Answers for "filter dataframe based on multiple column value"

Python

how to filter pandas dataframe column with multiple values

# Multiple Criteria dataframe filtering
movies[movies.duration >= 200]
# when you wrap conditions in parantheses, you give order
# you do those in brackets first before 'and'
# AND
movies[(movies.duration >= 200) & (movies.genre == 'Drama')]

# OR 
movies[(movies.duration >= 200) | (movies.genre == 'Drama')]

(movies.duration >= 200) | (movies.genre == 'Drama')

(movies.duration >= 200) & (movies.genre == 'Drama')

# slow method
movies[(movies.genre == 'Crime') | (movies.genre == 'Drama') | (movies.genre == 'Action')]

# fast method
filter_list = ['Crime', 'Drama', 'Action']
movies[movies.genre.isin(filter_list)]

Posted by: Guest on February-10-2021

Source

filter dataframe by two columns

#tl;dr use the '&' opperator and not the word 'and'
print(df)
OUTPUT
  Name  Age
0  Joe   23
1  Tom   54
2  Joe   34
3  Tom   42
4  Joe   23
5  Tom   54
6  Joe   34
7  Tom   42

tom_and_42 = df[(df["Name"]=="Tom") & (df["Age"]==42)] 

print(tom_and_42)
OUTPUT
  Name  Age
3  Tom   42
7  Tom   42

Posted by: Guest on July-21-2021

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