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multiprocessing: How do I share a dict among multiple processes?
...essing import Process, Manager
def f(d):
d[1] += '1'
d['2'] += 2
if __name__ == '__main__':
manager = Manager()
d = manager.dict()
d[1] = '1'
d['2'] = 2
p1 = Process(target=f, args=(d,))
p2 = Process(target=f, args=(d,))
p1.start()
p2.start()
p1.join()...
What is the reason for performing a double fork when creating a daemon?
...
Looking at the code referenced in the question, the justification is:
Fork a second child and exit immediately to prevent zombies. This
causes the second child process to be orphaned, making the init
process responsible for its cleanup. And, since the first child...
How to trigger event when a variable's value is changed?
...of 1 then a certain piece of code is carried out.
I know that I can use an if statement but the problem is that the value will be changed in an asynchronous process so technically the if statement could be ignored before the value has changed.
...
Truncating floats in Python
...float f to n decimal places without rounding'''
s = '{}'.format(f)
if 'e' in s or 'E' in s:
return '{0:.{1}f}'.format(f, n)
i, p, d = s.partition('.')
return '.'.join([i, (d+'0'*n)[:n]])
This is valid in Python 2.7 and 3.1+. For older versions, it's not possible to get the ...
Google Maps: how to get country, state/province/region, city given a lat/long value?
...t a search feature that would allow users to find other users within a specified location (e.g. find all users in Brooklyn, NY)? Remember, all I have are lat/longs.
– StackOverflowNewbie
Oct 25 '10 at 11:05
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How do I remove objects from a JavaScript associative array?
...ie. an array with a missing index).
When working with instances of Array, if you do not want to create a sparsely populated array - and you usually don't - then you should use Array#splice or Array#pop.
Note that the delete operator in JavaScript does not directly free memory. Its purpose is to re...
What is the difference between the add and offer methods in a Queue in Java?
...
I guess the difference is in the contract, that when element can not be added to collection the add method throws an exception and offer doesn't.
From: http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#add%28E%29
If a...
“static const” vs “#define” vs “enum”
...ar 5
enum { var = 5 };
Ignoring issues about the choice of name, then:
If you need to pass a pointer around, you must use (1).
Since (2) is apparently an option, you don't need to pass pointers around.
Both (1) and (3) have a symbol in the debugger's symbol table - that makes debugging easier. ...
How to create new folder? [duplicate]
I want to put output information of my program to a folder. if given folder does not exist, then the program should create a new folder with folder name as given in the program. Is this possible? If yes, please let me know how.
...
Check whether a value is a number in JavaScript or jQuery [duplicate]
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"!isNaN(+n) && isFinite(n)" classifies the empty string as a number
– thenickdude
Aug 29 '13 at 3:03
3
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