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# adapted from Alex Martelli's example in "Re-learning Python"

# http://www.aleax.it/Python/accu04_Relearn_Python_alex.pdf

# (slide 41) Ex: lines-by-word file index

# tag::INDEX[]

"""Build an index mapping word -> list of occurrences"""

import re

import sys

WORD_RE = re.compile(r'\w+')

index = {}

with open(sys.argv[1], encoding='utf-8') as fp:

for line_no, line in enumerate(fp, 1):

for match in WORD_RE.finditer(line):

word = match.group()

column_no = match.start() + 1

location = (line_no, column_no)

index.setdefault(word, []).append(location) # <1>

# display in alphabetical order

for word in sorted(index, key=str.upper):

print(word, index[word])

# end::INDEX[]