Merge pull request #4900 from elacuesta/deprecate_utils_py36

Deprecate scrapy.utils.py36 module

scrapy/utils/asyncgen.py

+async def collect_asyncgen(result):
+    results = []
+    async for x in result:
+        results.append(x)
+    return results

scrapy/utils/py36.py

-"""
-Helpers using Python 3.6+ syntax (ignore SyntaxError on import).
-"""
+import warnings
 
+from scrapy.exceptions import ScrapyDeprecationWarning
+from scrapy.utils.asyncgen import collect_asyncgen  # noqa: F401
 
-async def collect_asyncgen(result):
-    results = []
-    async for x in result:
-        results.append(x)
-    return results
+
+warnings.warn(
+    "Module `scrapy.utils.py36` is deprecated, please import from `scrapy.utils.asyncgen` instead.",
+    category=ScrapyDeprecationWarning,
+    stacklevel=2,
+)

scrapy/utils/spider.py

@@ -4,17 +4,14 @@ import logging
 from scrapy.spiders import Spider
 from scrapy.utils.defer import deferred_from_coro
 from scrapy.utils.misc import arg_to_iter
-try:
-    from scrapy.utils.py36 import collect_asyncgen
-except SyntaxError:
-    collect_asyncgen = None
+from scrapy.utils.asyncgen import collect_asyncgen
 
 
 logger = logging.getLogger(__name__)
 
 
 def iterate_spider_output(result):
-    if collect_asyncgen and hasattr(inspect, 'isasyncgen') and inspect.isasyncgen(result):
+    if inspect.isasyncgen(result):
         d = deferred_from_coro(collect_asyncgen(result))
         d.addCallback(iterate_spider_output)
         return d

setup.cfg

@@ -55,9 +55,6 @@ ignore_errors = True
 [mypy-scrapy.utils.response]
 ignore_errors = True
 
-[mypy-scrapy.utils.spider]
-ignore_errors = True
-
 [mypy-scrapy.utils.trackref]
 ignore_errors = True