Python - Me ayuden a comprender este codigo.

   
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Me ayuden a comprender este codigo.

Publicado por Alejandra (1 intervención) el 01/12/2017 14:57:29
Hola quisiera que alguien me ayude a comprender cual es el input de este codigo y que hace.

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''' Module to generate max, total and docs json files. '''
import json
 
import argparse
 
from os import listdir
from os.path import isfile, join
 
import math
import sys
 
TITLE_FIELD = 'title'
WORDS_FIELD = 'words'
 
def gen_jsons(files):
    ''' Generate max, total and docs files from FILES files array. '''
    max_map = dict()
    total_map = dict()
    docs_map = dict()
 
    docs_count = 0
 
    for filename in files:
        f = open(filename, 'r')
 
        # each document
        docs = f.readlines()
        doc = docs[0:3]
        i = 3
        while i <= len(docs):
            content = doc[2]
            words = content.split(' ')[:-1] # omit \n char
 
            doc_id = doc[0][:-1] # omit \n char
            docs_map[doc_id] = dict() # add doc entry
            docs_map[doc_id][TITLE_FIELD] = doc[1][:-1] # add title entry, omit \n char
            docs_map[doc_id][WORDS_FIELD] = dict() # add words entry
 
            doc_words = docs_map[doc_id][WORDS_FIELD]
 
            for word in words:
                doc_words[word] = doc_words.get(word, 0) + 1
            for word in doc_words:
                doc_words[word] = doc_words[word] / float(len(doc_words))
 
                total_map[word] = total_map.get(word, 0) + 1 # add to total docs with  word
 
            doc = docs[i:i + 3]
            i += 3
 
            docs_count += 1
        f.close()
 
    for doc in docs_map:
        words = docs_map[doc][WORDS_FIELD]
        for word in words:
            words[word] = words[word] * math.log(docs_count / total_map[word])
 
            max_map[word] = words[word] if words[word] > max_map.get(word, -sys.maxint) else\
                max_map[word]
    for doc in docs_map:
        words = docs_map[doc][WORDS_FIELD]
        norm = 0.0
        for word in words:
            norm += math.pow(words[word], 2)
        docs_map[doc]['norm'] = math.pow(norm, 0.5)
 
    docs_str = json.dumps(docs_map)
    total_str = json.dumps(total_map)
    max_str = json.dumps(max_map)
 
    docs_file = open('docs.json', 'w')
    total_file = open('total.json', 'w')
    max_file = open('max.json', 'w')
 
    docs_file.write(docs_str)
    total_file.write(total_str)
    max_file.write(max_str)
 
    docs_file.close()
    total_file.close()
    max_file.close()
 
def main():
    ''' Main function. '''
    parser = argparse.ArgumentParser(description='Generate json files.')
    parser.add_argument('paths', metavar='path', type=str, nargs='+',
                        help='a path to directories or files')
    parser.add_argument('--dir', '-d', dest='directories', action='store_const',
                        const=True, default=False,
                        help='paths are directories (default: paths are files)')
 
    args = parser.parse_args()
 
    files = []
    if args.directories:
        # directories
        for path in args.paths:
            files = [join(path, f) for f in listdir(path) if isfile(join(path, f))]
    else:
        # files
        for path in args.paths:
            if isfile(path):
                files.append(path)
 
    gen_jsons(files)
 
if __name__ == "__main__":
    main()
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