Free python third party libraries examples

Free python third party libraries examples

I'll respond in English this time! Here are some free Python third-party libraries with examples:

Example:

import numpy as np
Create an array
arr = np.array([1, 2, 3, 4, 5])
Calculate the mean of the array
mean = np.mean(arr)
print(mean)  # Output: 3.0

Example:

import pandas as pd
Create a dictionary
data = {'Name': ['John', 'Anna', 'Peter'],
'Age': [28, 24, 35],
'Country': ['USA', 'UK', 'Australia']}
Convert the dictionary to a DataFrame
df = pd.DataFrame(data)
print(df)  # Output: a DataFrame with three columns and three rows

Example:

from scipy import optimize
Define the objective function to minimize
def func(x):
return x**2 + 10*np.sin(x)
Define the initial guess
x0 = 1.5
Minimize the function using SciPy's minimize function
res = optimize.minimize(func, x0)
print(res)  # Output: an OptimizationResult object with the minimum value

Example:

import cv2
Load a color image
img = cv2.imread('image.jpg')
Convert the image to grayscale
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
Apply thresholding to segment out objects
_, thresh = cv2.threshold(gray, 127, 255, cv2.THRESH_BINARY)
print(thresh)  # Output: a binary image with segmented objects

Example:

import requests
Send a GET request to the URL
response = requests.get('https://www.example.com')
Check if the response was successful (200 OK)
if response.status_code == 200:
print(response.text)  # Output: the HTML content of the webpage

Example:

import matplotlib.pyplot as plt
Create a bar chart
plt.bar(range(5), [1, 2, 3, 4, 5])
Display the plot
plt.show()

Example:

import seaborn as sns
Load the tips dataset from Seaborn
tips = sns.load_dataset('tips')
Create a scatter plot of total bill vs tip percentage
sns.scatterplot(x='total_bill', y='tip', data=tips)
Display the plot
plt.show()

Example:

from bs4 import BeautifulSoup
Load an HTML document from a file
soup = BeautifulSoup('file.html', 'html.parser')
Find all the 
 tags in the document
paragraphs = soup.find_all('p')
print(paragraphs)  # Output: a list of paragraph tags

These are just a few examples of the many free Python third-party libraries available. Each library has its own strengths and weaknesses, so it's essential to choose the right one for your specific use case.

libraries in python example

Here are some examples of how to use Python libraries:

Example 1: Using the math Library

The math library is a built-in library in Python that provides mathematical functions. Here's an example:

import math
print(math.pi)  # prints the value of pi
print(math.e)   # prints the value of e
print(math.sqrt(16))  # prints the square root of 16

Example 2: Using the random Library

The random library is also a built-in library in Python that provides functions for generating random numbers. Here's an example:

import random
print(random.randint(1, 100))  # prints a random integer between 1 and 100
print(random.uniform(0, 1))    # prints a random float between 0 and 1

Example 3: Using the datetime Library

The datetime library is used for working with dates and times. Here's an example:

import datetime
now = datetime.datetime.now()
print(now)  # prints the current date and time
print(now.strftime("%Y-%m-%d %H:%M:%S"))  # prints the current date and time in a specific format

Example 4: Using the requests Library

The requests library is used for making HTTP requests. Here's an example:

import requests
response = requests.get("https://www.example.com")
print(response.status_code)  # prints the status code of the response
print(response.text)         # prints the HTML content of the response

Example 5: Using the pandas Library

The pandas library is used for working with data structures such as DataFrames and Series. Here's an example:

import pandas as pd
data = {"Name": ["John", "Mary", "David"], "Age": [25, 31, 42]}
df = pd.DataFrame(data)
print(df)  # prints the DataFrame

These are just a few examples of how to use Python libraries. There are many more libraries available, each with their own specific uses and functionality.

Note: These examples are simplified and may not work exactly as-is in your environment. You'll need to adjust them according to your needs and the specifics of the library you're using.