Student Lesson Python Libraries • 55 min read

Oct 26, 2023

Description

To teach the class how to use public Python libraries around the internet

• What is a Library?
• Required Installations
• Images using requests and pillow libraries
• Hack 1
• Math Operations With Python Libraries
• Example Sine Graph
• Hack 2

What is a Library?

Essentially a list of pre-written code that you can use to streamline and clean up your program.

Libraries can help simplify complex programs

APIS are specifications for how the procedures in a library behave, and how they can be used

Documentations for an API/library is necessary in understanding the behaviors provided by the API/library and how to use them

Libraries that we will go over: Requests, Pillow, Pandas, Numpy, Scikit-Learn, TensorFlow, matplotlib.

Required Installations

Please run the following commands in your vscode terminal in order to continue the lesson

• pip install numpy
• pip install matplotlib
• pip install scikit-learn
• pip install pillow
• pip install pandas
• pip install tensorflow
• pip install requests

import sys
!{sys.executable} -m pip install pandas
!{sys.executable} -m pip install matplotlib

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[notice] A new release of pip is available: 23.2.1 -> 23.3.1
[notice] To update, run: C:\Users\will\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\python.exe -m pip install --upgrade pip


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[notice] A new release of pip is available: 23.2.1 -> 23.3.1
[notice] To update, run: C:\Users\will\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\python.exe -m pip install --upgrade pip

Images using requests and pillow libraries

‘Requests’ is focused on handling HTTP requests and web data while ‘Pillow’ is designed for data manipulation and analysis It’s common to see them used together in data-related assignments where data is fetched by HTTP requests using Requests and then processed and analyzed with Pandas.

Here’s an example:

import requests
from PIL import Image
from io import BytesIO

# Step 1: Download an image using Requests
image_url = "https://example.com/path/to/your/image.jpg"  # Replace with the actual URL of the image you want to download
response = requests.get(image_url)

if response.status_code == 200:
    # Step 2: Process the downloaded image using Pillow
    image_data = BytesIO(response.content)  # Create an in-memory binary stream from the response content
    img = Image.open(image_data)  # Open the image using Pillow

    # Perform image processing tasks here, like resizing or applying filters
    img = img.resize((x, y))  # Resize the image and replace x,y with desired amounts

    # Step 3: Save the processed image using Pillow
    img.save("processed_image.jpg")  # Save the processed image to a file

    print("Image downloaded, processed, and saved.")
else:
    print(f"Failed to download image. Status code: {response.status_code}")

In this code, we use the Requests library to download an image from a URL and then if the download is successful the HTTP status code 200 will pop up, and from there we create an in-memory binary stream (BytesIO) from the response content. We then use the Pillow library to open the image, make any necessary changes, and save the processed image to a file.

Here’s a step by step tutorial on how we wrote this code: 1)We started by importing the necessary libraries, which were Requests, Pillow, and io.

2)Download the Image

3)Use the Requests library to send an HTTP GET request to the URL to download the image. Check the response status code to make sure the download goes through(status code 200).

4)If the download is successful, create an in-memory binary stream (BytesIO) from the response content. Process the Image:

5)Utilize the Pillow library to open the image from the binary stream. Change photo to desired preference(ie: size) Save the Processed Image:

6)Save the processed image to a file using Pillow. Choose a filename and file format for the saved image.

Hack 1

Write a Python code that accomplishes the following tasks:

Downloads an image from a specified URL using the Requests library. Processes the downloaded image (like resizing) using the Pillow library. Save the processed image to a file.

import requests
from PIL import Image
from io import BytesIO

# Step 1: Download a random image using Requests
image_url = "https://source.unsplash.com/random"  # Use a source that provides random images
response = requests.get(image_url)

if response.status_code == 200:
    # Step 2: Process the downloaded image using Pillow
    image_data = BytesIO(response.content)  # Create an in-memory binary stream from the response content
    img = Image.open(image_data)  # Open the image using Pillow

    # Perform image processing tasks here, like resizing or applying filters
    img = img.resize((200, 400))  # Resize the image and replace with desired dimensions

    img.save("processed_image.jpg")  # Save the processed image to a file

    print("Random image downloaded, processed, and saved.")
else:
    print(f"Failed to download image. Status code: {response.status_code}")

Random image downloaded, processed, and saved.

Math Operations With Python Libraries

Numpy(Numerical Python) is used for numerical and scientific computing. It provides tools for handling large sets of numbers, such as data tables and arrays. Numpy makes it easier and more efficient to do mathematical tasks.

The Matplotlib library lets you create a visual representation of your data (graphs, charts, and etc.)

Example Sine Graph

Uses numpy and matplotlib libaries

import numpy as np
import matplotlib.pyplot as plt

# Generate sample data with NumPy
x = np.linspace(0, 2 * np.pi, 100) 
# Create an array of values from 0 to 2*pi
# 100 is included to have 100 points distributed between 0 and 2π to make graph smoother
y = np.sin(x)
# Compute the sine of each value

# Create a simple line plot using Matplotlib
plt.plot(x, y, label='Sine Function', color='blue', linestyle='-')  # Create the plot
plt.title('Sine Function')  # Set the title
plt.xlabel('x')  # Label for the x-axis
plt.ylabel('sin(x)')  # Label for the y-axis
plt.grid(True)  # Display a grid
plt.legend()  # Show the legend
plt.show()  # Display the plot

Hack 2

Using the data from the numpy library, create a visual graph using different matplotlib functions.

import numpy as np
import matplotlib.pyplot as plt

# Generate data for the line
x = np.linspace(0, 10, 50)  # Create an array of values from 0 to 10
y1 = 2 * x + 1  # Set of data points for the line

# Create and display a plot using Matplotlib
plt.plot(x, y1, label='Linear Graph', color='red', linestyle='-')  # Create the plot
plt.title('Line')  # Set the title
plt.xlabel('x')  # Label for the x-axis
plt.ylabel('2x + 1')  # Label for the y-axis
plt.grid(True)  # Display a grid
plt.legend()  # Show the legend
plt.show()  # Display the plot

Tensor Flow is used in deep learning and neural networks, while scikit-learn is used for typical machine learning tasks. When used together, they can tackle machine learning projects. In the code below, Tensor Flow is used for model creation and training. Scikit-learn is used for data-processing and model evaluation.

Pip install tensorflow scikit-learn

import numpy as np
import tensorflow as tf
from sklearn.model_selection import train_test_split
from sklearn.metrics import mean_squared_error
from sklearn.preprocessing import StandardScaler
from tensorflow import keras
from tensorflow.keras import layers
# Generate synthetic data
np.random.seed(0)
X = np.random.rand(100, 1)  # Feature
y = 2 * X + 1 + 0.1 * np.random.randn(100, 1)  # Target variable with noise
# Split the data into training and testing sets
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
# Standardize the features
scaler = StandardScaler()
X_train = scaler.fit_transform(X_train)
X_test = scaler.transform(X_test)
# Create a simple linear regression model using TensorFlow and Keras
model = keras.Sequential([
    layers.Input(shape=(1,)),
    layers.Dense(1)
])
# Compile the model
model.compile(optimizer='adam', loss='mean_squared_error')
# Train the model
model.fit(X_train, y_train, epochs=100, batch_size=32, verbose=2)
# Make predictions on the test set
y_pred = model.predict(X_test)
# Calculate the Mean Squared Error on the test set
mse = mean_squared_error(y_test, y_pred)
print(f"Mean Squared Error: {mse:.4f}")

Epoch 1/100


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Epoch 8/100
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Epoch 9/100
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Epoch 10/100
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Epoch 11/100
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Epoch 42/100
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Epoch 51/100
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Epoch 54/100
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Epoch 55/100
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Epoch 58/100
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Epoch 59/100
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Epoch 80/100
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Epoch 81/100
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Epoch 82/100
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Epoch 85/100
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Epoch 86/100
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Epoch 87/100
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Epoch 88/100
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Epoch 89/100
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Epoch 90/100
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Epoch 91/100
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Epoch 92/100
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Epoch 93/100
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Epoch 94/100
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Epoch 95/100
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Epoch 96/100
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Epoch 97/100
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Epoch 98/100
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Epoch 99/100
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Epoch 100/100
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1/1 [==============================] - 0s 24ms/step
Mean Squared Error: 3.7303

A decrease in loss and time metrics (ms/epoch and ms/step) shows the efficiency increases as the training epochs increases

Hack

fill in the missing code to match the custom data set

import numpy as np
import tensorflow as tf
from sklearn.model_selection import train_test_split
from sklearn.metrics import mean_squared_error
from sklearn.preprocessing import StandardScaler
from tensorflow import keras
from tensorflow.keras import layers

# Generate a custom dataset
np.random.seed(0)
num_samples = 100
bedrooms = np.random.randint(1, 5, num_samples)
square_footage = np.random.randint(1000, 2500, num_samples)
house_prices = 100000 + 50000 * bedrooms + 100 * square_footage + 10000 * np.random.randn(num_samples)
X = np.column_stack((bedrooms, square_footage))
y = house_prices.reshape(-1, 1)

# Split the data into training and testing sets
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)

# Standardize the features
scaler = StandardScaler()
X_train = scaler.fit_transform(X_train)
X_test = scaler.transform(X_test)

# Create a regression model using TensorFlow and Keras
model = keras.Sequential([
    layers.Input(shape=(2,)),  # Input shape adjusted to the number of features
    layers.Dense(64, activation='relu'),
    layers.Dense(1)  # Output layer for regression
])

# Compile the model for regression
model.compile(optimizer='adam', loss='mean_squared_error')

# Train the model
model.fit(X_train, y_train, epochs=100, batch_size=32, verbose=0)

# Make predictions on the test set
y_pred = model.predict(X_test)

# Calculate the Mean Squared Error on the test set
mse = mean_squared_error(y_test, y_pred)
print(f"Mean Squared Error on the test set: {mse:.2f}")

1/1 [==============================] - 0s 43ms/step
Mean Squared Error on the test set: 158474157368.09

HOMEWORK 1

Create a GPA calculator using Pandas and Matplot libraries and make: 1) A dataframe 2) A specified dictionary 3) and a print function that outputs the final GPA

Extra points can be earned with creativity.

# Import the Pandas library
import pandas as pd

# Import the Matplotlib library 
import matplotlib.pyplot as plt

# Create a dictionary 'data' containing course information
data = {
    'Course': ['Calc', 'CSP', 'World', 'Chem', 'Photography'],
    'Credits': [2, 4, 3, 2, 4],
    'Grade': ['F', 'A', 'F', 'F', 'F'],
}

# Create a Pandas DataFrame 'df' from the 'data' dictionary
df = pd.DataFrame(data)

# Create a dictionary 'grade_points' to map letter grades to grade points
grade_points = {
    'A': 4.0,
    'B': 3.0,
    'C': 2.0,
    'D': 1.0,
    'F': 0.0,
}

# Add a new column 'Grade Points' to the DataFrame 'df' based on the 'Grade' column
df['Grade Points'] = df['Grade'].map(grade_points)

# Calculate the total grade points by multiplying 'Grade Points' and 'Credits' columns and summing them
total_grade_points = (df['Grade Points'] * df['Credits']).sum()

# Calculate the total credits by summing the 'Credits' column
total_credits = df['Credits'].sum()

# Calculate the GPA by dividing the total grade points by the total credits
gpa = total_grade_points / total_credits

# Create a bar chart to visualize the 'Grade Points' for each course
plt.bar(df['Course'], df['Grade Points'])
plt.xlabel('Course')
plt.ylabel('Grade Points')
plt.title('Course Grade Points')

# Display the bar chart
plt.show()

def print_final_gpa(gpa):
    print(f'Your GPA is {gpa:.2f} this trimester')

print_final_gpa(gpa) # print

Your GPA is 1.07 this trimester

HOMEWORK 2

Import and use the “random” library to generate 50 different points from the range 0-100, then display the randomized data using a scatter plot.

Extra points can be earned with creativity.

import random
import matplotlib.pyplot as plt

# Generate 50 random data points in the range of 0-100 for x and y coordinates
xCoords = [random.randint(0, 100) for _ in range(50)]
yCoords = [random.randint(0, 100) for _ in range(50)]

# Create a scatter plot
plt.scatter(xCoords, yCoords, c='b', marker='o')

# Add labels and a title to the plot
plt.xlabel('X-axis')
plt.ylabel('Y-axis')
plt.title('Random Data Scatter Plot')


# Display the plot
plt.legend()
plt.grid(True)
plt.show()

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