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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 Find Max and Min Quickly in Python List

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Here's logic to find Max and Min values in a List. Without using built-in Max() and Min () functions you can find Max and Min values in a List. For that matter, you need to write a user-defined function. This post is all about how to write it and run.

Finding Max and Min in List


You can achieve this by writing a user-defined function. Here's useful logic and steps to write it precisely.


IN THIS PAGE

  • Write a Function
  • Execute Function
  • Get the result
  • Write Function

You can write an user-defined function to get MAX and MIN values. In this function, I am using the max(), min() built-in functions. The other variables you can use as you wish. Below is the my actual logic.


Python Function to find Maximum and Minimum Easily


Sample Code

def findmaxmin(data): 
ax = max(data) 
by = min(data) 
return(x,y)
data = (109, 98, 88, 7) 
(maximum, minimum) = findmaxmin (data) 
print("Maximum Marks = ", maximum) 
print("Minimum Marks = ", minimum)


Created a Script Using vim editor

Here as the first step, I have written the maxmin.py file in Ubuntu. The function name is  "findmaxmin ".

define function using input arguments

Result


Below command to enter Python. This command, you can issue in Ubuntu where python3 is installed

$ python3

You have now entered Python3.

>>> import maxmin

You will prompt a message that imported successfully without any syntax errors.

Code in the Python Script


How to import python script and run


Below commands, I have issued.

>>> data = (109, 98, 88, 7)
>>> maxmin.findmaxmin(data)


The result is (109, 7)


References

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