Unit 3 Sections 14 and 15
Libraries and Random Values
- wget https://raw.githubusercontent.com/aidenhuynh/CS_Swag/master/_notebooks/2022-11-30-randomvalues.ipynb
- Libraries
https://raw.githubusercontent.com/aidenhuynh/CS_Swag/master/_notebooks/2022-11-30-randomvalues.ipynb
wgetLibraries
- A library is a collection of precompiled codes that can be used later on in a program for some specific well-defined operations.
- These precompiled codes can be referred to as modules. Each module contains bundles of code that can be used repeatedly in different programs.
- A library may also contain documentation, configuration data, message templates, classes, and values, etc.
Why are libraries important?
- Using Libraries makes Python Programming simpler and convenient for the programmer.
- One example would be through looping and iteration, as we don’t need to write the same code again and again for different programs.
- Python libraries play a very vital role in fields of Machine Learning, Data Science, Data Visualization, etc.
A few libraries that simplify coding processes:
- Pillow allows you to work with images.
- Tensor Flow helps with data automation and monitors performance.
- Matplotlib allows you to make 2D graphs and plots.
The AP Exam Refrence Sheet itself is a library!
Hacks:
Research two other Python Libraries NOT DISCUSSED DURING LESSON and make a markdown post, explaining their function and how it helps programmers code.
API’s
- An Application Program Interface, or API, contains specific direction for how the procedures in a library behave and can be used.
- An API acts as a gateway for the imported procedures from a library to interact with the rest of your code.
Activity: Walkthrough with NumPy
- Install NumPy on VSCode:
- Open New Terminal In VSCode:
- pip3 install --upgrade pip
- pip install numpy
REMEMBER: When running library code cells use Python Interpreter Conda (Version 3.9.12)
Example of using NumPy for arrays:
import numpy as np
new_matrix = np.array([[1, 2, 3],[4, 5, 6],[7, 8, 9]])
print (new_matrix)
import numpy as np
# defining polynomial function
var = np.poly1d([2, 0, 1])
print("Polynomial function, f(x):\n", var)
# calculating the derivative
derivative = var.deriv()
print("Derivative, f(x)'=", derivative)
# calculates the derivative of after
# given value of x
print("When x=5 f(x)'=", derivative(5))
Random Values
- Random number generation (RNG) produces a random number (crazy right?)
- This means that a procedure with RNG can return different values even if the parameters (inputs) do not change
- CollegeBoard uses
RANDOM(A, B)
, to return an integer between integersA
andB
.- RANDOM(1, 10) can output 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10
- In Python, this would be
random.randint(A, B)
, after importing Python's "random" library (import random
) - JavaScript's works a little differently, with
Math.random()
returning a value between 0 and 1.- To match Python and CollegeBoard, you could make a procedure like this
CollegeBoard Example: What is the possible range of values for answ3
import random # Fill in the blank
def Dice(n):
sum = 0
while n != 0:
sum = sum + random.randint(1, 6)
n = n - 1
return sum
Dice(5) # Will output a range of 5 to 30
Homework
-
Write a procedure that generates n random numbers, then sorts those numbers into lists of even and odd numbers (JS or Python, Python will be easier).
-
Using NumPy and only coding in python cell, find the answer to the following questions: a. What is the derivative of 2x^5 - 6x^2 + 24x? b. What is the derivative of (13x^4 + 4x^2) / 2 when x = 9?
-
Suppose you have a group of 10 dogs and 10 cats, and you want to create a random order for them. Show how random number generation could be used to create this random order.
import random
def generate_random_numbers(n):
numbers = []
even_numbers = []
odd_numbers = []
for i in range(n):
numbers.append(random.randint(1, 100))
for number in numbers:
if number % 2 == 0:
even_numbers.append(number)
else:
odd_numbers.append(number)
return even_numbers, odd_numbers
# Calling the procedure to generate 10 random numbers and printing the result
even_numbers, odd_numbers = generate_random_numbers(10)
print("Even numbers:", even_numbers)
print("Odd numbers:", odd_numbers)
import numpy as np
def find_derivative(x):
f1 = 2 * x**5 - 6 * x**2 + 24 * x
f2 = (13 * x**4 + 4 * x**2) / 2
# Use NumPy's gradient() function to calculate the derivative of each function
df1 = np.gradient(f1)
df2 = np.gradient(f2)
return df1, df2
df1, df2 = find_derivative(9)
# Print the results
print("The derivative of f1(x) at x = 9 is", df1)
print("The derivative of f2(x) at x = 9 is", df2)
import random
dogs = ["dog1", "dog2", "dog3", "dog4", "dog5", "dog6", "dog7", "dog8", "dog9", "dog10"]
cats = ["cat1", "cat2", "cat3", "cat4", "cat5", "cat6", "cat7", "cat8", "cat9", "cat10"]
animals = dogs + cats
# Shuffle the order of the animals
random.shuffle(animals)
# Print the shuffled list of animals
print(animals)