From the class Code Toolkit Python · Fall 2021

Word Dictionary

Week 13

week13-json.py

# Week 12 in-class code
#
# This code builds on the homework from week 11 by saving the contents
# of the dictionary into a file called dictionary.json when the
# program exits, and attempting to read from that file when the
# program runs
#
# This is Python code that would go in a .py file that you would edit
# in Atom and run on the command line with the following command:
#
# $ python3 week12-json.py

import json
import os

dictionary = {}

try:
    f = open("dictionary.json","r")
    file_contents = f.read()
    dictionary = json.loads(file_contents)
except:
    print("File not found.")

print( "Welcome to the dictionary.")
num_words = len(dictionary)
print("I know " + str(num_words) + " words." )

dictionary["apple"] = "a red or green fruit"
dictionary["banana"] = "a yellow or brown fruit"
dictionary["carrot"] = "an orange vegetable"

user_text = input("Please type a word: ")
while user_text != "exit":

    if user_text in dictionary:
        print("The definition of that word is:")
        print("  " + dictionary[user_text])
    else:
        print("I don't know that word.")
        yn = input("Would you like to add it? y/n")
        if yn == "y":
            definition = input("Great! Type the definition: ")
            dictionary[user_text] = definition
        else:
            print("OK that's fine")

    user_text = input("Please type a word: ")

print("Bye!")

f = open("dictionary.json","w")
output = json.dumps(dictionary)
f.write(output)
f.close()

Week 15

cgi-bin/dictionary.py

#!/usr/bin/python3

import cgi
import os
import json

inputs = cgi.FieldStorage()

print("Content-Type: text/html")
print("")

dictionary = {}

# Error handling technique 1:
if os.path.exists("dictionary.json"):
    f = open("dictionary.json","r")
    file_contents = f.read()
    dictionary = json.loads(file_contents)

if "definition" in inputs:
    word = inputs["word"].value
    definition = inputs["definition"].value
    dictionary[word] = definition
    f = open("dictionary.json","w")
    output = json.dumps(dictionary)
    f.write(output)
    f.close()
    print("Thanks for the word!")

elif "word" in inputs:
    user_text = inputs["word"].value

    if user_text in dictionary:
        print("The definition of {w} is:".format(w=user_text))
        print("  " + dictionary[user_text])
    else:
        print("hm, I don't know the word " + user_text)
        html = """
        <form action='/cgi-bin/dictionary.py'>
        <input type='hidden' name='word' value='{w}'>
        Enter a definition for it: <input name='definition' type='text'>
        <input type='submit' value='Lookup'>
        </form>
        """.format(w=user_text)
        print(html)
        exit()

print("I know {num} words.".format(num=len(dictionary)))
html = '''
<form action='/cgi-bin/dictionary.py'>
Type a word: <input name='word' type='text'>
<input type='submit' value='Lookup'>
</form>
'''
print(html)

dictionary.json

{"carrot": "orange vegetable"}