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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 Understand the 'ps' Command output in Linux

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You can get process details by using the ps command. Those are number of processes running in a current Session, and other parameters about the process.   Here is all about how to use ps command in Linux. How to use ps command Here's an example that is how it appears when you issue the 'ps' command. PID (Process Id) - It is the process identification number. TTY(Terminal name) - associated with this process TIME(Time) - the format is hh: mm: ss (Hours, Minutes, and Seconds). Cumulated time of that particular process. CMD (Executable Command name). You May Also Like: PS Command Options in Linux How to understand slave/master terminal Here is all about Slave and Master terminal. The pts/0 is the slave terminal. The pts means pseudo terminal slave. Raise your knowledge by bringing in these quick definitions. LINUX - DIFFERENCE BETWEEN TTY AND PTS. In reality, the terminals are two types. One is ptmx (Master) and pts (Slave). The master terminal holds the details of slaves. Tho...
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