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Difference between subprocess.Popen and os.system
...else. subprocess.Popen() replaces several other tools (os.system() is just one of those) that were scattered throughout three other Python modules.
If it helps, think of subprocess.Popen() as a very flexible os.system().
sh...
How do I determine the size of my array in C?
...ielding the number of bytes in the object and that sizeof (char) is always one. The number of bits in a byte is implementation specific. Edit: ANSI C++ standard section 5.3.3 Sizeof: "The sizeof operator yields the number of bytes in the object representation of its operand. [...] sizeof (char), siz...
Using IQueryable with Linq
...RM systems, you have the option of fetching data from a table in two ways, one which returns IEnumerable<T>, and one which returns an IQueryable<T>. Say, for example, you have a Products table, and you want to get all of the products whose cost is >$25.
If you do:
IEnumerable<P...
What's the difference between “Request Payload” vs “Form Data” as seen in Chrome dev tools Network t
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Is there a reason to prefer one over the other in terms of size etc.. Specifically for lightweight AJAX calls?
– user
Aug 8 '14 at 14:10
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How do I hide .class files from the Open Resource dialog in Eclipse?
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One option is to filter derived resources. In the upper right corner of the 'Open Resource' dialog there is an arrow you can click to bring up a dropdown menu for filtering. Uncheck the 'Show Derived Resources' option, if i...
Get keys from HashMap in Java
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A HashMap contains more than one key. You can use keySet() to get the set of all keys.
team1.put("foo", 1);
team1.put("bar", 2);
will store 1 with key "foo" and 2 with key "bar". To iterate over all the keys:
for ( String key : team1.keySet() ) {
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extract part of a string using bash/cut/split
...tch from the beginning (think of a comment line) and % means from the end. One instance means shortest and two instances means longest.
You can get substrings based on position using numbers:
${MYVAR:3} # Remove the first three chars (leaving 4..end)
${MYVAR::3} # Return the first three charact...
Where does Java's String constant pool live, the heap or the stack?
..., the exact location of the string pool is not specified and can vary from one JVM implementation to another.
It is interesting to note that until Java 7, the pool was in the permgen space of the heap on hotspot JVM but it has been moved to the main part of the heap since Java 7:
Area: HotSpot
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What is the difference between const and readonly in C#?
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The part about reference values is the most important one. Const values can be optimized away.
– CodingBarfield
Jun 5 '13 at 7:03
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“Add as Link” for folders in Visual Studio projects
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Try to use: <None>...</None> instead of <Compile>...</Compile>. But i think, it will copy those files anyway.Even VisualStudio does this with linked files.
– mo.
Sep 21 '12 at 11:...