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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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4 Top Applications That Running From Cloud

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Data Storage and Backup Box.com, Mozy, Joukuu are the applications offering data storage and backup services in cloud.

Box.com offers drag and drop service for files. It just required to drop the files into Box and access from anywhere. 

Mozy offers online backup service for files during a data loss.

1. Business Applications

  • MailChimp - It offers an e-mail publishing platform. It is widely employed by the businesses to design and send their e-mail campaigns. 
  • Chatter - Chatter app helps the employee to share important information about organization in real time. One can get the instant feed regarding any issue. 
  • Google Apps - for Business Google offers creating text documents, spreadsheets, presentations, etc., on Google Docswhich allows the business users to share them in collaborating manner. 
  • Quickbooks - It offers online accounting solutions for a business. It helps in monitoring cash flow, creating VAT returns and creating business reports.

2. Management Applications

There are apps available for management task such as time tracking, organizing notes. Applications performing such tasks are discussed below: SN Application Description.
  1. Toggl-  It helps in tracking time period assigned to a particular project.
  2. Evernote- Evernote is an application that organizes the sticky notes and even can read the text from images which helps the user to locate the notes easily.
  3. Outright-  It is an accounting app. It helps to track income, expenses, profits and losses in real time.

3. Social Applications

There are several social networking services providing websites such as Facebook, Twitter, etc. SN Application Description

1 Facebook- Facebook offers social networking service. One can share photos, videos, files, status and much more.

2 Twitter- Twitter helps to interact directly with the public. One can follow any celebrity, organization and any person, who is on twitter and can have latest updates regarding the same.

Entertainment Applications

4. SN Application Description

  • Audiobox.fm - It offers streaming service, i.e., music can be stored online and can be played from cloud using service's own media player.
  • Art Applications 
  • Moo-  It offers art services such as designing and printing business cards, postcards and minicards.

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