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How to upgrade all Python packages with pip?
Is it possible to upgrade all Python packages at one time with pip ?
55 Answers
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What is a semaphore?
...mer.
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Here an important point is made that mutexes interfere with real time operating systems in a bad way, causing priority inversion where a less important task may be executed before a more important task because of resource sharing. In short, this happens when a lower priority task uses a m...
How to find out which processes are using swap space in Linux?
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Same output ten times faster: for file in /proc/*/status ; do awk '/Tgid|VmSwap|Name/{printf $2 " " $3}END{ print ""}' $file; done | grep kB | sort -k 3 -n for Debian/RH 6x+, Arch, Ubuntu (RH 5x has VmSize) (source). Like @dgunchev it does ...
SQL to determine minimum sequential days of access?
...is value is then re-added to the zero date yielding the same date with the time truncated.
– IDisposable
Jul 24 '09 at 8:21
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Pandas - How to flatten a hierarchical index in columns
I have a data frame with a hierarchical index in axis 1 (columns) (from a groupby.agg operation):
17 Answers
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How to easily map c++ enums to strings
...gs from a text file and generate a .h file with the static char at compile time. ="Write programs to write programs"
– Martin Beckett
Mar 5 '09 at 15:39
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What's the difference between the Dependency Injection and Service Locator patterns?
... But how do you handle the case where you have to create objects during runtime? If you create them manually with "new" you cannot make use of DI. If you call the DI framework for help, you're breaking the pattern. So what options are left?
– Boris
Apr 10 '13 a...
When should I use a struct instead of a class?
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I would use structs when:
an object is supposed to be read only(every time you pass/assign a struct it gets copied). Read only objects are great when it comes to multithreaded processing as they don't requite locking in most cases.
an object is small and short-living. In such a case there is a...
Python: most idiomatic way to convert None to empty string?
What is the most idiomatic way to do the following?
16 Answers
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Which way is best for creating an object in JavaScript? Is `var` necessary before an object property
... you happen to have all the properties you wish to set on hand at creation time.
For setting properties later, the NewObject.property1 syntax is generally preferable to NewObject['property1'] if you know the property name. But the latter is useful when you don't actually have the property's name a...