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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 Write Recursive Function in Python Quickly

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Here's an example to write RECURSIVE function in Python. It acts like a loop that iterate within the function to perform some operation. Precisely, if you call the same function from function is called recursive function.  
 

Recursion in Python


Python recursive function

Here are four rules a developer should know before writing recursive function in Python:

  1. There must be a key variable, which will be responsible for the termination of recursion.
  2. To determine the base value, which the key variable has to meet to reach the termination.
  3. To make sure the key variable must approach the base value in every recursive call.
  4. To make the recursive function terminate when the key variable reaches the base value.


Python recursive example


Here is an example python recursive function.

# This program computes the factorial of a number using recursion
#function definition
def fact(n):
"computes factorial using recursion"
if n == 0:
    return 1
else :
    return n * fact(n - 1)

# Function call
num = input("enter a number:")
num = int(num)
result = fact(num)
print("factorial=", result)


Advantages


Here are the advantages of recursive function.
  • Recursive functions divide the problem into smaller similar fragments and then computes them.
  • The recursive code looks precise and cleaner as compared to using loops. Here is how to call SQL from python

Disadvantages


Here are the disadvantages of recursive function.
  • It's hard to develop
  • Its is hard to understand the recursive functions

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