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How to pass a user defined argument in scrapy spider
I am trying to pass a user defined argument to a scrapy's spider. Can anyone suggest on how to do that?
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Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell
I have taken Problem #12 from Project Euler as a programming exercise and to compare my (surely not optimal) implementations in C, Python, Erlang and Haskell. In order to get some higher execution times, I search for the first triangle number with more than 1000 divisors instead of 500 as stated...
Fastest check if row exists in PostgreSQL
I have a bunch of rows that I need to insert into table, but these inserts are always done in batches. So I want to check if a single row from the batch exists in the table because then I know they all were inserted.
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Specifying an Index (Non-Unique Key) Using JPA
How do you define a field, eg email as having an index using JPA annotations. We need a non-unique key on email because there are literally millions of queries on this field per day, and its a bit slow without the key.
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Is there a faster/shorter way to initialize variables in a Rust struct?
In the following example, I would much prefer to assign a value to each field in the struct in the declaration of the fields. Alternatively, it effectively takes one additional statement for each field to assign a value to the fields. All I want to be able to do is to assign default values when the ...
If threads share the same PID, how can they be identified?
I have a query related to the implementation of threads in Linux.
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Where is the syntax for TypeScript comments documented?
Is the syntax for TypeScript comments documented anywhere?
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Difference between static and shared libraries?
What is the difference between static and shared libraries?
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How do I search an SQL Server database for a string?
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Get fragment (value after hash '#') from a URL in php [closed]
How can i select the fragment after the '#' symbol in my URL using PHP?
The result that i want is "photo45".
10 Answers
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