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Pandas: Filtering rows based on row number

Pandas Filter: Exercise-21 with Solution

Write a Pandas program to filter rows based on row numbers ended with 0, like 0, 10, 20, 30 from world alcohol consumption dataset.

Test Data:

   Year       WHO region                Country Beverage Types  Display Value
0  1986  Western Pacific               Viet Nam           Wine           0.00
1  1986         Americas                Uruguay          Other           0.50
2  1985           Africa           Cte d'Ivoire           Wine           1.62
3  1986         Americas               Colombia           Beer           4.27
4  1987         Americas  Saint Kitts and Nevis           Beer           1.98   

Sample Solution:

Python Code :

import pandas as pd
# World alcohol consumption data
w_a_con = pd.read_csv('world_alcohol.csv')
print("World alcohol consumption sample data:")
print(w_a_con.head())
print("\nFilter rows based on row numbers ended with 0, like 0, 10, 20, 30:")
print(w_a_con.filter(regex='0$', axis=0))

Sample Output:

World alcohol consumption sample data:
   Year       WHO region      ...      Beverage Types Display Value
0  1986  Western Pacific      ...                Wine          0.00
1  1986         Americas      ...               Other          0.50
2  1985           Africa      ...                Wine          1.62
3  1986         Americas      ...                Beer          4.27
4  1987         Americas      ...                Beer          1.98

[5 rows x 5 columns]

Filter rows based on row numbers ended with 0, like 0, 10, 20, 30:
    Year             WHO region      ...      Beverage Types Display Value
0   1986        Western Pacific      ...                Wine          0.00
10  1987                 Africa      ...                Wine          0.20
20  1986        South-East Asia      ...                Wine          0.00
30  1986                 Africa      ...               Other          4.48
40  1987                 Europe      ...             Spirits          1.90
50  1985                 Europe      ...               Other          0.30
60  1987  Eastern Mediterranean      ...               Other          0.00
70  1986                 Africa      ...             Spirits          1.02
80  1985                 Africa      ...               Other          0.84
90  1989                 Africa      ...                Wine          0.01

[10 rows x 5 columns]

Click to download world_alcohol.csv

Python Code Editor:


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Previous: Write a Pandas program to find average consumption of wine per person greater than 2 in world alcohol consumption dataset.
Next: Write a Pandas program to select consecutive columns and also select rows with Index label 0 to 9 with some columns from world alcohol consumption dataset.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m