ryanorsinger

ryanorsinger

# Directions to uninstall and reinstall mysql 5.7

brew uninstall mysql
sudo rm -rf /usr/local/var/mysql
brew install mysql

ryanorsinger

public class Car {
    
    // properties that belong to each object
    String make;
    String model;

    // This runs every time we create the car object. This is the constructor. 
    public Car(String make, String model) {
        this.make = make;
        this.model = model;

ryanorsinger

abstract class Seasoning {}

class Salt extends Seasoning {
    public String toString() {
        return "new " + getClass().getName() + "()";
    }
}

class Pepper extends Seasoning {
    public String toString() {

ryanorsinger

Make a file named pandas_series.py or pandas_series.ipynb for the following exercises.

Given ["kiwi", "mango", "strawberry", "pineapple", "gala apple", "honeycrisp apple", "tomato", "watermelon", "honeydew", "kiwi", "kiwi", "kiwi", "mango", "blueberry", "blackberry", "gooseberry", "papaya"]

1. Create a pandas series called fruits to hold the above data.

2. Run .describe() on the series to see what describe returns for a series of strings.

3. Run the code necessary to produce only the unique fruit names.

ryanorsinger

# Given the pets series, output the number of vowels in each pet species

import pandas as pd
pets = pd.Series([
    "cat",
    "dog",
    "lizard",
    "rock",
    "dragon"
])

ryanorsinger

our trade/craft

gaining insights from data for actionable decisions data science -> applied interdisciplinary science around using data to make decision

practicing data science is a function

1. input
2. process
3. output

data science workflow

ryanorsinger

My liberal-arts (think about programming lanugage like natural language) approach to software engineering and thinking about object orientation

• use clear language to reduce cognitive overhead

• blow off details until you need them

• call things what they are so that what they are is what you call them

• Think of parts of programming languages as a spoken language (Nouns, verbs, etc...)

• Solve the easiest problems first to build emotional wellbeing and momentum

• methods are verbs and verb phrases

• classes/objects are our proper nouns like User, Transaction, Accounts, BlogPost, etc...

ryanorsinger

Useful Libraries

Exploratory Data Analysis

For when you want an overview of a pandas DataFrame with significantly more depth than .describe(), try out https://github.com/pandas-profiling/pandas-profiling. Install with conda install -c conda-forge pandas-profiling or pip install pandas-profiling.

Some features of Pandas Profiling include:

• Essentials like types, unique values, missing values
• Quantile statistics
• Descriptive statistics

ryanorsinger

"ValueError: Length of passed values is 20, index implies 1"

The error message of "ValueError: Length of passed values is 20, index implies 1" most likely comes from comparing a numpy array to a pandas series. Fix: Make both variables the same data type, so they are both a numpy array or they are both a pandas series.

Steps to reproduce:

import numpy as np
import pandas as pd

x = np.array([1, 2, 3, 4, 5])