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Extract value of attribute node via XPath
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What if i would like to extract only the value/description/data present in between the tags ....
– Dinu Duke
Feb 22 '17 at 7:52
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Why can't variable names start with numbers?
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It's a convention now, but it started out as a technical requirement.
In the old days, parsers of languages such as FORTRAN or BASIC did not require the uses of spaces. So, basically, the following are identical:
10 V1=100
20 PRINT V1
and
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SQL Add foreign key to existing column
If I am using the following SQL command in SQL Server 2008 to update a table with a foreign key constraint:
6 Answers
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How to check whether a variable is a class or not?
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If you also want inspect.isclass to return True if the object to inspect is a class instance, use inspect.isclass(type(Myclass()))
– michaelmeyer
Apr 18 '13 at 16:21
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cancelling a handler.postdelayed process
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If you can afford to cancel all callbacks and messages on the handler and don't want to have to keep references to the runnable the third point in the accepted answer to this question is another alternative that seems to work...
Trigger a button click with JavaScript on the Enter key in a text box
... was pretty much synonymous with JS back when this answer was posted. But now a lot of us who avoid jQuery altogether (because it's just a waste of kb when you're using something like React) feel annoyed when we search for answers to JS questions and often the first thing that comes up is a library...
RegEx for Javascript to allow only alphanumeric
... a reg ex that only allows alphanumeric. So far, everyone I try only works if the string is alphanumeric, meaning contains both a letter and a number. I just want one what would allow either and not require both.
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Showing the stack trace from a running Python application
... a process will be running for a long time but gets stuck sometimes for unknown and irreproducible reasons. Its a bit hacky, and only works on unix (requires signals):
import code, traceback, signal
def debug(sig, frame):
"""Interrupt running process, and provide a python prompt for
inter...
Collect successive pairs from a stream
...r;
return pair;
}
}).skip(1); // drop first null
Now you can limit your stream to the length you want
pairStream.limit(1_000_000).forEach(i -> System.out.println(i));
P.S. I hope there is better solution, something like clojure (partition 2 1 stream)
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Why is parenthesis in print voluntary in Python 2.7?
... a Tuple. This special treatment of the print statement enables it to act differently if there is a trailing , or not.
Happy coding.
*This print behavior in Python 2 can be changed to that of Python 3:
from __future__ import print_function
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