Introduction to: Computers & Programming: Input and Output ...
Introduction to:
Computers & Programming:
Input and Output (IO)
Adam Meyers
New York University
Intro to: Computers & Programming:
Loops in Python
V22.0002-001
Summary
? What is Input and Ouput?
? What kinds of Input and Output have we covered so far?
C print (to the console)
C input (from the keyboard)
? File handling
C input from files
C output to files
C Text files vs. 'pickled' binary files
? URL handling
Intro to: Computers & Programming:
Loops in Python
V22.0002-001
Input
? Input is any information provided to the program
C Keyboard input
C Mouse input
C File input
C Sensor input (microphone, camera, photo cell, etc.)
? Output is any information (or effect) that a
program produces:
C sounds, lights, pictures, text, motion, etc.
C on a screen, in a file, on a disk or tape, etc.
Intro to: Computers & Programming:
Loops in Python
V22.0002-001
Types of Input Covered in This Class
? So Far
C Input: keyboard input only
C Output: graphical and text output transmitted to the
computer screen
? This Unit expands our repertoire to include:
C File Input C Python can read in the contents of files
C File Output C Python can write text to files
Intro to: Computers & Programming:
Loops in Python
V22.0002-001
Files
? File = Named Data Collection stored on memory device
C Different types of data: text, binary, etc
C Accessible by name or address
C Has start and end point
C Program can read, created, modified, (and do other things to)
files
? Text file can be treated like a (big) string
C Human readable
C ASCII/UTF-8/etc. encoding
C Can be plain text or can contain markup (e.g., html)
? Binary files: not human readable, usually require specific
programs to read
Intro to: Computers & Programming:
Loops in Python
V22.0002-001
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