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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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Python 'getsizeof' Command the Real Purpose

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Here's a sample python program to get the size of a List array.  Getting the number of elements present in a List is not easy. So how to get this? To do you need the 'getsizeof' command.

Import 'sys' Library.

You need to import the 'sys' library to use the SIZE commands. 

>>> import sys

Congrats to you since you have now imported the SYS library. The command name is "getsizeof".

Check the below example.

print("An Integer:")
i = int(100)
print(sys.getsizeof(i))

The result will be: 100

What is the size command?  - is to get the size of elements. It gives the result based on the object you are being used. Suppose, if you use Strings, you will get String length.

Python Command to get the Size of an Object


How to use the 'getsizeof' command?

Example:1

print("Empty string:")
empty_string = ""
print(sys.getsizeof(empty_string))

Example:2

print("A normal string")
s = "Hello world"
print(sys.getsizeof(s))

Example:3

print("Increasing string:")
for i in range(0,5):
empty_string = empty_string + chr(i)
print(sys.getsizeof(empty_string))

Sources

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