NumPy : Beginner's Guide - Third Edition

Time for action – printing with the print() function

We can print using the print() function as follows:

1. The old syntax is as follows:

   >>> print 'Hello'
   Hello
   

2. The new Python 3 syntax is as follows:

   >>> print('Hello')
   Hello
   

   The parentheses are now mandatory in Python 3. In this book, I try to use the new syntax as much as possible; however, I use Python 2 to be on the safe side. To enforce the syntax, each Python 2 script with print() calls in this book starts with:

   >>> from __future__ import print_function
   

3. Try to use the old syntax to get the following error message:

   >>> print 'Hello'
     File "<stdin>", line 1
       print 'Hello'
                   ^
   SyntaxError: invalid syntax
   

4. To print a newline, use the following syntax:

   >>> print()
   

5. To print multiple items, separate ...