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Python - write() versus writelines() and concatenated strings
...before writelines() starts to write the data. First of all, this may waste time. Why not start writing parts of data while reading other parts? But, most importantly, this approach can be very memory consuming. In an extreme scenario, where the input file is larger than the memory of your machine, t...
Evaluating a mathematical expression in a string
...he above code has only been tested on Python 3.
If desired, you can add a timeout decorator on this function.
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jQuery’s .bind() vs. .on()
... .bind instead.
However, .bind may be removed from future versions at any time. There is no reason to keep using .bind and every reason to prefer .on instead.
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What's the common practice for enums in Python? [duplicate]
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I've seen this pattern several times:
>>> class Enumeration(object):
def __init__(self, names): # or *names, with no .split()
for number, name in enumerate(names.split()):
setattr(self, name, number)
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How can I search for a commit message on GitHub?
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+1 You have saved me fruitless time in GitHub wondering how to achieve what I supposed would be an obvious piece of functionality. So we now have to clone the repo locally to grep via the command line instead. Jeez, that's progress eh?! ;)
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error: passing xxx as 'this' argument of xxx discards qualifiers
...assumption that getId() might attempt to modify the object but at the same time, it also notices that the object is const; so any attempt to modify the const object should be an error. Hence compiler generates an error message.
The solution is simple: make the functions const as:
int getId() cons...
Include another JSP file
... you're doing is a static include. A static include is resolved at compile time, and may thus not use a parameter value, which is only known at execution time.
What you need is a dynamic include:
<jsp:include page="..." />
Note that you should use the JSP EL rather than scriptlets. It also...
What does middleware and app.use actually mean in Expressjs?
...sn't do anything unless you handle it. Express will handle the stack every time an incoming HTTP request is caught on the server. With middleware you handle the stack manually.
// express, you need to do nothing
// middleware
stack.handle(someData);
A more complete example :
var middleware = req...
How can mixed data types (int, float, char, etc) be stored in an array?
...nated union, disjoint union, or sum type, ... It's been reinvented so many times it has many names (kind of like dictionaries, hashes, associative arrays, etc.).
– Barmar
Sep 2 '13 at 17:40
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Check whether a string is not null and not empty
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@user1154390: sometimes its worth explicitly using true and false for clarity, but when condition returns true for true and false for false, its unnecessary complexity. Simply say (str != null && str.length() > 0).
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