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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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Offline Authentication - The Top Differences Between RSA and Entrust Tokens

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RSA token and Entrust token both are public-key providers. In the process of identity management, both play a typical role. 

Once you register with token providers, you will get one private Token. You need to enter both a private PIN and a Token number displayed on the App.

These tokens are mandatory for financial projects. Else they have to pay hefty penalties by non following compliance. Also, check AWS Encryption Top Supported Features.


Entrust Mini Token.

Entrust Token.


Entrust provides both private and public keys to access secure domains.
  • Time-based OATH TOTP algorithm (OT version).
  • Supports PVN validation.
  • First, you need to enter the private PIN and then Token.

RSA Token.

RSA Token.

RSA provides both private and public keys. Both the keys you need to enter to log in to financial or secure servers.
  • Identity management.
  • Both Soft token and Hard tokens available.
  • With the registered token, you can access multiple devices.
  • Finger Print based tokens available
  • Face recognition Tokens available.
  • RSA uses a machine learning approach to provide the right token based on the risk study.

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