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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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How to Find Folder Space in Linux Easily

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Here's an example that shows how to use find command to get directory utilized space in Linux. Many of a time during production support, or when crontab jobs failed, the reasons behind is space shortage of a directory.

Folder space


The find is handy you can use to get utilized space of a directory. That helps you to delete unnecessary files (that actually make some space).


Linux find command


Here's the find command that I have used in our project. You will find here the detailed explanation of this command and how to use it.


find /home/srini -xdev -ls | sort +6rn | head -20


Part#1: Directory path


In the first part,  after the find you need to give the directory's path for which folder you are going to find space.


Part#2: Option -xdev


The second part is -xdev, which gives the space usage of all the subdirectories.


Part#3: Option -ls


The next part is the -ls option that provides a sorted list of all the subdirectories. 

Part#4: Sort command


Then, the sort command sorts based on the value +6rn.


Sort options


-n Sort numerically (10 will sort after 2), ignore blanks and tabs 
-r Reverse the order of sort 
-f Sort upper- and lowercase together 
+x Ignore first x fields when sorting


Part#5: Option +xrn


The value +6 states to ignore 6 columns in the sort. The option +rn sorts in descending order of memory.


Sort command


Part#6: Option head -20


The head -20 gets the top 20 rows of directories details.

The command you can use to find the folders which takes more space.

Tip#1 I have gone through the best books and Udemy courses. I am giving here for your reference. Here is the book on Bash scripting and Udemy course is Bash Mastery helpful to know more.

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