development tornado.log — Logging support tornado.options — Command-line parsing tornado.stack_context — Exception handling across asynchronous callbacks tornado.testing — Unit testing support for asynchronous curl_httpclient with a properly-configured build of libcurl). In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten to be asynchronous with a callback

can be blocking in some respects and non-blocking in others. In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized httpclient import HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten asynchronously as a native coroutine: AsyncHTTPClient async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for compatibility with older versions of Python, using the tornado

curl_httpclient with a properly-configured build of libcurl). In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized httpclient import HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten to be asynchronous with a callback Documentation Tornado Documentation, Release 4.5.3 def handle_response(response): callback(response.body) http_client.fetch(url, callback=handle_response) And again with a Future instead of a callback: from

Future objects tornado.log — Logging support tornado.options — Command-line parsing tornado.stack_context — Exception handling across asynchronous callbacks tornado.testing — Unit testing support for asynchronous can be blocking in some respects and non-blocking in others. In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten asynchronously as a native coroutine:

can be blocking in some respects and non-blocking in others. In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten asynchronously as a native coroutine: async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for compatibility with older versions of Python, using the tornado

can be blocking in some respects and non-blocking in others. In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten asynchronously as a native coroutine: async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for compatibility with older versions of Python, using the tornado

can be blocking in some respects and non-blocking in others. In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized httpclient import HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten asynchronously as a native coroutine: AsyncHTTPClient async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for compatibility with older versions of Python, using the tornado

can be blocking in some respects and non-blocking in others. In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized httpclient import HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten asynchronously as a native coroutine: AsyncHTTPClient async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for compatibility with older versions of Python, using the tornado

can be blocking in some respects and non-blocking in others. In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized httpclient import HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten asynchronously as a native coroutine: AsyncHTTPClient async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for compatibility with older versions of Python, using the tornado

can be blocking in some respects and non-blocking in others. In the context of Tornado we generally talk about blocking in the context of network I/O, although all kinds of blocking are to be minimized httpclient import HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten asynchronously as a native coroutine: AsyncHTTPClient async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for compatibility with older versions of Python, using the tornado