Martin Panter added the comment:

In revision 83450939b106, Yury added some documentation for readuntil(). I am 
not familiar with this StreamReader class, but maybe Mark or someone else can 
check if the remaining changes in his patch are still useful.

I can suggest some spelling and wording fixes however. Bits in square brackets 
are my changes.

## read(n=-1):

If *n* is zero, return [an] empty ``bytes`` object [immediately (single L)].

If *n* is positive, this function [tries] to read *n* bytes, [but may return 
less]. If EOF was received before any byte is read, this function returns [an] 
empty [bytes] object[, otherwise it returns at least one byte].

[The] returned value is not limited [by] [*limit* (add asterisks)], . . .

If [the] stream was paused, . . .

## readline():

Read [] from the stream until [a] newline (``b'\n'``) is found.

On success, return [the line, which] ends with [a] newline. If only [a] partial 
line can be read due to EOF, return [an] incomplete line without terminating 
newline. When EOF was reached [and] no bytes [were] read, [an] empty ``bytes`` 
object is returned.

If [*limit* (add asterisks)] is reached, ValueError will be raised. In that 
case, if [a] newline was found, [the] complete line including newline will be 
removed from [the] internal buffer. [Otherwise, the] internal buffer will be 
cleared. [*Limit* (add asterisks)] is compared against [the length] of the 
line[, not counting the] newline.

If [the] stream was paused, . . .

## readexactly(n):

If *n* is zero, return [an] empty bytes object.

[The] returned value is not limited by [*limit* (add asterisks)], . . .

If [the] stream was paused, . . .

## readuntil(separator=b'\n'):

Read [] from the stream until *separator* is found.

On success, [the] chunk [of data] and its separator will be removed from [the] 
internal buffer (i.e. consumed). [The] returned chunk will include [the] 
separator at the end.

[The] configured stream limit is used to [limit the] result. [*Limit* (add 
asterisks)] means [the maximum] length of [the] chunk . . .

If EOF occurs and [a] complete separator [is] still not found, 
:exc:`IncompleteReadError`(<partial data>, None) will be raised and [the] 
internal buffer becomes empty. . . .

If [the] chunk cannot be read due to [the] limit, :exc:`LimitOverrunError` will 
be raised and data will be left in [the] internal buffer, . . .

If [the] stream was paused, . . .

----------
assignee:  -> docs@python
components: +Documentation
nosy: +docs@python, martin.panter
stage:  -> patch review

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26050>
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