[issue20058] IDLE's shell returns a multiple-line string to input() or readline() when multiple lines of text are pasted by the user

2013-12-25 Thread Serhiy Storchaka 

Changes by Serhiy Storchaka storch...@gmail.com:


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assignee:  - serhiy.storchaka

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[issue20058] IDLE's shell returns a multiple-line string to input() or readline() when multiple lines of text are pasted by the user

2013-12-25 Thread Roundup Robot 

Roundup Robot added the comment:

New changeset 526dcd51e425 by Serhiy Storchaka in branch '2.7':
Issue #20058: sys.stdin.readline() in IDLE now always returns only one line.
http://hg.python.org/cpython/rev/526dcd51e425

New changeset 8f75d8ddc95b by Serhiy Storchaka in branch '3.3':
Issue #20058: sys.stdin.readline() in IDLE now always returns only one line.
http://hg.python.org/cpython/rev/8f75d8ddc95b

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nosy: +python-dev

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[issue20058] IDLE's shell returns a multiple-line string to input() or readline() when multiple lines of text are pasted by the user

2013-12-25 Thread Roundup Robot 

Roundup Robot added the comment:

New changeset 2a4c083f8f6b by Serhiy Storchaka in branch 'default':
Issue #20058: sys.stdin.readline() in IDLE now always returns only one line.
http://hg.python.org/cpython/rev/2a4c083f8f6b

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[issue20058] IDLE's shell returns a multiple-line string to input() or readline() when multiple lines of text are pasted by the user

2013-12-25 Thread Serhiy Storchaka 

Serhiy Storchaka added the comment:

Fixed. Thank you Steven for your report.

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resolution:  - fixed
stage: patch review - committed/rejected
status: open - closed

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[issue20058] IDLE's shell returns a multiple-line string to input() or readline() when multiple lines of text are pasted by the user

2013-12-23 Thread Steven Barker 

New submission from Steven Barker:

Pasting multiple lines of input and then pressing Enter when IDLE is waiting to 
read a single line (such as when input() or sys.stdin.readline() have been 
called) will result is a multi-line string being given as the input, rather 
than a single line.

This may be most easily understood by looking at an example. Run this code in 
IDLE (either by typing it in the shell, or from a file with F5):

s = X
while s:
s = input()
print(repr(s))

First, try typing in several lines. Each will be printed separately, with no 
newlines inside the strings (since input() strips a trailing newline).

foo
'foo'
bar
'bar'
baz
'baz'

Next, copy several lines of text from somewhere. It doesn't matter what the 
lines' contents are. Here I grabbed a list of Python version numbers, as I was 
on the download page after grabbing 3.4.0b1 for testing this bug:

3.1.5
3.0.1
2.7.6
2.6.9
2.5.6
2.4.6
2.3.7
2.2.3 all the preceding lines were pasted in one go, followed by enter 
pressed here
'3.1.5\n3.0.1\n2.7.6\n2.6.9\n2.5.6\n2.4.6\n2.3.7\n2.2.3'

This behavior is different than what the Python interpreter does in a regular 
console shell. When running in cmd.exe on Windows, Python treats a multi-line 
paste just like typed input:

3.1.5
'3.1.5'
3.0.1
'3.0.1'
2.7.6
'2.7.6'
2.6.9
'2.6.9'
2.5.6
'2.5.6'
2.4.6
'2.4.6'
2.3.7
'2.3.7'
2.2.3 enter typed here
'2.2.3'

I expect the same behavior will be common in other kinds of terminals on other 
platforms.

This issue makes testing certain kinds of programs very frustrating. If your 
program needs to read certain text from STDIN, and you want to paste that text 
in quickly, you need to update your code with special logic just for use in 
IDLE's console. As an example of the kind of pain you may experience, try 
copying and pasting a block of text with a blank line into the input loop 
above. On a regular console session it will exit the loop after the blank line. 
In IDLE, it will keep running.

I've traced the source of this issue through IDLE's sys.stdin file object and 
an RPC call, and found it probably is located in the 
idlelib.PyShell.PyShell.readline method (or the surrounding code). This grabs a 
string from the Text object in the shell window and returns it to the Python 
code running in the subprocess.

Probably it should have some extra steps added to check if it got multiple 
lines. If so, it should split the string on newlines and return just one line 
of text for each readline call. I'm not sure exactly what should be done with 
the rest of the lines, but perhaps they could be queued up (or somehow put 
back by moving the markers in the Text object) so later lines would be grabbed 
by later input requests.

Or alternatively, maybe the event where the multi-line paste arrives should be 
handled differently, as several single-line input events, rather than a single 
multiple-line one.

--
components: IDLE
messages: 206879
nosy: Steven.Barker
priority: normal
severity: normal
status: open
title: IDLE's shell returns a multiple-line string to input() or readline() 
when multiple lines of text are pasted by the user
type: behavior
versions: Python 2.7, Python 3.3, Python 3.4

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[issue20058] IDLE's shell returns a multiple-line string to input() or readline() when multiple lines of text are pasted by the user

2013-12-23 Thread Serhiy Storchaka 

Changes by Serhiy Storchaka storch...@gmail.com:


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nosy: +kbk, roger.serwy, serhiy.storchaka, terry.reedy

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[issue20058] IDLE's shell returns a multiple-line string to input() or readline() when multiple lines of text are pasted by the user

2013-12-23 Thread Serhiy Storchaka 

Serhiy Storchaka added the comment:

Here is simple patch.

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keywords: +patch
stage:  - patch review
Added file: http://bugs.python.org/file33259/idle_readline.patch

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