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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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SAN Vs NAS Benefits, Differences

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SANs are particularly helpful in backup and disaster recovery. Within a SAN, data can be transferred from one storage device to another without interacting with a server. 

This speeds up the backup process and eliminates the need to use server CPU cycles for backup. 

Also, many SANs utilize Fibre Channel technology or other networking protocols that allow the networks to span longer distances geographically.

Benefits of SAN (storage area network)

  1. Feasible for companies to keep their backup data in remote locations.
  2. Utilizing a SAN can also simplify some management tasks, potentially allowing organizations to hire fewer IT workers or to free up some IT workers for other tasks. It is also possible to boot servers from a SAN, which can reduce the time and hassles involved in replacing a server.
  3. Before the advent of SANs, organizations generally used direct-attached storage (DAS). As the name implies, direct-attached storage is directly attached to the server, residing either on the server or in a standalone storage device that is not part of a separate storage networking environment.
  4. Many smaller organizations continue to use DAS today because it offers lower upfront costs than deploying a SAN. For larger companies, the benefits of a SAN often outweigh the costs.
  5. Sometimes people confuse the term SAN with the term NAS, which stands for "network-attached storage." The key to distinguishing the two lies in the last term of each acronym: a SAN (storage area network) is an actual network, while NAS (network-attached storage) refers to a storage device, typically in an IP network.
  6. While SANs provide block-level storage for servers, a NAS device provides file-level storage for end users.
  7. For example, the mail application on your company servers might utilize a SAN to store all the messages, contacts and other data it requires; by contrast, an end user would use a NAS device to save files, such as word processing documents or spreadsheets. Operating systems see a SAN as a disk, while they see a NAS device as a file server.

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