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
Write a Python program that calculates the product of digits.
1.
Use a while loop to iterate through the numbers.
1
Print the accumulated result
2
digits = "1263451234123426346435"Product of all digits: 21499084800Expected output:
( The variable "i" increases from 0 to len(digits) )
Save your file as "ClassNumber_YourName_Ex01.py"
Python List - Ex02
Write a Python program that uses a while loop to generate numbers from 1 to 50, increasing by 3 in each step. The program should then merge all the numbers into a single string and print the result.
2.
Use a while loop to iterate through the numbers.
1
Convert each number from the loop to be String with str() function and Accumulate them to be one string
2
Output: "1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49"( The variable "i" increases from 1 to 50, each step increases 3 )
Save your file as "ClassNumber_YourName_Ex02.py"
Python List - Ex03
Write a Python program that reverses the string "ILovePython" using a while loop and prints the result.
3.
Use a while loop to iterate through each charater.
1
Accumulate them to be one string
2
Input: "ILovePython"
Output: "nohtyPevoLI"