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Top Questions People Ask About Pandas, NumPy, Matplotlib & Scikit-learn — Answered!

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 Whether you're a beginner or brushing up on your skills, these are the real-world questions Python learners ask most about key libraries in data science. Let’s dive in! 🐍 🐼 Pandas: Data Manipulation Made Easy 1. How do I handle missing data in a DataFrame? df.fillna( 0 ) # Replace NaNs with 0 df.dropna() # Remove rows with NaNs df.isna(). sum () # Count missing values per column 2. How can I merge or join two DataFrames? pd.merge(df1, df2, on= 'id' , how= 'inner' ) # inner, left, right, outer 3. What is the difference between loc[] and iloc[] ? loc[] uses labels (e.g., column names) iloc[] uses integer positions df.loc[ 0 , 'name' ] # label-based df.iloc[ 0 , 1 ] # index-based 4. How do I group data and perform aggregation? df.groupby( 'category' )[ 'sales' ]. sum () 5. How can I convert a column to datetime format? df[ 'date' ] = pd.to_datetime(df[ 'date' ]) ...
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Scraping Website: How to Write a Script in Python

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Here's a python model script to scrape a website using the BeautifulSoup.


Scrapping website

Python script

The logic below uses BeautifulSoup Package for web scraping.


import requests

from bs4 import BeautifulSoup

url = "https://www.example.com"

response = requests.get(url)

soup = BeautifulSoup(response.text, "html.parser")

# Print the title of the webpage

print(soup.title.text)

# Print all the links in the webpage

for link in soup.find_all("a"):

    print(link.get("href"))



In this script, we first import the Requests and Beautiful Soup libraries. We then define the URL we want to scrape and use the Requests library to send a GET request to that URL. We then pass the response text to Beautiful Soup to parse the HTML contents of the webpage.

We then use Beautiful Soup to extract the title of the webpage and print it to the console. We also use a for loop to find all the links in the webpage and print their href attributes to the console.

This is just a basic example, but you can use Beautiful Soup to extract any other HTML elements you want from the webpage.

References

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