5. Development of Code

Q

As you begin to develop more complex programs you will experience error messages.  The great thing about Python is that it tends to explain the error you have made in detail.  Your job is to understand what these mean and to put them right.

LEARNING OBJECTIVES

You will learn to:

Interpret common error messages

Understand how to debug a program

Understand and use comment statements

Understand the file/new window

Save a program in scripting mode

TASK 1

Copy and run this code and explain the result.

>>>print hello world

TASK 2

Copy and run this code and explain the result.

>>>print("hello world")

TASK 3

Python produces different types of error.  In your learning blog match the type of error with the description of error.

Type of error

TypeError

RuntimeError

NameError

ZeroDivisionError

KeyBoardInterrupt

 

Description of the error

Dividing a number by zero.

When a program is interrupted from the keyboard by pressing control+c.

When a name is used that is not known about (often a variable name that is misspelt).

When an operation is attempt that is invalid for that type of data.

An error occurs when the program is running. TASK 4

 

•

Experiment with Python to see if you can create each type of error.

Hint: A full list of Python errors can be found here:http://www.tutorialspoint.com/python/standard_exceptions.htm

TASK 5

Copy and run this code and explain the result.

# Programmer Amy Smith 6th September 2013

TASK 6

•

Use file/new window to open a script file in the IDLE.

•

Copy this code into the file.

print("So long and thanks for all the fish")

print("The answer is",6*7)

 

•

Save the file using file/save. Always give the filename an extension of .py. Use a meaningful filename and store in a suitable folder.

•

Run the commands by using run/run module

HOMEWORK

Using the Python IDLE

Write your own summary sheet to describe how to run Python programs, including how to save and open .py files. Include any other commands that you have found useful.  

Using the Python IDLE
How to open a new window
How to save a file
How to open a file
How to run a program
Useful tips
alt p	Displays the last line you entered
Commands in the file are not colour coded	Save as a .py file