gh-100226: Clarify StreamReader.read behavior (#101807)

1 files changed, 9 insertions, 8 deletions

diff --git a/Lib/asyncio/streams.py b/Lib/asyncio/streams.py
index 7d13e96..bf15f51 100644
--- a/Lib/asyncio/streams.py
+++ b/Lib/asyncio/streams.py
@@ -649,16 +649,17 @@ class StreamReader:
     async def read(self, n=-1):
         """Read up to `n` bytes from the stream.
 
-        If n is not provided, or set to -1, read until EOF and return all read
-        bytes. If the EOF was received and the internal buffer is empty, return
-        an empty bytes object.
+        If `n` is not provided or set to -1,
+        read until EOF, then return all read bytes.
+        If EOF was received and the internal buffer is empty,
+        return an empty bytes object.
 
-        If n is zero, return empty bytes object immediately.
+        If `n` is 0, return an empty bytes object immediately.
 
-        If n is positive, this function try to read `n` bytes, and may return
-        less or equal bytes than requested, but at least one byte. If EOF was
-        received before any byte is read, this function returns empty byte
-        object.
+        If `n` is positive, return at most `n` available bytes
+        as soon as at least 1 byte is available in the internal buffer.
+        If EOF is received before any byte is read, return an empty
+        bytes object.
 
         Returned value is not limited with limit, configured at stream
         creation.