Sections 1-2
- Variables
- Python
- Variables and Assigment in JavaScript
- Data Abstraction in Python
- Data Abstraction in JavaScript
- Challenge and Homework
Variables
- Represent a value with a variable: strings, lists, booleans, numbers
- Deetermine the value of a variable as a result of an assignment
Python
Defining Variables
- Variable name "one word"
- Variabels can be numbers, string, lists, or boolean
- Use equal (=) sign to define
- Strings have quotations "" around it
- Functions and conditiosn with variables, including print()
Nathematical Expressions
- Mathmatical expresions can be preformed on the variable that is numerical value
Functions on Lists
- Functions can be preformed on lists, such as append()
Dictionaries
- Defined using curly brackets and equal sign
- Keys and values
Interchanging Variables
- INterchange vriables using temporary variable
Floats
- Define variabvles using float dta types isntead of just integer
Even Function
- Define function with def and colon
- Parenthesis () after function name
Variables and Assigment in JavaScript
Number
- Define variable, e.g. x=1
Boolean
- True and False
Strings
- Words
List
- sequence of several variables, grouped together under a single name
Data Abstraction in Python
Data Abstraction
- Provides a separation between the batraqct properties of a data type and the concrete details of its represenation
- Manage complexiity in programs by giving a collectioin of data a name withut referencing specific elements of the representation
- Makes it easier to implement, develop, and maintain code
- Us eof listws allows for mutipel related values to be treated as a single vaaaue
- On AP exams index values for lists start from 1, not 0 like in Python
Python
Using simple lists and wokring with vairables
- Lists can organize, maintain and develop related data
- e.g. A shopping cart with multiple items, instead of having each item in the cart be its own variable, all the data can be under one variable. If the shopping cart changed, you can edit the list instead of deleting the entire variable
Breaking lists into more lists
- List of data can be split even more
- e.g. Separate a list of dta into 2 new lists
- Organize dta recieved from APi's an othe rresources
Organising different items in the lists
- Indidivudal elements can be called, sparated,and organised using for loops
Splitting and joining lists and data inside them
- split() - splits a string itmo a list, where you can speciy the separtator, default separator is any whitespace
- join() - takes all items in iterable and joins them into one string, which must be specified as the separator
Data Abstraction in JavaScript
- Delare a function, inout and store data, and dsiplay it
Challenge and Homework
data = [104, 101, 4, 105, 308, 103, 5, 107,
100, 306, 106, 102, 108] # list of the different numerical values
min_valid = 100 # minimum value
max_valid = 200 # maximum value
for i in data:
if i >= min_valid and i<= max_valid:
print(str(i) + " is within the range. It's index value is " + str(data.index(i)) + ".")
else:
print(str(i) + " is within the range. It's index value is " + str(data.index(i)) + ".")
albums = [
("Welcome to my Nightmare", "Alice Cooper", 1975, # First album list
[
(1, "Welcome to my Nightmare"),
(2, "Devil's Food"),
(3, "The Black Widow"),
(4, "Some Folks"),
(5, "Only Women Bleed"),
]
),
("Bad Company", "Bad Company", 1974, # Second album list
[
(1, "Can't Get Enough"),
(2, "Rock Steady"),
(3, "Ready for Love"),
(4, "Don't Let Me Down"),
(5, "Bad Company"),
(6, "The Way I Choose"),
(7, "Movin' On"),
(8, "Seagull"),
]
),
("Nightflight", "Budgie", 1981,
[
(1, "I Turned to Stone"),
(2, "Keeping a Rendezvous"),
(3, "Reaper of the Glory"),
(4, "She Used Me Up"),
]
),
("More Mayhem", "Imelda May", 2011,
[
(1, "Pulling the Rug"),
(2, "Psycho"),
(3, "Mayhem"),
(4, "Kentish Town Waltz"),
]
),
]
album_num = int(input("Choose an album 1-4:"))
if album_num == 2:
song_num = int(input("Choose a song 1-8:"))
else:
song_num = int(input("Choose a song 1-4:"))
print("Playing " + str(albums[album_num-1][3][song_num-1][1]) + " from Album " + str(albums[album_num-1][0]) + " by Artist " + str(albums[album_num-1][1]) + " in " + str(albums[album_num-1][2]))