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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 Split String: Techniques and Best Practices

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Here is an example for  splitting a string in Python . The functions you need are strip and split to split string, or text.  Here's the string taken for split My task is I want to split address string. Historically, the address is lengthy. It contains the door number, floor number, street number, and street name. Rama Krishna 20/3 ABC street EFG Nagar US 234567 How to Split a string The python split string works in two steps. The first step is to use  strip function , which removes both leading and trailing spaces. Next, use the the split function, which splits the input string, or text into a list. Python program user_address = input("Enter an address") if user_address. strip() : #check that string is not empty (after removing leading #and trailing spaces)     print("Your address is " + user_address) split_address = user_address. split() print(split_address) Output Interactively, it asks the user to enter the address. After the code runs, the address splits i...
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