, 2013 at 8:12

Ignacio Vazquez-Abrams

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Comments

Ashwini Chaudhary · Accepted Answer · 2013-06-01 08:23:22Z

1

Print is a statement in py2x not function. so printing ("the value of x is ",x) actually prints a tuple:

>>> type(('hello'))
<type 'str'>
>>> type(('hello',))  # notice the trailing `,` 
<type 'tuple'>

In py2x just remove the () to get the correct output:

>>> print "the value of x is","foo" 
the value of x is foo

or you can also import py3x's print function:

>>> from __future__ import print_function
>>> print ("the value of x is","foo")
the value of x is foo

edited Jun 1, 2013 at 8:23

answered Jun 1, 2013 at 8:17

Ashwini Chaudhary

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2 Comments

darxtrix Over a year ago

thanks, i understood what you said.Will you please suggest me what to do either continue python 2 or skip over to 3?

Ashwini Chaudhary Over a year ago

@ankushsharma Continue with py2.7 as most of the (external)libraries are still on py2x, and the differences between py2x and py3x can be found here:docs.python.org/3.0/whatsnew/3.0.html

Mark Tolonen · Accepted Answer · 2013-06-01 08:16:04Z

0

Assuming Python 2.x, print is a statement and the comma makes the expression a tuple, which prints with parentheses. Assuming Python 3.x, print is a function so the first prints normally and the second is a syntax error.

edited Jun 1, 2013 at 8:16

answered Jun 1, 2013 at 8:13

Mark Tolonen

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1 Comment

Mark Tolonen Over a year ago

Typo, thinking ahead..fixed.

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