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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
...
How to import other Python files?
...ky pie people can't go up and have the sky pie!
SKYCAKE!
If you get an error here: ModuleNotFoundError: No module named 'user' then it means you're using python3, startuphooks are disabled there by default.
Credit for this jist goes to: https://github.com/docwhat/homedir-examples/blob/master/py...
Select by partial string from a pandas DataFrame
...ed solution above:
df[df["A"].str.contains("Hello|Britain")]
and got an error:
ValueError: cannot mask with array containing NA / NaN values
you can transform NA values into False, like this:
df[df["A"].str.contains("Hello|Britain", na=False)]
...
Can you help me understand this? “Common REST Mistakes: Sessions are irrelevant”
...ct it's result? If the caller is not authorized, they get a Not Authorized error. Same thing with a session token. I really don't see the difference?
– Rob
Feb 13 '09 at 16:33
3
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Getting image dimensions without reading the entire file
...imensions
{
public static class ImageHelper
{
const string errorMessage = "Could not recognize image format.";
private static Dictionary<byte[], Func<BinaryReader, Size>> imageFormatDecoders = new Dictionary<byte[], Func<BinaryReader, Size>>()
...
T-SQL stored procedure that accepts multiple Id values
...s security implications.
Passing the List as Many Parameters. Tedious and error prone, but simple.
Really Slow Methods. Methods that uses charindex, patindex or LIKE.
I really can't recommend enough to read the article to learn about the tradeoffs among all these options.
...
When to use single quotes, double quotes, and backticks in MySQL
...ifiers just like `
The following query will produce different results (or errors) depending on SQL mode:
SELECT "column" FROM table WHERE foo = "bar"
ANSI_QUOTES disabled
The query will select the string literal "column" where column foo is equal to string "bar"
ANSI_QUOTES enabled
The query will ...
Which Boost features overlap with C++11?
...see the list below
gamma function (tgamma), log gamma function (lgamma)
error functions (erf, erfc)
log1p, expm1
cbrt, hypot
acosh, asinh, atanh
TR1 (they are marked in the documentation if those are TR1 libraries)
Array → std::array
Bind → std::bind
Enable If → std::enable_if
Function...
Does async(launch::async) in C++11 make thread pools obsolete for avoiding expensive thread creation
...that forcing you to wait for a return before destruction is necessarily an error. I don't know that you should be using the async call to create 'daemon' threads that aren't expected to return. And if they are expected to return, it's not OK to be ignoring exceptions.
Question 3:
Personally, I lik...
What is 'Currying'?
...ot of time on Haskell, and that was all a few weeks ago. So it was an easy error to make.
– Eric M
Aug 31 '09 at 17:03
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