Programming for GCSE Topic 6.1: Lists (Arrays) and …
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ondon
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Programming for GCSE
Topic 6.1: Lists (Arrays)
and For Loop
William Marsh
School of Electronic Engineering and Computer Science
Queen Mary University of London
Outline
? Array in Python ¨C the issues
? Lists ¨C behaviour that is like an array
? Looping through a list
? Lists ¨C other behaviour
? For loops
Arrays in Python ¨C The Issue
? Python does not have arrays
? (A slight simplification)
? There are two alternatives
? Lists
? Dictionaries
? Both are more flexible than ¡®ordinary¡¯ arrays
? Lists
? Simpler
? 'Array-like' behaviour
Big Idea
? A variable can have a value that combines many
values. You can:
? Extract one value
? Update part of the variable
? This idea is essential for representing complex
data in programs e.g.
? A song
? An image
? A map
ARRAY BEHAVIOUR
OF
LISTS
................
................
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