Review Week 2 presentation notebooks
ists, tuples,sets, and dictionaries are containers for other data. They can be used to combine your data in more complex ways.
Data structure Properties Syntax
List Ordered, mutable sequence mylist = [1,2,3]
Tuple Ordered, immutable sequence mytuple = (1,2,3)
Set Unordered set of unique values set(1,2,3)
Dictionary Mutable set of key, value pairs mydict = {'first_value':1, 'second_value:2}
Logic operators
We test conditions using logic operators.
Symbol Task Performed
== True, if it is equal
!= True, if not equal to
< less than
<= less than or equal to
> greater than
>= greater than or equal to
# NOTE: We declare variables using '=' a = 5
b = 7
# But compare them using '==' a == b
False
# Test whether a does not equal b a != b
True
# Logic expressions evaluate to True or False (datatype: Bool) test = b > a
print(test)
print(type(test))
True
<class 'bool'>
Testing conditions inside a loop
Combining loops with logic allows you to build more sophisticated code structures:
days = ['Mon','Tue','Wed','Thu','Fri','Sat','Sun']
for day in days:
if day == 'Sat' or day == 'Fri': location = 'TSI'
elif day == 'Sun':
location = 'Home!' else:
location = 'Work + TSI' print(day, location)
Mon Work + TSI Tue Work + TSI Wed Work + TSI Thu Work + TSI Fri TSI
Sat TSI
Sun Home!
authorized_pets = ['small dog', 'cat', 'hamster','budgerigar']
print("Welcome to Nick's Apartment Block.")
my_pet = input("Type your pet's breed to see if it's accepted: ")
if my_pet in authorized_pets:
print(f"Congratulations, your {my_pet} is welcome here!") else:
print(f"Sorry your {my_pet} is NOT ACCEPTED")
Welcome to Nick's Apartment Block.
Type your pet's breed to see if it's accepted: dog Sorry your dog is NOT ACCEPTED
Exercises
Please organise your solutions as a separate notebook and upload to the LMS (Moodle):
Notebook (.ipynb)
Generate pdf (File -> Download as -> PDF).
EXERCISE 1
Review operations on lists (adding/removing elements, slicing, sorting, etc.). Illustrate their usage on a list of your choice.
# YOUR CODE HERE:
my_order_listODD = [4, 5, 6, 7, 8, 9, 11, 13, 15, 16] my_order_listODD.append(17)
my_order_listODD.remove(8)
#Removing all even numbers for ele in my_order_listODD:
if ele % 2 == 0:
my_order_listODD.remove(ele)
my_order_listODD.sort() print(my_order_listODD)
my_listcut_v1 = my_order_listODD[1:-3] print(my_listcut_v1)
my_listcut_v2 = my_order_listODD[::4] print(my_listcut_v2)
[5, 7, 9, 11, 13, 15, 17]
[7, 9, 11]
[5, 13]
EXERCISE 2
Review operations on sets (like intersection or pop) using the table https://wesmckinney.com/book/python-builtin.html#tbl- table_set_operations and illustrate usage of at least 3 of them for a set of your choice.
# YOUR CODE HERE:
my_data_set = {'data1', 'data2', "data3", "data4", "data5", "data6"}
my_data_set.add("data10")
my_data_set.pop() print(my_data_set)
my_value_set2 = {'value3', 'value5', 'value7', 'value9'}
value_data_inter = my_data_set.intersection(my_value_set2) print(value_data_inter)
value_data_uni = my_data_set.union(my_value_set2)
print(value_data_uni)
{'data4', 'data2', 'data5', 'data10', 'data6', 'data3'} set()
{'value5', 'value7', 'value3', 'value9', 'data4', 'data2', 'data5', 'data10', 'data6', 'data3'}
# YOUR CODE HERE:
fruits = ("apple", "orange", "pear") veg = "broccoli"
fruits_and_veg = str(fruits) + veg print(fruits_and_veg)
fruits_and_veg2 = fruits+(veg,) print(fruits_and_veg2)
('apple', 'orange', 'pear')broccoli
('apple', 'orange', 'pear', 'broccoli')
EXERCISE 4
Write a Python program to a string of comma-separated values into a tuple
# YOUR CODE HERE:
fruit_string = "apple, orange, pear"
fruit_tuple = tuple(fruit_string.split(',')) print(fruit_string)
print(fruit_tuple)
apple, orange, pear
('apple', ' orange', ' pear')
EXERCISE 5
Write a Python program to check if all values in a list are different
# YOUR CODE HERE:
even_list = [2, 4, 6, 8, 10, 12, 2, 4, 6]
if (len(set(even_list)) == len(even_list)): print("All elements are unique")
else:
print("All elements are not unique")
All elements are not unique
EXERCISE 6
Write a Python program calculate the product, multiplying all the numbers of a given tuple. Original Tuple: (4, 3, 2, 2, -1, 18) Product: -864
Original Tuple: (2, 4, 8, 8, 3, 2, 9) Product: 27648
Original Tuple: (1, "Two", 3, "Four", 5) Product: 15
# YOUR CODE HERE:
def mutiple_tuple(nums): temp = list(nums)
product = 1
for x in temp:
if not isinstance(x,int): continue product = product * x
return product
nums = (4, 3, 2, 2, -1, 18)
print(mutiple_tuple(nums))
import numpy
original_tuple2 = (2, 4, 8, 8, 3, 2, 9) result1 = numpy.prod(original_tuple2) print(result1)
nums= (1, "Two", 3, "Four", 5) print(mutiple_tuple(nums))
-864
27648
15
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