Bernard Szlachta at 19:20, 6 February 2013

2013-02-06T19:20:05Z

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{{Cat|Python Commands|0010}}
{{Python Links}}

== Reading from the text console ==
User input can be read from the keyboard with or without a message text. The value returned is always a string:

<source lang="python">
a = raw_input()
a = raw_input('Please enter a number')
</source>

== Writing to the text console ==
The Python print statement is very versatile and accepts almost any combination of strings, numbers, function calls, and arithmetic operations separated by commas.

<source lang="python">
print 'Hello World'
print 3 + 4
print 3.4
print ”””Text that stretches over
multiple lines.”””
print 'number', 77
print
print int(a) * 7
</source>

== String formatting ==
Variables and strings can be combined, using formatting characters. This works also within a print statement. In both cases, the number of values and formatting characters must be equal.

<source lang="python">
s = 'Result: %i'%(number)
print 'Hello %s!'%('Roger')
print '(%6.3f/%6.3f)'%(a,b)
</source>

The formatting characters include:

* %i – an integer.
* %4i – an integer formatted to length 4.
* %6.2f – a float number with length 6 and 2 after the comma.
* %10s – a right-oriented string with length 10.

== Escape characters ==

Strings may contain also the symbols: \t (tabulator), \n (newline), \r (carriage return), and \\ (backslash).

Basic input and output - Revision history

Bernard Szlachta at 19:20, 6 February 2013