I have a DataFrame like this one:
customer_type age satisfaction design food wifi service distance
Loyal 28 Not Satisfied 0 1 2 2 13.5
Loyal 55 Satisfied 5 3 5 4 34.2
Disloyal 36 Not Satisfied 2 0 2 4 55.8
Disloyal 28 Not Satisfied 3 1 2 2 13.5
Disloyal 33 Not Satisfied 2 1 2 2 13.5
Disloyal 35 Not Satisfied 2 1 2 2 13.5
Disloyal 39 Not Satisfied 1 1 2 2 13.5
Disloyal 31 Not Satisfied 2 1 2 2 13.5
Loyal 28 Not Satisfied 0 1 2 2 13.5
Disloyal 31 Not Satisfied 2 1 2 2 13.5
Disloyal 40 Not Satisfied 2 1 2 2 13.5
Disloyal 35 Not Satisfied 2 1 2 2 13.5
Disloyal 35 Not Satisfied 2 2 2 2 13.5
I want to find out the characteristics of the Disloyal and Not Satisfied customers that are between 30 and 40 years old, grouping them by the service they have rated:
service ratings_count age age_count population_pct
design 8 40 1 7.69
36 1 7.69
35 3 23.07
33 1 7.69
31 2 15.38
food 1 35 1 7.69
I suspect I have to use melt but I can’t figure out how to groupby from there.
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Answer
With the following toy dataframe, inspired by yours but a bit more heterogeneous:
import pandas as pd
df = pd.DataFrame(
{
"customer_type": [
"Loyal",
"Loyal",
"Disloyal",
"Disloyal",
"Loyal",
"Disloyal",
"Disloyal",
"Disloyal",
"Loyal",
"Disloyal",
"Disloyal",
"Loyal",
"Disloyal",
],
"age": [28, 55, 27, 31, 42, 35, 39, 31, 28, 51, 40, 35, 35],
"satisfaction": [
"Not Satisfied",
"Satisfied",
"Not Satisfied",
"Not Satisfied",
"Not Satisfied",
"Not Satisfied",
"Not Satisfied",
"Not Satisfied",
"Not Satisfied",
"Satisfied",
"Not Satisfied",
"Not Satisfied",
"Satisfied",
],
"design": [0, 5, 2, 4, 2, 2, 1, 0, 1, 2, 0, 2, 1],
"food": [1, 3, 0, 0, 1, 0, 1, 0, 1, 0, 1, 3, 2],
"wifi": [2, 5, 2, 1, 2, 2, 0, 0, 1, 2, 2, 0, 2],
"service": [2, 4, 1, 2, 2, 2, 0, 2, 3, 0, 1, 2, 2],
"distance": [
13.5,
34.2,
55.8,
21.2,
23.5,
13.5,
9.0,
13.5,
13.5,
22.7,
13.5,
13.5,
18.4,
],
}
)
Here is one less subtel, although easier, way to do it:
# Setup
amenities = ["design", "food", "wifi", "service"]
dfs = []
new_df = df[
df["age"].between(30, 40)
& (df["customer_type"] == "Disloyal")
& (df["satisfaction"] == "Not Satisfied")
]
# Iterate on each amenity, groupby age and add other columns/values
for amenity in amenities:
temp_df = (
new_df[new_df[amenity] > 0]
.groupby("age")
.agg({amenity: "count", "distance": "mean"})
.reset_index(drop=False)
.rename(columns={amenity: "age_count", "distance": "distance_mean"})
.pipe(
lambda df_: df_.assign(
population_pct=(100 * df_["age_count"] / df_["age_count"].sum()).round(
2
)
)
)
)
temp_df.loc[0, "amenities"] = amenity
temp_df.loc[0, "ratings_count"] = temp_df["age_count"].sum()
temp_df = pd.concat(
[
temp_df,
new_df[(new_df[amenity] != 0)]
.sort_values(by=["age"])
.groupby("age")
.agg({amenity: list})
.reset_index(drop=True),
],
axis=1,
)
temp_df = temp_df.rename(columns={amenity: "ratings"})
temp_df["ratings"] = temp_df["ratings"].apply(lambda x: x[0] if len(x) == 1 else x)
dfs.append(temp_df)
# Get final dataframe and cleanup
new_df = (
pd.concat(dfs)
.fillna(method="ffill")
.reindex(
columns=[
"amenities",
"ratings_count",
"age",
"age_count",
"ratings",
"distance_mean",
"population_pct",
]
)
.astype({"ratings_count": "int"})
.set_index(["amenities", "ratings_count"])
)
So that:
print(new_df)
# Output
age age_count ratings distance_mean population_pct
amenities ratings_count
design 3 31 1 4 21.20 33.33
3 35 1 2 13.50 33.33
3 39 1 1 9.00 33.33
food 2 39 1 1 9.00 50.00
2 40 1 1 13.50 50.00
wifi 3 31 1 1 21.20 33.33
3 35 1 2 13.50 33.33
3 40 1 2 13.50 33.33
service 4 31 2 [2, 2] 17.35 50.00
4 35 1 2 13.50 25.00
4 40 1 1 13.50 25.00
From here, you can filter ratings_count <=2 like this:
print(new_df[new_df.index.get_level_values(1) <= 2])
# Output
age age_count ratings distance_mean population_pct
amenities ratings_count
food 2 39 1 1 9.0 50.0
2 40 1 1 13.5 50.0