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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 Delete Duplicates in List Faster Way

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Removing duplicates in List simplified using SET method. It's a simple method. Just you need SET and Print to remove duplicates. Removing duplicates is common in Data science projects.

What is list

A list is a collection of elements. The elements can be duplicates or non-duplicates. Today's task is to remove duplicate elements in the List.


Faster way to remove list duplicates

Faster way to remove list duplicates

  • Create a List
  • Use SET
  • Print the result


List with duplicates

my_list = ['The', 'unanimous', 'Declaration', 'of', 'the', 'thirteen','united', 'States', 'of', 'America,', 'When', 'in', 'the', 'Course', 'of', 'human']



Apply set method

>>> non_dupes = set(my_list)



Print Final list

>>> print(non_dupes)



Here, if you observe, there are no duplicates. The duplicates are now removed. It displays only non-duplicate values. 


get rid of duplicates list python


Here 'the' is a duplicate value. That's now removed.

11 top list methods

  1. Append
  2. Extend
  3. Insert
  4. Remove
  5. pop
  6. clear
  7. Index
  8. Count
  9. Sort
  10. Reverse
  11. Copy

Details of List Methods


Append

Adds an item at the end of the list.

Extend

Extends the list by adding all the items.

Insert

Inserts an item at a specified location.

Remove

Removes an item from the list. If there are no items, it gives a value error.

pop

Remove the item at the given position in the list, and return it. If no index is specified, a.pop() removes and returns the last item in the list.


Clear

It removes all the items from the list.

Index

It gets an index for the given value. The index starts from '0'.


Count

It returns the of times a particular value appears.

Sort

It sorts the items.


Reverse

Reverses the items in the list.

Copy

Return a shallow copy of the list.

References

Comments

  1. high technologies solutionsJune 25, 2021 at 10:45 AM

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