List chapter 10

Link to ThinkPython

Exercise 1

Write a program that allows the user to enter a string. It then prints a table of the letters of the alphabet in alphabetical order which occur in the string together with the number of times each letter occurs. Case should be ignored. A sample run of the program might look this this:

import string

def letterCount(text):
    alphabet = string.ascii_lowercase
    text = text.lower()

    letters = {}

    for letter in text:
        if letter in alphabet:
            if letters.get(letter):
                letters[letter] += 1
            else:
                letters[letter] = 1
    keys = letters.keys()
    keys.sort()

    for key in keys:
        print(key, letters[key])

letterCount("Abcde fg ggfd x i !")

Exercise 2

Give the Python interpreter’s response to each of the following from a continuous interpreter session:

>>> d = {'apples': 15, 'bananas': 35, 'grapes': 12}
>>> d['bananas']
35
>>> d['oranges'] = 20
>>> len(d)
4
>>> 'grapes' in d
True
>>> d['pears']
Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    d['pears']
KeyError: 'pears'
>>> d.get('pears', 0)
0
>>> fruits = d.keys()
>>> sorted(fruits)
['apples', 'bananas', 'grapes', 'oranges']
>>> print(fruits)
dict_keys(['bananas', 'oranges', 'apples', 'grapes'])
>>> del d['apples']
>>> 'apples' in d
False

# make these tests work...
# new_inventory = {}
# add_fruit(new_inventory, 'strawberries', 10)
# testEqual('strawberries' in new_inventory, True)
# testEqual(new_inventory['strawberries'], 10)
# add_fruit(new_inventory, 'strawberries', 25)
# testEqual(new_inventory['strawberries'] , 35)

from test import testEqual

def add_fruit(inventory, fruit, quantity=0):
    value = inventory.get(fruit, 0)
    inventory[fruit] = value + quantity

# make these tests work...
new_inventory = {}
add_fruit(new_inventory, 'strawberries', 10)
testEqual('strawberries' in new_inventory, True)
testEqual(new_inventory['strawberries'], 10)
add_fruit(new_inventory, 'strawberries', 25)
testEqual(new_inventory['strawberries'] , 35)

Exercise 3

Here’s a table of English to Pirate translations:

English Pirate
sir matey
hotel fleabag inn
student swabbie
boy matey
madam proud beauty
professor foul blaggart
restaurant galley
your yer
excuse arr
students swabbies
are be
lawyer foul blaggart
the th'
restroom head
my me
hello avast
is be
man matey 
from test import testEqual
import string

def translate(text):
    slang_dictionary = {"sir": "matey", "hotel": "fleabag inn", "student": "swabbie", "boy": "matey", "madam": "proud beauty", "professor": "foul blaggart", "restaurant": "galley", "your": "yer", "excuse": "arr", "students": "swabbies", "are": "be", "lawyer": "foul blaggart", "the": "th'", "restroom": "head", "my": "me", "hello": "avast", "is": "be", "man": "matey"}
    text_list = text.split(" ")
    panctuation = string.punctuation
    slang_list = []

    for word in text_list:
        # check for panctuation
        keepFront = ""
        keepBack = ""

        if word[-1] in panctuation:
            keepBack = word[-1]
            word = word[:-1]
        if word[0] in panctuation:
            keepFront = word[0]
            word = word[1:]

        # translate
        if slang_dictionary.get(word, False):
            slang_list += [keepFront + slang_dictionary[word] + keepBack]
        else:
            slang_list += [keepFront + word + keepBack]

    slang_text = " ".join(slang_list)
    return slang_text

text = "hello my man, please excuse your professor to the restroom!"
testEqual(translate(text), "avast me matey, please arr yer foul blaggart to th' head!")

results matching ""

    No results matching ""