Form 4 - Computer
2024-2025
Floor 4 - Computer Room
Mr. Peter
While Loop & List
Santa Rosa de Lima English Secondary School
聖羅撒英文中學
Colégio de Santa Rosa de Lima - Secção Inglesa
Outline
List
1.
Explore the concept of List
How to process List in While Loop
2.
Focusing on the List processing in looping
Python List implementation
3.
Define while loop statement for List scanning
What is List?
What is List?
0
1
...
[
]
2
1
4
1
1
1
3
1
boxes =
In Python:
boxes = [ 1, 1, 1, 1, 1 ]print( boxes[ 0 ] )Get variable from List
list[ position ]
Output: 1
What is List?
0
a
"
"
2
c
4
e
1
b
3
d
text =
We can also get letter from text
text = "abcde"print( text[ 0 ] )Get letter from text
Output: a
text[ position ]
Python List Exercises
Python List - Ex01
Print All Odd Numbers in a List
1.
Use a while loop to iterate through the numbers.
1
Print the digit if digit is equal to Odd number
2
digits = [1, 2, 6, 3, 4, 5, 1, 2, 3, 4, 1, 2, 3, 4, 2, 6, 3, 4, 6, 4, 3, 5]( The variable "i" increases from 0 to len(digits) )
Save your file as "ClassNumber_YourName_Ex01.py"
Print the result
3
1
3
5
1
3
1
3
3
3
5Expected output:
Python List - Ex02
Write a program to count how many times "2" element appears in a given list using a while loop.
1.
Use a while loop to iterate through the numbers.
1
Increase count variable if digit is equal to "2"
2
digits = "1263451234123426346435"( The variable "i" increases from 0 to len(digits) )
Save your file as "ClassNumber_YourName_Ex02.py"
Print the accumulated result
3
4Expected output:
Python List - Ex03
Write a Python program to find the largest number in a list using a while loop.
2.
Use a while loop to iterate through the numbers.
1
Update the maximum number if the current number is greater than the stored value.
2
numbers = [3, 1, 4, 1, 5, 9, 1, 2, 7, 3, 10, 13, 4, 6, 7, 1, 2, 6, 9, 5, 3]( The variable "i" increases from 0 to len(numbers) )
Save your file as "ClassNumber_YourName_Ex03.py"
Print the accumulated result
3
13