IDLE: Freezes and/or crash on SyntaxWarning... is used prior to global declaration

[marco]

BPO	13654
Nosy	@ned-deily, @serwy
Superseder	bpo-12438: IDLE problem displaying warning message
Files	issue_global_crash.py

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2011-12-23.07:04:20.294>
created_at = <Date 2011-12-23.01:23:32.220>
labels = ['expert-IDLE']
title = 'IDLE: Freezes and/or crash on SyntaxWarning... is used prior to global declaration'
updated_at = <Date 2011-12-23.07:04:20.271>
user = 'https://bugs.python.org/marco'

bugs.python.org fields:

activity = <Date 2011-12-23.07:04:20.271>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2011-12-23.07:04:20.294>
closer = 'ned.deily'
components = ['IDLE']
creation = <Date 2011-12-23.01:23:32.220>
creator = 'marco'
dependencies = []
files = ['24082']
hgrepos = []
issue_num = 13654
keywords = []
message_count = 3.0
messages = ['150125', '150132', '150134']
nosy_count = 3.0
nosy_names = ['ned.deily', 'roger.serwy', 'marco']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '12438'
type = None
url = 'https://bugs.python.org/issue13654'
versions = ['Python 2.7']

[marco]

Writing the following code in the IDLE module/scriptneditor and then running it (F5) will momentarily freeze without giving the expected warning message ("SyntaxWarning: name 'GLOBAL1' is used prior to global declaration") and it will crash all IDLE windows instances if ran multiple times after it.

------------------
start code snippet:
------------------

GLOBAL1=10

def test_chnge_val_1(a=1):
##    global GLOBAL1
    b=GLOBAL1
    print GLOBAL1, b
    global GLOBAL1
    GLOBAL1 += a
    b= 100
    print GLOBAL1, b
 

if __name__ == '__main__':
    test_chnge_val_1()

---

end code snippet:
----------------

The desired behavior is to not crash but run the code with output and shoot the expected message to STOUT/shell console like regular python shell would.

-----
Notes:
-----
issue_global_crash.py code-file attached.

[serwy]

I ran IDLE with a console and then ran your script against the latest release. The error message is due to a bug in idle_showwarning.

Your script works with the development version, however. This is a duplicate of bpo-12438 which was fixed in e9c406a53972, but not yet released.

[ned-deily]

The fix has been released in Python 3.2.2. It will be in Python 2.7.3 when released.