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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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9 Top Git Terms You Should have Read By now

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9 Top Git Terms to Read now


GIT is version control system. That means it manages your code versions. However, I have given here most frequently asked terms in interviews.


1. Git Vs GitHub

This is the first question you ( even me also) might confuse about. Git is the version control system. Whereas GitHub is a repository framework. Also, you can say GitHub is Git hosting service.


2. What is Branch

Git is a lightweight version control system. In simple terms, a Branch is a separate line of development. You can have any number of branches in Git.


3. What is Topic

Each branch in Git refers to a particular purpose. So the topic tells about the purpose.


4. Clone

In easy terms, the Clone means copying an existing repository. So you can say it is just a copy of the existing repository.


5. What is Push

You can say Push means updating the existing repository. In other words, developers push their changes to a repository that you set up.


6. Merge

Merge unifies two or more commit history branches. That means it merges two or more committed branches.


7. What is Pull

Pull means fetch from and merge with another local branch.


8. Fetch

In simple words, it means, downloading the objects and refs (Hash id) from another repository.


9. Checkout

It is the scenario, if you want to work with another branch you need to issue checkout. So that you can work with the new branch. And you will not lose any information about the current branch.


References

  1. Useful Guide - How to work with Git 

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