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multiprocessing: How do I share a dict among multiple processes?
...pool.map(f, repeat(d, 10))
# `d` is a DictProxy object that can be converted to dict
pprint.pprint(dict(d))
Output:
$ python3 mul.py
{22562: 'Hi, I was written by process 22562',
22563: 'Hi, I was written by process 22563',
22564: 'Hi, I was written by process 22564',
22565: '...
What effect(s) can the virtual keyword have in Entity Framework 4.1 POCO Code First?
...ion<T> only.
They cannot be a concrete
implementation or another interface
that derives from ICollection<T> (a
difference from the Deferred Loading
proxy)
Another useful link describing this is MSDN's Requirements for Creating POCO Proxies.
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JavaScript checking for null vs. undefined and difference between == and ===
...perands are of different types, === will always return false while == will convert one or both operands into the same type using rules that lead to some slightly unintuitive behaviour. If the operands are of the same type (e.g. both are strings, such as in the typeof comparison above), == and === wi...
How do I rename a column in a SQLite database table?
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The RENAME COLUMN TO syntax changes the column-name of table table-name into new-column-name. The column name is changed both within the table definition itself and also within all indexes, triggers, and views that reference the column. If the column name change would result in a semantic ambigui...
JSON left out Infinity and NaN; JSON status in ECMAScript?
...safety/security, all a decent JSON parser would have to do when it goes to convert NaN is to yield the value 0/0 (rather than evaluating the symbol NaN) which will return the "real" NaN regardless of what the symbol NaN is redefined as.
– Jason S
Sep 17 '09 at ...
When increasing the size of VARCHAR column on a large table could there be any problems?
...
Another reason why you should avoid converting the column to varchar(max) is because you cannot create an index on a varchar(max) column.
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Why is __init__() always called after __new__()?
I'm just trying to streamline one of my classes and have introduced some functionality in the same style as the flyweight design pattern .
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Dynamic SQL - EXEC(@SQL) versus EXEC SP_EXECUTESQL(@SQL)
...p_executesql cannot be used to replace execute. Perhaps I should put the point I am trying to stress as: Use sp_executesql instead of execute whenever possible.
– Gan
Jun 17 '13 at 17:00
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How does the Google “Did you mean?” Algorithm work?
...ords as trigrams or bigrams, so that when you are performing a lookup, you convert to n-gram, and lookup via hashtable or trie.
Use heuristics related to potential keyboard mistakes based on character location. So that "hwllo" should be "hello" because 'w' is close to 'e'.
Use a phonetic key (Sounde...
Run an untrusted C program in a sandbox in Linux that prevents it from opening files, forking, etc.?
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I have used Systrace to sandbox untrusted programs both interactively and in automatic mode. It has a ptrace()-based backend which allows its use on a Linux system without special privileges, as well as a far faster and more poweful backend which requires patching the kernel.
It ...