How often do words appear in a text?

Assignment

A word in a text is defined as the longest sequence of letters, where every character that is not a letter is considered a word boundary. Your task:

• Write a function word_split that takes the location of a text file (str). The function must return a list containing the sequence of words from the given text file.

• Write a function word_count that takes the location of a text file (str). The function must return a dictionary (dict) that maps each word in the given text file onto the number of occurrences of the word in the given text file. The function may not make a distinction between uppercase and lowercase letters, and must lowercase words as keys in the dictionary it returns.

Note

This is the exact same assignment as the previous assignment, but now you have to make sure to process the text line by line. This is something that you would have to do if you had to process a very long text.

Example

In the following interactive session we assume the text file data.txt¹ to be located in the current directory.

>>> worden_split('data.txt')
['How', 'much', 'wood', 'would', 'a', 'woodchuck', 'chuck', 'If', 'a', 'woodchuck', 'could', 'chuck', 'wood', 'He', 'would', 'chuck', 'he', 'would', 'as', 'much', 'as', 'he', 'could', 'And', 'chuck', 'as', 'much', 'as', 'a', 'woodchuck', 'would', 'If', 'a', 'woodchuck', 'could', 'chuck', 'wood']
>>> word_count('data.txt')
{'how': 1, 'much': 3, 'wood': 3, 'would': 4, 'a': 4, 'woodchuck': 4, 'chuck': 5, 'if': 2, 'could': 3, 'he': 3, 'as': 4, 'and': 1}