A word count reports how many words a text contains. In a simple Python file counter, each word is a piece returned by line.split(): count those pieces with len(), then add the result for every line. The count therefore depends on the rule used to identify words. section 8.12 section 8.13.2
Count a file line by line
Initialize word_count = 0, then use `with open('word_count.tst') as infile:` and, for each line, run `word_count += len(line.split())`. The sample file produces 30 words; the same program also reports 4 lines and 186 characters. Reading one line at a time avoids keeping the entire file in memory. section 8.13.2 section 8.12
Choose the counting rule to match the task:
- For a total, add `len(line.split())` across the file. To count only alphabetic pieces, filter the split results with `word.isalpha()` before taking their length. section 8.13.2
- For counts per distinct word, use each word as a dictionary key and increment its value. Sort the dictionary’s items to find the most and least common words; this is a frequency count, not the single total. section 7.8 section 18.6.2
A command-line counter can report word, line, and character counts together, or select the word count with a `-w` option. Reading all lines first permits a compact `sum(len(line.split()) for line in lines)`, but may be unsuitable for a very large file. section 11.5.2 section 8.13.2
