Starter task:
Write a program to do this:
Enter a number: 345 Enter a number: 3568 Enter a number: 2345 Enter a number: 4524 Enter a number: 362 Enter a number: 675 Enter a number: 2 Enter a number: 5467 Enter a number: 381 Enter a number: 155 The numbers you entered were: 345 3568 2345 4524 362 675 2 5467 381 155
Study the output of my shell session carefully. It should teach you all you need to know about lists.
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AMD64)] on win32Type "copyright", "credits" or "license()" for more information.
>>> myList = []
>>> print(myList)
[]
>>> myList.append("Hello")
>>> print(myList)
['Hello']
>>> myList.append(3)
>>> print(myList)
['Hello', 3]
>>> anotherList = ["Goodbye", 2]
>>> myList.extend(anotherList)
>>> print(myList)
['Hello', 3, 'Goodbye', 2]
>>> print(myList[2])
Goodbye
>>> myList[2]="Farewell"
>>> print(myList)
['Hello', 3, 'Farewell', 2]
>>> myList.insert(3, 99)
>>> print(myList)
['Hello', 3, 'Farewell', 99, 2]
>>> myList.remove(99)
>>> print(myList)
['Hello', 3, 'Farewell', 2]
>>> del myList[2]
>>> print(myList)
['Hello', 3, 2]
>>> print(myList[0:1])
['Hello']
>>> print(myList[0:2])
['Hello', 3]
>>> print(myList[:2])
['Hello', 3]
>>> print(myList[1:])
[3, 2]
>>> numList = [4, 2, 8, 6, 9, 1, 7, 3, 5]
>>> print(numList)
[4, 2, 8, 6, 9, 1, 7, 3, 5]
>>> print(sorted(numList))
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> print(numList)
[4, 2, 8, 6, 9, 1, 7, 3, 5]
>>> numList.sort()
>>> print(numList)
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> for blah in numList
SyntaxError: invalid syntax
>>> for blah in numList:
print("Element is ", blah)
Element is 1
Element is 2
Element is 3
Element is 4
Element is 5
Element is 6
Element is 7
Element is 8
Element is 9
>>> print("Hello"[1:3])
el
>>> print(list("Hello"))
['H', 'e', 'l', 'l', 'o']
>>>
Practice tasks:
- Rewrite the starter program using for loops and a list
- Write a program that asks for six words and prints them in alphabetical order
- Write a program that prints a multiplication table for any number that you want
- Write a program that asks for two words and prints true if they are anagrams and false if they are not
(Believe it or not, this last program can be written in ONE LINE of Python code…)
IB Computer Science 