[Courses] [python] Lesson 6: Functions and dictionaries

[Prana Peddi]

My answers below:
Thanks,
Prana
===================== Homework ===========================

>
> 1. Write a function that takes a dictionary as argument, chooses a random
>   key from that dictionary, and returns the key and its value as a tuple.
>
>   In other words, if you used that urls dictionary I defined above,
>   you would pass urls as the argument to the function, and the function
>   might return something like (LinuxChix", "http://linuxchix.org").
>
> #! /usr/bin/python
import random

quest = {"What are the colors of the US flag?" : "Red, white, blue",
        "Who is the President of the United States?" : "Barack Obama",
        "Who is the Vice President of the United States?" : "Joe Biden",
        "Who wrote the Declaration of Independence?" : "Thomas JEFFERSON",
        "Who was the first President of the United States?" : "GEorge
Washington",
        }

def getrandomsample(dictname):
        key = random.choice(dictname.keys())
        return (key, dictname[key])

tup = getrandomsample(quest)
print tup[0], tup[1]

2. Use the function you just defined to make a flashcard program.
>   The flashcards can be on any subject you want (or a mix of
>   subjects).  Make a dictionary of questions and answers -- the keys
>   are the questions, the answers are the values. Then use your
>   function to pick a random question/answer pair, print the question
>   and wait for the user to hit return. Then print the answer.
>   (The user can keep track of whether she got it right.)
>
>   By the way, if you ever need to use strings with non-ASCII characters
>   -- like if you're making flashcards for a language besides English --
>   you can specify an encoding with a comment near the top of your program
>   (e.g. right after the shebang line, if any) like this:
> # -*- coding: utf-8 -*-
>

#! /usr/bin/python
import random

quest = {"What are the colors of the US flag?" : "Red, white, blue",
        "Who is the President of the United States?" : "Barack Obama",
        "Who is the Vice President of the United States?" : "Joe Biden",
        "Who wrote the Declaration of Independence?" : "Thomas JEFFERSON",
        "Who was the first President of the United States?" : "GEorge
Washington",
        }

def getrandomsample(dictname):
        key = random.choice(dictname.keys())
        return (key, dictname[key])

while(1):
        tup = getrandomsample(quest)
        t = raw_input("{0}\n".format(tup[0]))
        if (t == "q"):
                print "Exiting"
                break
        else:
                print tup[1]


3. Change your flashcard program so that the user has to type the answer,
>   and you compare it against the right answer and keep track of how
>   many were answered right or wrong.
>
>   Note: you may find this is kind of a pain, because if you make any
>   typos or add extra spaces or anything you don't get credit for a
>   right answer. If you find this to be a problem, do you have any ideas
>   for ways you could make it more flexible?
>

#! /usr/bin/python
import random

quest = {"What are the colors of the US flag?" : "Red, white, blue",
        "Who is the President of the United States?" : "Barack Obama",
        "Who is the Vice President of the United States?" : "Joe Biden",
        "Who wrote the Declaration of Independence?" : "Thomas JEFFERSON",
        "Who was the first President of the United States?" : "GEorge
Washington",
        }

def getrandomsample(dictname):
        key = random.choice(dictname.keys())
        return (key, dictname[key])

def checkresult(str1, str2):
        flag = True
        str1 = str1.strip().lower().split()
        str2 = str2.strip().lower().split()
        if(len(str1) == len(str2)):
                for i in range(len(str1)):
                        if str1[i] != str2[i]:
                                flag = False
                                break
        else:
                flag = False
        return flag

rt = 0
wr = 0
while(1):
        flag = True
        tup = getrandomsample(quest)
        t = raw_input("{0}\n".format(tup[0]))
        if (t == "q"):
                print "Exiting"
                break
        else:
                if checkresult(tup[1], t) :
                        print "That's right!"
                        rt += 1
                else:
                        print "Sorry, Wrong. The Answer is
{0}.".format(tup[1])
                        wr += 1
print "Your score: {0}/{1}".format(rt, rt+wr)