API to access Portuguese Literary Corpus
Project description
litcorpt
LITerary CORpus for PorTuguese is a API to access a literary corpus in portuguese language.
The API provides access to the corpus without all the fuzz to download and write a loader for different types of data sources. It is exposed as a simple document database.
How to install.
Simply:
pip install litcorpt
Getting started
After installation in you Python just
import litcorpt
corpus = litcorpt.load_corpus(verbose=True)
print(f'There are {len(corpus)} documents in corpus')
It will load the whole corpus. When running by the first time. It will download from internet, process and build the whole dataset.
The download size is around 115MB and is automaticly handled by the library. It is downloaded just at first time you load it. After the first time it will load from local disk. The time to load data locally takes around 34 ms, in my own computer (the mileage may vary).
Basic Usage
Most of time you want just to retrieve the whole corpus as a list of documents. You can just do that with this oneliner.
documents = [ content for document in corpus.all() for content in document['contents'] ]
This operation just append to a list all contents for all documents. Since a document may have more than one content.
Advanced usage
Besides the fetchall usage, many custom queries can be done. Is possible to search by matches, regexes, fields.
All documents of an author (Eça de Queirós)
We are ignoring documents where Queirós is an editor.
As a regular for
loop
q = litcorpt.Query()
search = corpus.search(q.authors.any((q.lastname == 'Queirós') &
(q.firstname == 'Eça de')))
titles = []
for document in search:
titles.append(document['title'])
As a list comprehension shorter but harder to read.
q = litcorpt.Query()
titles = [ document['title'] for document in corpus.search(q.authors.any((q.lastname == 'Queirós') & (q.firstname == 'Eça de')))]
Building a corpus with Eça de Queirós
q = litcorpt.Query()
search = corpus.search(q.authors.any((q.lastname == 'Queirós') &
(q.firstname == 'Eça de')))
queiros_corpus = []
for documents in search:
for document in documents['contents']:
print(type(document))
queiros_corpus.append(document)
Building a bibliography
Here we handle the case where there is no author.
bibliography = []
for document in corpus.all():
authors = []
for author in document.get('authors', [{'lastname': 'Anonymous'}]):
authors.append(', '.join(filter(None, list(author.values())[:2])))
bibliography.append(f'{" and ".join(authors)}. {document["title"]}.')
Count documents by Author Surname
Here we use Python's Counter to count the surnames and using a dict
comprehension to filter the authors that occurs more than 5 times. You still can
access the whole counting the lastnames
variable
As a list comprehension
q = litcorpt.Query()
from collections import Counter
lastnames = Counter([ author['lastname'] for document in corpus.search(q.authors.exists()) for author in document['authors'] ])
most_common_surnames = {lastname: count for lastname, count in lastnames.items() if count >= 5}
Unrolling the comprehension
q = litcorpt.Query()
from collections import Counter
lastnames = []
for document in corpus.search(q.authors.exists()):
for author in document['authors']:
lastnames.append(author['lastname'])
lastnames = Counter(lastnames)
most_common_surnames = {}
for lastname, count in lastnames.items():
if count >= 5:
most_common_surnames[lastname] = count
Extra: Sorting by decreasing frequency, then alphabeticaly.
sorted(most_common_surnames.items(), key=lambda item: (-item[1], item[0]))
Display all Subjects
First we group all subjects
q = litcorpt.Query()
subjects = []
for document in corpus.search(q.subject.exists()):
subjects.extend(document['subject'])
Then we can count, and sort by descending frequency (Python 3.6> dicts are ordered by default).
from collections import Counter
subject_frequency = Counter(subjects)
subject_frequency = dict(sorted(subject_frequency.items(), key=lambda item: -item[1]))
And also group the unique items for reference.
subject_list = list(subject_frequency.keys())
Building a corpus given a list of Subjects
First we pick a list of subjects
subjects = [ 'portuguese drama',
'france',
'drama',
'women',
'<INVALID SUBJECT>' ]
Then we proceed with search and corpus Building
q = litcorpt.Query()
search = corpus.search(q.subject.any(subjects))
drama_corpus = [ document for documents in search for document in documents['contents'] ]
If we want we can easily list the titles in our new drama_corpus
titles = [ document['title'] for document in search ]
Of course we can do the same by any of the fields in document.
The structure of a document.
The corpus database is a list of documents. A document is often related with a literary document (book, text, play, etc) and contains the following fields:
'title': (str) The document title 'authors': (list) A list of authors. Each author contains: 'lastname' (str) The author last name, 'firstname'(str) The author first name, 'life': (str) The author life. 'editors': (list) A list of editors. Same fields as authors. 'language': (list) A list of languages in document (often portuguese) 'subject': (list) A list of topics covered in the document 'category': (list) A list of genres, often just a single entry. 'contents': (list) The document contents. Often just one entry. 'note': (str) Notes and observations about the document.
There are also some less used keys as
'datasource': (str) The data source 'sourcekey': (str) The data source key index. 'loc': (str) The Library of Congress catalog string 'href': (str) The url path inside the data source (used to fetch the metadata) 'files': (list) A list of files related to document in data source.
These keys can be changed, added or removed in future. Everything is mutable.
Customizing
By default, the corpus is stored at
${HOME}/litcorpt_data
If you wish to put in a different place, just set the LITCORPUSPT_DATAPATH
environment variable in your system configuration. For example for bash, add
this to your ~/.bashrc
export LITCORPUSPT_DATAPATH="/whatever/place/you/want"
Then call your programs using litcorpt
or your ipython
session
TODO
- Make data from dominiopublico.gov.br available into API
- Maybe build some custom functions to handle the most common filter use cases.
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