Потоки и процессы питона
Добавлено: Вс, 22 января 2017, 20:59:09
Threading
http://www.tutorialspoint.com/python3/python_multithreading.htm
Код: Выделить всё
import urllib2
from multiprocessing.dummy import Pool as ThreadPool
urls = ['http://www.python.org', ]
# Make the Pool of workers
pool = ThreadPool(4)
# Open the urls in their own threads
# and return the results
results = pool.map(urllib2.urlopen, urls)
#close the pool and wait for the work to finish
pool.close()
pool.join() Код: Выделить всё
template<T> using is_const_reference = std::is_const<std::remove_reference_t<T>>;Код: Выделить всё
import sqlite3
foobar_uri = 'file:foobar_database?mode=memory&cache=shared'
not_really_foobar_uri = 'file:not_really_foobar?mode=memory&cache=shared'
# connect to databases in no particular order
db2 = sqlite3.connect(foobar_uri, uri=True)
db_lol = sqlite3.connect(not_really_foobar_uri, uri=True)
db1 = sqlite3.connect(foobar_uri, uri=True)
# create cursor as db2
cur2 = db2.cursor()
# create table as db2
db2.execute('CREATE TABLE foo (NUMBER bar)')
# insert values as db1
db1.execute('INSERT INTO foo VALUES (42)')
db1.commit()
# and fetch them from db2 through cur2
cur2.execute('SELECT * FROM foo')
print(cur2.fetchone()[0]) # 42
# test that db_lol is not shared with db1 and db2
try:
db_lol.cursor().execute('SELECT * FROM foo')
except sqlite3.OperationalError as exc:
print(exc) # just as expected