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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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Udemy top selling courses to learn today huge jobs in the market

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Courses
You can learn any course you want. The basic rule is that course should have market value. So you may ask what is market value - that means you need more jobs in job market. That kind of course is good to start. I am giving here most popular courses.

The list of course most and best sellers on Udemy platform. You also can select and try these course as you want.



 IT and Software
  • CCNP wireless certification
  • Ethical hackingInternet of Things
  • ITIL foundation certification
  • Network+ 2015
  • Security+
  • VMWare

Development

  • Construct 3
  • CryEngine
  • ember.js
  • Hadoop / Big Data/MapReduce/Apache hive & pig
  • Laravel 5
  • Matlab
  • MongoDB
  • PhoneGap
  • Php7
  • Powershell
  • Puppet
  • React Native
  • React.js
  • Scala
  • Selenium
  • UDK
  • Unreal Engine 4

Business Intelligence

  • CPA exam
  • Project Management PMP
  • Tableau 9.0
  • VBA
  • Business Analysis
  • Big Data for Business 

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