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In a django model custom save() method, how should you identify a new object?
...ble, but named that way to avoid conflicts, checking self._state.adding is now the preferable way to check.
self.pk is None:
returns True within a new Model object, unless the object has a UUIDField as its primary_key.
The corner case you might have to worry about is whether there are uniquene...
Can you make valid Makefiles without tab characters?
... nothing you can do about it if you are going to use make.
Edit: GNU Make now supports a custom recipe prefix. See this answer.
You are not the first one to dislike this aspect of make. To quote Unix Haters' Handbook:
The problem with Dennis’s Makefile is that when he added the comment line...
Python script to copy text to clipboard [duplicate]
...clipboard_clear()
r.clipboard_append('i can has clipboardz?')
r.update() # now it stays on the clipboard after the window is closed
r.destroy()
(Original author: https://stackoverflow.com/users/449571/atomizer)
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How to resize a custom view programmatically?
...s much better than the other answers because this code doesn't require to know the exact type of the parent ViewGroup.
– Bart Burg
Feb 2 '16 at 9:18
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How do I make an HTTP request in Swift?
...l
//create the session object
let session = URLSession.shared
//now create the URLRequest object using the url object
let request = URLRequest(url: url)
//create dataTask using the session object to send data to the server
let task = session.dataTask(with: request as URLRequest,...
Xcode: Build Failed, but no error messages
...t not Archive. Further googling of your error message should resolve that now that it has been revealed.
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What are rvalues, lvalues, xvalues, glvalues, and prvalues?
... longer say that SomeType&& means the same thing everwhere. You've now made a distinction between named rvalue references and unnamed rvalue references. Well, named rvalue references are lvalues; that was our solution above. So what do we call unnamed rvalue references (the return value from...
How to “set a breakpoint in malloc_error_break to debug”
...inally saw I put a space after the malloc_error_break, I suppressed it and now it works.
A dumb problem but if the solution doesn't work, be sure you haven't put any space before and after the malloc_error_break.
Hope this message will help..
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Completely cancel a rebase
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In the case of a past rebase that you did not properly aborted, you now (Git 2.12, Q1 2017) have git rebase --quit
See commit 9512177 (12 Nov 2016) by Nguyễn Thái Ngọc Duy (pclouds).
(Merged by Junio C Hamano -- gitster -- in commit 06cd5a1, 19 Dec 2016)
rebase: add --quit to cl...
Working with UTF-8 encoding in Python source [duplicate]
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now it gives """UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 1: ordinal not in range(128)"""
– Nullpoet
Jun 9 '11 at 7:36
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