[issue35366] Monkey Patching class derived from ctypes.Union doesn't work

[Vijay]

New submission from Vijay :

I am trying to "monkey patch" a class derived from Python ctypes "Union", but I 
am unable to do so - getting weird errors and sometimes seg-faults. The same 
thing works quite well when deriving from ctypes "Structure".

I have narrowed this to down to the simplest possible test case which I am 
posting below. I am using Python 3.6.4. I am wondering if I am doing something 
wrong (or is there a problem with the ctypes "Union" implementation?). 

The example python code is attached with this issue.

Please see the output below (for the attached code in Python 3.6.4).

Using Structure:

Print Type #1: [ 10, 20 ]
Original : 
Patched : 
Patched (dict) : 
Print Type #2: ( 10, 20 )
Using Union:

Print Type #1: [ 20, 20 ]
Original : 
Patched : 
Patched (dict) : 
Traceback (most recent call last):
  File "ctypes_bug.py", line 54, in 
print(a)
TypeError: 'managedbuffer' object is not callable

Clearly, I am able to "patch" __str__ when the corresponding Python object was 
derived from "Structure", but I am unable to "patch" __str__ when the 
corresponding Python object was derived from "Union".

Interestingly, MyUnion.__dict__[__str__] and MyUnion.__str__ shows different 
results - which is weird as well.

Is there something I am doing wrong here, or is there an issue with 
ctypes.Union? I highly appreciate any help or insight!

--
components: ctypes
files: ctypes_bug.py
messages: 330817
nosy: rvijayc
priority: normal
severity: normal
status: open
title: Monkey Patching class derived from ctypes.Union doesn't work
type: behavior
versions: Python 3.6
Added file: https://bugs.python.org/file47961/ctypes_bug.py

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[issue35366] Monkey Patching class derived from ctypes.Union doesn't work

[Vijay]

Vijay  added the comment:

Wanted to post a possible workaround until this is fixed. One can simply wrap a 
union anonymously inside a structure. Like so:

struct my_struct_s {
  union my_union_u {

  };
};

This temporarily solved the problem in my case.

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[issue34553] Python Crashes when trying to access any date related fields in MailItem

[Vijay]

New submission from Vijay :

MailItem.SentOn or MailItem.ReceivedTime, Python crashes with windows showing 
"Python has stopped working" dialog window. What can be the cause of this issue?

import win32com.client
import os
import datetime
from datetime import timedelta
outlook = win32com.client.Dispatch("Outlook.Application").GetNamespace("MAPI")
inbox = outlook.GetDefaultFolder(6)
messages=inbox.Items
message = messages.GetLast()

print(type(message))

t = message.ReceivedTime    crashes when the script is reached this line.

Attached the screenshot for your reference.

--
files: python crash.PNG
messages: 324406
nosy: vijay
priority: normal
severity: normal
status: open
title: Python Crashes when trying to access any date related fields in MailItem
type: crash
versions: Python 3.7
Added file: https://bugs.python.org/file47774/python crash.PNG

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[issue34553] Python Crashes when trying to access any date related fields in MailItem

[Vijay]

Vijay  added the comment:

i have already added the script. try to run in the python3.7. python is getting 
crashed.

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[issue34553] Python Crashes when trying to access any date related fields in MailItem

[Vijay]

Vijay  added the comment:

Thanks for the inputs. i will check with pywin32 team.
is there any pywin32 link to raise the case. please share if you know.

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[issue34553] Python Crashes when trying to access any date related fields in MailItem

[Vijay]

Vijay  added the comment:

can someone please clarify, is it a pywin32 issue or python3.7 issue?.

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[issue5712] tkinter - askopenfilenames returns string instead of tuple in windows 2.6.1 release

[vijay]

vijay  added the comment:

Two issues related with the workaround suggested by nosklo.

1. Splitting the filepaths isnt simple, as there may be blank spaces etc.
2. We have different versions of Python installed in our Lab machines, some 
have 2.5 and others got 2.6. If I run the code using the version2.6 workaround 
on a machine with version2.5, obviously it gives an error!!

Any updates on a fix? This bug is really giving me a hard time.

--
nosy: +luckycusp

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[issue5712] tkinter - askopenfilenames returns string instead of tuple in windows 2.6.1 release

[vijay]

vijay  added the comment:

Update!! I found a very good workaround for this and it works very nicely, with 
both 2.5 and 2.6 versions. 

Below is the segment from my code:-

from Tkinter import *
import tkFileDialog

master = Tk()
master.withdraw() #hiding tkinter window

Inputfiles = tkFileDialog.askopenfilenames(title="Select the source input 
file(s)", filetypes=[("mpf file",".mpf"),("All files",".*")])

#Heres the TRICK!
InputfilesList =  master.tk.splitlist(Inputfiles)

--

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[issue5712] tkinter - askopenfilenames returns string instead of tuple in windows 2.6.1 release

[vijay]

vijay  added the comment:

Hi Clovis

Ok, I did not check if your split string function check for spaces or not, 
sorry for that. 

In my first post I mentioned this:-

"2. We have different versions of Python installed in our Lab machines, some 
have 2.5 and others got 2.6. If I run the code using the version2.6 workaround 
on a machine with version2.5, obviously it gives an error!!"

Infact I started out using your split string function but it was on a machine 
with Python2.6. It worked fine. Then I ran the same code on a machine with 
version Python2.5 and it threw an error when I tried calling your function, 
because the argument I passed to your function was already a tuple and not a 
string!! (I hope I could explain without confusing)

I would prefer my code to have some level of downward compatibility (to be able 
to run on Python of lower versions). Thats the reason I prefer to use the 
'splitlist' method from Tkinter, as I dont need to change my code for different 
Python versions.

Best Regards
Vijay

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[issue14322] More test coverage for hmac

[Vijay Majagaonkar]

Changes by Vijay Majagaonkar :


--
nosy: +Vijay.Majagaonkar

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[issue26543] [EASY] imaplib noop Debug: bytes vs Unicode bug in debug mode

[Govind Vijay]

Change by Govind Vijay :


--
versions:  -Python 3.6

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[issue16512] imghdr doesn't recognize variant jpeg formats

[Govind Vijay]

Change by Govind Vijay :


--
pull_requests: +7860
stage: test needed -> patch review

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[issue20922] Global variables

[VIJAY KANSAL]

New submission from VIJAY KANSAL:

Inside functions:
1. Python allows access to global variables.
2. Python allows creation of local variable with the same name as that of of 
some of the global variable.

Keeping the above two statements in mind, I believe that Python must allow 
following sequential statements in a function:
1. Accessing global variable
2. Creating local variable with the same name as that of some of the global 
variable name.

But, it seems that the above is not allowed.
The below code has the following output:

Printing:  12
Throwing Error: 
Traceback (most recent call last):
  File "./bug.py", line 14, in 
func2()
  File "./bug.py", line 9, in func2
print 'Throwing Error: ', var
UnboundLocalError: local variable 'var' referenced before assignment




CODE:

var = 12

def func1():
print 'Printing: ', var 

def func2():
print 'Throwing Error: ', var 
var = 10
print 'Unreachable Code: ', var 

func1()
func2()

--
messages: 213520
nosy: vijay_kansal
priority: normal
severity: normal
status: open
title: Global variables
type: behavior
versions: Python 2.7

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[issue20922] Global variables and Local Variables with same name

[VIJAY KANSAL]

Changes by VIJAY KANSAL :


--
title: Global variables -> Global variables and Local Variables with same name

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