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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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Data Analytics Engineers - Salaries

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Data Analytics Engineers - Salaries
#Data Analytics Engineers - Salaries and career options:
Some key skills which are very crucial for an employee these days are the ability to communicate disruptive ideas, multi-disciplinary skills with appropriate depth of specialisation, learnability and resilience," said Prithvi Shergill, chief human resources officer, HCL Technologies, the country's fifth-largest technology company.

So, an engineer with 2-3 years' experience working in data analytics can expect a salary of Rs 4-6 lakh in India and $70-80,000 in the US or Europe. 
But without big data skills, the same engineer can earn only Rs 3-5 lakh, according to Anurag Gupta, chief operating officer at Magna Infotech, an IT staffing firm.

  • Experience of 5-6 years in data analytics can help an engineer command a salary of up to Rs 10-12 lakh in the domestic market, according to Kamal Karanth, India MD of staffing firm Kelly Services.
  • Firms like IPsoft, Happiest Minds and Mu Sigma, operating in automation, mobility and analytics solutions as well as cloud-based deployment, are competing in areas that are seeing the fastest growth for the country's IT players. Digital technologies contribute 5-10% of the industry's revenue, according to the National Association for Software and Services Companies.

New York-based IPsoft, which has a facility at Bangalore, pays employees with proficiency in data analytics up to 20% more than what it pays for engineers with proficiency in just coding. The privately-held company has 1,700 employees across 10 offices globally.

"There are fewer than 50,000 machine-learning scientists in the world today who can make sense of big data science," said Arnab Gupta, founder CEO of Opera Solutions, the New Jersey-based predictive analytics firm. Read more.

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