Build a Practical Filtering, Grouping, and Aggregation Example in Data Analysis with Python

Define the build target

For Filtering, Grouping, and Aggregation, analyze a small CSV dataset from load through a grouped summary and save the cleaned result or report. Build the boundary case using this implementation lens: Use pandas DataFrames, schema expectations, missing values, grouping, joins, time/categorical data, validation checks, and reproducible reports.

Keep the Filtering, Grouping, and Aggregation build centered on these technical constraints: Schema and data types. Missing/invalid values. Apply them through this path lens: Use pandas DataFrames, schema expectations, missing values, grouping, joins, time/categorical data, validation checks, and reproducible reports. Use pandas DataFrames, schema expectations, missing values, grouping, joins, time/categorical data, validation checks, and reproducible reports.

Implement the core behavior

Implement Filtering, Grouping, and Aggregation around the module artifact—a working filtering, grouping, and aggregation example with an explicit success and failure check—and keep the implementation specific to this path context: Use pandas DataFrames, schema expectations, missing values, grouping, joins, time/categorical data, validation checks, and reproducible reports.

import pandas as pd

df = pd.read_csv('orders.csv')
df['amount'] = pd.to_numeric(df['amount'], errors='coerce')
clean = df.dropna(subset=['customer_id', 'amount'])
summary = (clean.groupby('customer_id', as_index=False)
                 .agg(order_count=('amount', 'size'), total=('amount', 'sum')))
print(summary.sort_values('total', ascending=False).head())

python3 analysis.py

A grouped customer summary with invalid numeric rows removed explicitly.

practice/\n├── README.md\n├── filtering-grouping-and-aggregation-build.py\n└── evidence/\n    └── expected-result.txt

Run the complete path

Run one realistic Filtering, Grouping, and Aggregation case end to end and record the required evidence: the relevant output, test, log, query result, or rendered state for Filtering, Grouping, and Aggregation. Interpret the result through this path context: Use pandas DataFrames, schema expectations, missing values, grouping, joins, time/categorical data, validation checks, and reproducible reports.

Change one meaningful condition

Modify one condition central to Filtering, Grouping, and Aggregation using this path context: Use pandas DataFrames, schema expectations, missing values, grouping, joins, time/categorical data, validation checks, and reproducible reports. Predict the new result before rerunning the same workflow.

Verify the artifact

Your deliverable is a working filtering, grouping, and aggregation example with an explicit success and failure check.

Common mistakes to avoid

• Silent type coercion.
• Rows dropped without count check.
• Duplicate join keys.
• Not distinguishing missing from zero.