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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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6 Python Directory Commands Useful to Read

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Here's logic to create Python Directory. You need to import the 'OS' package to create Python directory. Here're the list of Python directory commands.

Python How to Create Directory Here's Logic

You can create and delete directories in Python. Here's the helpful logic you can use for your projects. For this, you need to import 'os'. 

Python directories
Python Directories

1. How to Create a Directory

Import os 

os.mkdir('datafiles')

2. How to Change Directory

os.chdir('newdirectory')

3. How to Create a Directory and then Create a file in it

import os 
os.mkdir('datafiles/newfiles'); 
os.chdir('datafiles/newfiles'); 
fp=open('input.txt', 'w') 
fp.write('Hello, Welcome to Programming in Python') 
fp.close()


4. How to Know Present Working Directory

os.getcwd()

5. How to delete a directory

os.rmdir('directoryname')

6. How to get the List of Directories

os.listdir()


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