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How to pass a user defined argument in scrapy spider
...able to access it outside the __init__ method. Python throws a not defined error. BTW, why have you omitted the super call? PS. I'm working with the CrawlSpider class
– Birla
Sep 24 '14 at 10:57
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What is the “Execute Around” idiom?
... a sandwich’s body to
introduce a new defect, which may lead to silent errors. When the body
code is large and before and after are widely separated, such mistakes
can be hard to detect visually.
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Difference between std::result_of and decltype
...a SFINAE-friendly expression, whereas std::result_of could give you a hard error instead of a deduction failure. That has been corrected in C++14: std::result_of is now required to be SFINAE-friendly (thanks to this paper).
So on a conforming C++14 compiler, std::result_of_t<F(Args...)> is st...
How do you do a ‘Pause’ with PowerShell 2.0?
... I made two slight improvements to the latter: added Test-Path to avoid an error if you use Set-StrictMode (you do, don't you?!) and the final Write-Host to add a newline after your keystroke to put the prompt in the right place.
Function Pause ($Message = "Press any key to continue . . . ") {
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What is this Javascript “require”?
... be able to use it obviously. If you need more information please give the error that you are getting.
– Sam Redway
May 15 '16 at 8:38
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Assert a function/method was not called using Mock
...ent call last):
File "<stdin>", line 1, in <module>
AssertionError: a was called and should not have been
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How to loop over files in directory and change path and add suffix to filename
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I believe there's an error in your code. The one line should be base=${name%.txt}, instead of base=${base%.txt}.
– caseklim
May 15 '14 at 1:16
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Create Pandas DataFrame from a string
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I found (by trial&error) that read_fwf takes more of read_csvs arguments than is documented, but it's true that some have no effect.
– gerrit
Jan 20 at 16:12
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How to add property to a class dynamically?
...ux'])
foo = Foo(bar=13, quux=74)
print foo.bar, foo.quux
foo2 = Foo() # error
If you absolutely need to write your own setter, you'll have to do the metaprogramming at the class level; property() doesn't work on instances.
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Curious null-coalescing operator custom implicit conversion behaviour
...ratch for Roslyn; it now does a better job and avoids these sorts of weird errors. For some thoughts on how the optimizer in Roslyn works, see my series of articles which begins here: https://ericlippert.com/2012/12/20/nullable-micro-optimizations-part-one/
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