Counting Things

Key Ideas

• Counting a predefined set of values
• Counting a dynamic set of values

👩🏽‍🎨 How many vowels?

Write a program that takes a string and prints out the number of each vowel found in the string.

% python vowel_counts.py 'Hello. How are you?'
{'a': 1, 'e': 2, 'i': 0, 'o': 3, 'u': 1}

vowel_counts.py

👨🏾‍🎨 States

Write a program that polls the user for their homestate.

Print out a count of each state mentioned.

% python state_count.py
State: Utah
State: Idaho
State: New Jersey
State: Oregon
State: Utah
State:
{'Utah': 2, 'Idaho': 1, 'New Jersey': 1, 'Oregon': 1}

state_count.py

🎨 Another way to read a file.

read_file.py

🖌 Punctuation

import string

string.punctuation

'!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'

tokens = []
for word in 'This is a sentence. This is another sentence!?'.split():
    word = word.strip(string.punctuation)
    tokens.append(word)
print(' '.join(tokens))

This is a sentence This is another sentence

🖌 How do you remove punctuation?

no_punct.py

no_punct_v2.py

🧑🏻‍🎨 Many, many words

Write a program that takes a filename and counts the number of each individual word in that file.

Ignore case and punctuation.

Key Ideas

• Counting a predefined set of values
• Counting a dynamic set of values