Pandas Groupby python

Question

I have a dataset with the names of the countries and some other information such as salary in the file. The problem is that I need to find mean salaries of employees in the file grouped by country_id and city in ranges (0, 5000] (5000, 10000] and (10000, 15000]. I was using this method but the resultant table is not as what I want. Can you help me with that?

df = file.groupby(['country_id',"city"])['salary'].mean().reset_index(name="mean") 
bins = [0, 5000]
df['binned'] = pd.cut(df['mean'], bins)
print(df)

Answer 1

I think if your range of the salary bin is always 5000, you can create the bin number of each row by using / operator and math.ceil

import math
df = pd.DataFrame({
    'salary':[
        1231, 5000, 7304, 10000, 12302, 15000,
        1001, 4900, 6012, 9123, 11231, 14923
    ],
    'country': [
        'USA','USA','USA','USA','USA','USA',
        'UK','UK','UK','UK','UK','UK'
    ]
})
df['salary_bin_number'] = (df['salary'] / 5000).apply(lambda x: math.ceil(x))
df.head()

salary	country	salary_bin_number
1231	USA	1
5000	USA	1
7304	USA	2
10000	USA	2
12302	USA	3

With the salary_bin_number, you can create the column name of bin by using below code

df['salary_range_str'] = df['salary_bin_number'].apply(
    lambda bin_number: f'({(bin_number-1) * 5000}-{(bin_number) * 5000}]'
)

Then group by salary_range_str and country to calculate the average salary in each country,salary_range_str.

df = df.groupby(['country', 'salary_range_str'])['salary'].mean().reset_index()

Finally, pivot the column salary_range_str to columns.

df = pd.pivot_table(df, index='country', columns='salary_range_str', values='salary')

Output

country	(0-5000]	(10000-15000]	(5000-10000]
UK	2950.5	13077	7567.5
USA	3115.5	13651	8652