#data-cleaning code explainers

java

public List<DailySample> backfillMissingDates(List<DailySample> samples, double fillValue) {
    if (samples.isEmpty()) {
        return List.of();
    }

Backfilling gaps in a daily time series in Java

streams time-series treemap

Intermediate 5 steps

python

import pandas as pd
import numpy as np

Cleaning a customer DataFrame with pandas

data-cleaning regex normalization

Intermediate 9 steps

python

import datetime
from dataclasses import dataclass

Parsing fixed-width records in Python

parsing generators dataclasses

Intermediate 8 steps

ruby

require "csv"
 
def parse_transaction_row(line)
  fields = CSV.parse_line(line, headers: false, skip_blanks: true)

Parsing one CSV transaction row in Ruby

parsing type-coercion error-handling

Intermediate 6 steps

python

import re
from email_validator import validate_email, EmailNotValidError
 
_DISPOSABLE_DOMAINS = {

Normalizing signup emails in Python

validation normalization data-cleaning

Intermediate 8 steps