Flake8 snippets

aggregate_flake8_results.py

# flake8 > C:/Temp/StyleGuide.csv 

import os 

os.chdir('C:/Temp') 
import pandas as pd 

for errors_file in ['StyleGuide1.csv', 'StyleGuide2.csv']: 
    df = pd.read_csv(errors_file, sep=':') 
    df.columns = ['FilePath', 'LineNo', 'ColumnNo', 'ErrorMessage'] 
    df = df[['FilePath', 'LineNo', 'ColumnNo', 'ErrorMessage']] 
    df['ErrorCode'] = df['ErrorMessage'].str[:5] 
    df['ErrorMessage'] = df['ErrorMessage'].str[6:] 

    agg = df.groupby(['ErrorCode', 'ErrorMessage']).size().reset_index(name='Count') 
    agg.sort_values(['Count', 'ErrorCode'], inplace=True) 
    agg.to_csv("_agg" + errors_file, index=False) 

flake8_diff.sh

# get files that have been changed in the 5 last commits 
$ git diff HEAD HEAD~5 --name-only > C:/Temp/diff_files.txt                                                                                                             

# feed each file to flake8 
$ cat C:/Temp/diff_files.txt | grep .py | xargs flake8 --filename   

# single-line command
git diff HEAD HEAD~5 --name-only | grep .py | xargs flake8 --filename