Lean Python: Learn Just Enough Python to Build Useful Tools by Paul Gerrard

Author:Paul Gerrard [Paul Gerrard]
Language: eng
Format: epub
Publisher: Apress
Published: 2016-11-10T22:00:00+00:00

Getting input from and writing output to disk files.

Displaying Output

You’ve seen the print() function1 quite a few times already. The most common way of getting output from a program is to use the print() statement. Print is a function that takes as its arguments the items to be displayed. Optionally, you can also define a separator that is placed between the displayed items and a line terminator value that can replace a newline. The function call looks like this:

print(arg1,arg2,arg3...,sep=' ',end='\n')

Here are some examples of the print() function in use.

>>> boy="Jack"

>>> girl="Jill"

>>> print("Hello World!")

Hello World!

>>> print(boy,'and',girl,'went up the hill')

Jack and Jill went up the hill

It is common to use the string formatting feature.

>>> print('%d plus %d makes %d' % (3, 7, 10))

3 plus 7 makes 10

You can suppress the trailing newline by setting the end argument to an empty string (or something else).

>>> #

>>> # the end= argument defaults to '\n'

>>> # if you change it, there won't be a newline

>>> #

>>> print('one...','two...','three',end='')

one... two... three>>> # note the >>> prompt

The string separator defaults to a single space but can be changed or suppressed by setting it to an empty string.

>>> #

>>> # the sep= argument defaults to a space ' '

>>> # but you can change it, for example...

>>> #

>>> print('one...','two...','three',sep='***')

one...***two...***three

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