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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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Trending IT Skills Grab Opportunities

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Great demand for Mobile developers and Security professionals. Read my other article on "15 Rapidly Growing IT Jobs". Growing areas are in Internet of things and 3D printing.
Trending IT skills

Then we need to know what is 3D printing?

3D printing is not necessarily transforming IT. It’s that it's a new technology that's transforming other industries like manufacturing and biomedical sectors," Laura McGarrity, vice president of digital marketing strategy for Mondo, told eWEEK.

"It does create new job growth within the IT industry. Benefits to consumers include the ability to try and re-work prototypes before going to the market - consumers can expect products made for their specific needs. An excellent growth for Data related and Statistics jobs. Data and statistics are everywhere now, and there is high demand for scientists who can analyze the data," she said.

"A data scientist needs to be able to manage data, create predictions, and communicate the results.

What trend IT professionals need to follow?

The only mantra, IT professionals need to follow is "Be open to learning at all times and working in agile teams and work cultures," she said. "Educate yourself by networking and attending meet-ups and code camps

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