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How to call an external command?
...e flexible (you can get the stdout, stderr, the "real" status code, better error handling, etc...).
The official documentation recommends the subprocess module over the alternative os.system():
The subprocess module provides more powerful facilities for spawning new processes and retrieving the...
Hook up Raspberry Pi via Ethernet to laptop without router? [closed]
...ing the PI from the host. But when I try ssh, I get the connection refused error you mentioned in your answer. And yes, I did create the empty ssh file in the boot partition of my PI. According to the release notes downloads.raspberrypi.org/raspbian/release_notes.txt this should still be a valid app...
how to ignore namespaces with XPath
...ocument due to a 'The 'xmlns' attribute is bound to the reserved namespace error.
– AutomatedChaos
Nov 21 '18 at 10:50
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Using an ORM or plain SQL? [closed]
... I was saying: even the most basic scenarios can potentially be subject to errors in different DBMSes - for instance, different handling of NULLs.
– Anton Gogolev
Jan 30 '09 at 8:17
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What is the difference between concurrency and parallelism?
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@thebugfinder, To make sure there is no more room for error in Thomas' example. Concurrency is like a person juggling with only 1 hand. Regardless of how it seems the person is only holding at most one ball at a time. Parallelism is when the juggler uses both hands.
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Read an Excel file directly from a R script
...ta (i.e., not comma-formatted numbers, dates, formulas with divide-by-zero errors, missing values, etc. etc. ..) I generally have no problem with this process.
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Apply multiple functions to multiple groupby columns
... uses other columns (like lambda x: x['D'][x['C'] < 3].sum() above: "KeyError: 'D'"). Any idea if that's possible?
– beardc
Jan 25 '13 at 20:56
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Configuring Log4j Loggers Programmatically
...r all other log levels your want to handle.
// You mentioned TRACE and ERROR.
private static void log(LogLevel level, String logMsg) {
if(!loggingIsInitialized)
initLogging();
org.slf4j.Logger slf4jLogger = org.slf4j.LoggerFactory.getLogger("DebugLogger");
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Xcode doesn't show the line that causes a crash
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I tried this, and was thrown the error: 'info' is not a valid command. Any advice?
– achi
Mar 7 '13 at 0:14
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How can I dynamically create derived classes from a base class
...Factory call
if key not in argnames:
raise TypeError("Argument %s not valid for %s"
% (key, self.__class__.__name__))
setattr(self, key, value)
BaseClass.__init__(self, name[:-len("Class")])
newclass = type(name, (BaseClass,),{...