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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 AWS CloudFormation Easily

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AWS CloudFormation is a service that helps you model and set up your Amazon Web Services resources so that you can spend less time managing those resources and more time focusing on your applications that run in AWS.

You create a template that describes all the AWS resources you want (like Amazon EC2 instances or Amazon RDS DB instances), and AWS CloudFormation provides and configures those resources for you.

cloud formation

 

You don't need to individually create and configure AWS resources and figure out what's dependent on what; AWS CloudFormation handles all of that. 

Managing Infrastructure

  • For a scalable web application that also includes a back-end database, you might use an Auto Scaling group, an Elastic Load Balancing load balancer, and an Amazon Relational Database Service database instance. 
  • Normally, you might use each individual service to provide these resources. And after you create the resources, you would have to configure them to work together. All these tasks can add complexity and time before you even get your application up and running. 
  • Instead, you can create or modify an existing AWS CloudFormation template. A template describes all of your resources and their properties. 
  • When you use that template to create an AWS CloudFormation stack, AWS CloudFormation provisions the Auto Scaling group, load balancer, and database for you. After the stack has been created, your AWS resources are up and running. You can delete the stack quickly. which deletes all the resources in the stack. By using AWS CloudFormation, you easily manage a collection of resources as a single unit.

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