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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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2 Best Ways to Concatenate Strings in Python

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Concatenation of strings in Python is possible by using the plus and join method. You can also do it in other ways. But in my point of view, these two are the best methods.


best ways concatenate string python

What are Strings?


A string represents in quotes. Let us see the data. It can have all kinds of data. A lot you can do by manipulating strings. Concatenation is one.


Example for strings 

Stringa='Uncle'
Stringb='is'
Stringc='Married'


Above example, you can see three strings. To make all these strings into a single, you need the concept of concatenation.

What is string concatenation?


String concatenation is a frequent activity in data science. Knowing this concept is helpful in your project and interviews as well.

You can do it using the two best methods. One is you can use plus operator. For the other one, you can use the join method.


#1: Using the plus operator


Stringa='Uncle'
Stringb='is'
Stringc='Married'
print(Stringa + ' ' + Stringb + ' ' + Stringc)


Result:

Uncle is Married


#2: Using the join method with separator.


Stringa='Uncle'
Stringb='is'
Stringc='Married'
a=' '.join([Stringa, Stringb, Stringc])
print(a)


Result:

Uncle is Married


Reference books


Reference links

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