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Get Image size WITHOUT loading image into memory
... the docstring for .open says:
def open(fp, mode="r"):
"Open an image file, without loading the raster data"
There are a few file operations in the source like:
...
prefix = fp.read(16)
...
fp.seek(0)
...
but these hardly constitute reading the whole file. In fact .open simply returns...
Rails filtering array of objects by attribute value
... :
This is fine :
@logos = @attachments.select { |attachment| attachment.file_type == 'logo' }
@images = @attachments.select { |attachment| attachment.file_type == 'image' }
but for performance wise you don't need to iterate @attachments twice :
@logos , @images = [], []
@attachments.each do |a...
Importing variables from another file?
How can I import variables from one file to another?
8 Answers
8
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Run a PostgreSQL .sql file using command line arguments
I have some .sql files with thousands of INSERT statements in them and need to run these inserts on my PostgreSQL database in order to add them to a table. The files are that large that it is impossible to open them and copy the INSERT statements into an editor window and run them there. I found on ...
How do you determine the ideal buffer size when using FileInputStream?
I have a method that creates a MessageDigest (a hash) from a file, and I need to do this to a lot of files (>= 100,000). How big should I make the buffer used to read from the files to maximize performance?
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SQLite Concurrent Access
...contention could become an issue. A lot would then depend on how fast your filesystem is, since the SQLite engine itself is extremely fast and has many clever optimizations to minimize contention. Especially SQLite 3.
For most desktop/laptop/tablet/phone applications, SQLite is fast enough as there...
Extract file basename without path and extension in bash [duplicate]
Given file names like these:
9 Answers
9
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JSLint: was used before it was defined
Hi I have the 3 javascript files.
2 Answers
2
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How do I specify different Layouts in the ASP.NET MVC 3 razor ViewStart file?
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You could put a _ViewStart.cshtml file inside the /Views/Public folder which would override the default one in the /Views folder and specify the desired layout:
@{
Layout = "~/Views/Shared/_PublicLayout.cshtml";
}
By analogy you could put another _View...
Unix's 'ls' sort by name
... default. What are you seeing?
man ls states:
List information about the FILEs (the current directory by default). Sort entries alpha‐betically if none of -cftuvSUX nor --sort is specified.:
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