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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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The Real Command to Wrap Text in Linux

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Fold command in Linux

Here is a command to wrap text in Linux. The wrapping means it prints it in fixed-width column. More importantly, it will not consider spaces between words. The command you need is FOLD.  

Fold command in Linux

Below, you will find two examples on usage of the FOLD command. These are helpful for your project where you need to write a shell script.

Example-1

The following command displays a set of lines with ten characters in each line:

x="aa bb cc d e f g h i j kk ll mm nn" 
echo $x | fold -10

The output of the preceding code snippet is here:

aa bb cc d e f g h i j kk ll m m nn

Example-2

As another example, consider the following code snippet:


x="The quick brown fox jumps over the fat lazy dog. " 
echo $x | fold -10

The output of the preceding code snippet is here:

The quick brown fox jumps over the fat l azy dog.

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