Merge branch 'async-gather' into devel

- closes #1136

tests/py37_asyncio.py

@@ -10,6 +10,7 @@
 tqdm = partial(tqdm_asyncio, miniters=0, mininterval=0)
 trange = partial(tarange, miniters=0, mininterval=0)
 as_completed = partial(tqdm_asyncio.as_completed, miniters=0, mininterval=0)
+gather = partial(tqdm_asyncio.gather, miniters=0, mininterval=0)
 
 
 def count(start=0, step=1):
@@ -112,3 +113,16 @@ async def test_as_completed(capsys, tol):
         except AssertionError:
             if retry == 2:
                 raise
+
+
+async def double(i):
+    return i * 2
+
+
+@mark.asyncio
+async def test_gather(capsys):
+    """Test asyncio gather"""
+    res = await gather(list(map(double, range(30))))
+    _, err = capsys.readouterr()
+    assert '30/30' in err
+    assert res == list(range(0, 30 * 2, 2))

tqdm/asyncio.py

@@ -17,7 +17,7 @@
 
 class tqdm_asyncio(std_tqdm):
     """
-    Asynchronous-friendly version of tqdm (Python 3.5+).
+    Asynchronous-friendly version of tqdm (Python 3.6+).
     """
     def __init__(self, iterable=None, *args, **kwargs):
         super(tqdm_asyncio, self).__init__(iterable, *args, **kwargs)
@@ -63,6 +63,19 @@ def as_completed(cls, fs, *, loop=None, timeout=None, total=None, **tqdm_kwargs)
         yield from cls(asyncio.as_completed(fs, loop=loop, timeout=timeout),
                        total=total, **tqdm_kwargs)
 
+    @classmethod
+    async def gather(cls, fs, *, loop=None, timeout=None, total=None, **tqdm_kwargs):
+        """
+        Wrapper for `asyncio.gather`.
+        """
+        async def wrap_awaitable(i, f):
+            return i, await f
+
+        ifs = [wrap_awaitable(i, f) for i, f in enumerate(fs)]
+        res = [await f for f in cls.as_completed(ifs, loop=loop, timeout=timeout,
+                                                 total=total, **tqdm_kwargs)]
+        return [i for _, i in sorted(res)]
+
 
 def tarange(*args, **kwargs):
     """

tqdm/auto.py

@@ -4,7 +4,7 @@
 Method resolution order:
 
 - `tqdm.autonotebook` without import warnings
-- `tqdm.asyncio` on Python3.5+
+- `tqdm.asyncio` on Python3.6+
 - `tqdm.std` base class
 
 Usage:
@@ -22,10 +22,10 @@
     from .autonotebook import tqdm as notebook_tqdm
     from .autonotebook import trange as notebook_trange
 
-if sys.version_info[:2] < (3, 5):
+if sys.version_info[:2] < (3, 6):
     tqdm = notebook_tqdm
     trange = notebook_trange
-else:  # Python3.5+
+else:  # Python3.6+
     from .asyncio import tqdm as asyncio_tqdm
     from .std import tqdm as std_tqdm