onelharrison

#lang racket

(require minikanren)
(require minikanren/numbers)


(define zo (build-num 0))
(define 1o (build-num 1))

(define (factorialo n f)

onelharrison

def coalesce(*values):
    """Return the first non-None value or None if all values are None"""
    return next((v for v in values if v is not None), None)

onelharrison

def safe_cast(value, astype, default = None):
    """Convert one type to another without raising errors"""
    try:
        return astype(value)
    except (TypeError, ValueError):
        pass

    return default

onelharrison

def safe_get(collection, key, default=None):
    """Get values from a collection without raising errors"""

    try:
        return collection.get(key, default)
    except TypeError:
        pass

    try:
        return collection[key]

onelharrison

from functools import reduce


def dig(collection, *keys, default=None):
    """Get values from a potentially nested collection without raising errors"""
    return reduce(lambda x, y: safe_get(x, y, default), keys, collection)

onelharrison

from dataclasses import dataclass
from typing import Optional

@dataclass
class MediumStory:
    title: str
    description: str
    body: str
    published_at: int
    featured_image_url: Optional[str] = None

onelharrison

import time

def extract_medium_story(story):
    medium_story = MediumStory()
    medium_story.title = story["title"]
    medium_story.description = story["description"]
    medium_story.body = story["body"]
    medium_story.published_at = story["published_at"]
    
    # notice in the example data that

onelharrison

import time

from dataclasses import dataclass
from typing import Optional

@dataclass
class Employee:
    name: str
    age: Optional[int] = None
    job_title: str

onelharrison

"""
The following code explores the presentation of contacts
in an on-screen phone book in which a contact's
first name xor last name may be missing and contacts can
be sorted by first name xor last name.

A true sort by first name and last name is implemented as well as
correspending sort procedures with a presentation bias. In effect,
the presentation bias makes the contacts in the on-screen phone book
appear to be sorted by their intended sort key but in really this may

onelharrison

"""
Demo script for reading a CSV file from S3 into a pandas data frame using the boto3 library
"""

import os

import boto3
import pandas as pd