PythonLesson 16 of 16

Final project: text statistics in Python

Time to put it all together. You'll write a program that reads a coffee shop review and finds out which words it uses most.

Key points

lower() and replace() tidy the text, split() cuts it into words
A dictionary makes a great counter: counts[word] = counts.get(word, 0) + 1
sorted(..., key=function) sorts by whatever the function returns
The minus before count puts big numbers first; the word breaks ties
top[:3] is a slice with the first three pairs

Example

text = "Hello, hello world!"clean = text.lower().replace(",", "").replace("!", "")words = clean.split()print(words) counts = {}for word in words:    counts[word] = counts.get(word, 0) + 1print(counts)

Punctuation is gone, every word is lowercase, and the dictionary counted each one. hello shows up twice even though one had a capital letter.

Task

How to use the editor⌘ Enter or Ctrl Enter runs the code, ⇧ ⌘ Enter checks the task.Tab and Shift Tab indent the line or the selection; Esc, then Tab leaves the editor.The check compares what the program printed with the task; spaces at line ends do not matter.After two failed checks you may open the solution. Your code is kept in this browser.

Finish the program: count_words must return a dictionary of each word and how many times it appears, and at the end print the three most frequent words like coffee: 3.

text = "Coffee is hot. The coffee is fresh, the cake is sweet. Coffee time!" def clean_words(text):    for mark in ".,!?":        text = text.replace(mark, "")    return text.lower().split() def count_words(words):    counts = {}    # TODO: count how many times each word appears    return counts def by_count(pair):    word, count = pair    return (-count, word) words = clean_words(text)counts = count_words(words)print("Words:", len(words))print("Unique:", len(counts))top = sorted(counts.items(), key=by_count)# TODO: print the three most frequent words as "word: count"

text = "Coffee is hot. The coffee is fresh, the cake is sweet. Coffee time!"

def clean_words(text):
    for mark in ".,!?":
        text = text.replace(mark, "")
    return text.lower().split()

def count_words(words):
    counts = {}
    # TODO: count how many times each word appears
    return counts

def by_count(pair):
    word, count = pair
    return (-count, word)

words = clean_words(text)
counts = count_words(words)
print("Words:", len(words))
print("Unique:", len(counts))
top = sorted(counts.items(), key=by_count)
# TODO: print the three most frequent words as "word: count"

Output

What your program prints appears here.