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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 Easy Way to Split String Python Partition Method

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Here's a way without the Split function you can split (or extract) a substring. In Python the method is Partition. You'll find here how to use this method with an example.  How to Split the string using Partition method   Returns Left side part Example-1 my_string='ABCDEFGH||10||123456.25|' my_partition=my_string.partition('|')[0] print(my_partition) Output |10||123456.25| ** Process exited - Return Code: 0 ** Press Enter to exit terminal Example-2 Returns from the separator to last of the string. my_string='ABCDEFGH||10||123456.25|' my_partition=my_string.partition('|')[-1] print(my_partition) Output |10||123456.25| ** Process exited - Return Code: 0 ** Press Enter to exit terminal The use of Rpartition to split a string in Python Example-1 Returns except right side last separator. my_string='ABCDEFGH||10||123456.25|' my_partition=my_string.rpartition('|')[0] print(my_partition) Output ABCDEFGH||10||123456.25 ** Process exited - ...
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