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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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The Perfect Way to Swap two Strings in Python

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Here is the perfect way swap two strings in python. Without a third variable, you can swap strings in Python. With the swap function, you can achieve this. Here's the sample logic.


swap two strings in python

Swap two strings

Multiple arguments you can use in the same function. Here, a and b are arguments for the swap function. You'll get output as swapped when you use the swap function.


def swap(a, b): 
return b,a 


Logic to swap strings.

i = "Hello world"
j = "This is ApplyBigAnalytics" 

(i, j) = swap(i, j) 

print(i) 
print(j) 


Logic to Swap two numbers.

i = 1 
j = 2 

(i, j) = swap(i,j) 

print(i) 
print(j)


Here is output

This is ApplyBigAnalytics 
Hello world 

2 

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