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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 Must read Blockchain Disadvantages for Consumers

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Here are the disadvantages of Blockchain. Below, you will find the list of these.

Blockchain Disadvantages

  1. Lack of privacy
  2. Loss of personal responsibility
  3. Loss of jobs
  4. Reintermediation

1. Lack of Privacy



Public blockchains do not hide any of their data. Instead, everyone can read the complete history of transactions. This level of transparency is frightening for those who want to protect their privacy.

These concerns are understandable when considering the level at which personal data are already collected and utilized by large corporations or intelligence agencies.




2. Loss of Responsibility



Loss of personal responsibility is often considered a consequence of disintermediation. Intermediaries not only bring different parties of a contract together but may also provide guarantees. They offer reconciliation in cases when transactions do not work out as intended, and they are also obliged to take responsibility for their actions.

The shift from trust in people and human organizations to trust in protocols and technology may lead to a loss of personal service and personal responsibility.




Disadvantages
Disadvantages



3. Loss of Jobs


Automation and standardization play a profound cause to lose many jobs. Third parties, such as banks, brokers, custodians, money-transfer agencies, and notaries directly tied to their roles as intermediaries.

All these jobs could be at risk when a sea portion of financial transactions automated by using Blockchain technology.

 


4. Reintermediation


The complexity and its open legal status discourage individuals and organizations from using Blockchain technology.

If people prefer third-party services instead of using Blockchain technology, it surely hurdles the real usage.


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