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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 Interface Vs. Class: What's the Difference

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Here are the differences between Class and Interface in Python. Python class can have all concrete methods. But interface does not have single concrete method. Here you'll know about What's abstract method Abstract Class: How to Create it Rules to Write an Interface How to Create Abstract Class How to Create an Interface What's abstract method The abstrcat method is one which does not have body. from abc import ABC, abstract method class name_class(ABC): # abstract class @abstractmethod def name_method(self): #abstract method without body pass The interface is used when all the features are needed to be implemented differently for different objects. Rules to Write an Interface All methods of an interface should be abstract. You cannot create an interface object. If any class implements an interface, then you need to define all the methods given in that interface in child class. You need to declare all methods as abstract if that class does not implement the interface How to...
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