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Pandas: Looking up the list of sheets in an excel file
...openpyxl and other such libraries and all of them seem to take exponential time as the file size increase as it reads the entire file. The other solutions mentioned above where they used 'on_demand' did not work for me. If you just want to get the sheet names initially, the following function works ...
Clean code to printf size_t in C++ (or: Nearest equivalent of C99's %z in C++)
... It is not that easy. Whether %z is supported or not depends on the runtime, not the compiler. Using __GNUC__ is therefore a bit of a problem, if you mix GCC/mingw with msvcrt (and without using mingw's augmented printf).
– jørgensen
Nov 15 '13 at 6:06
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Why does “split” on an empty string return a non-empty array?
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If you split an orange zero times, you have exactly one piece - the orange.
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PHP Get Site URL Protocol - http vs https
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While this works under most situations, there have been times where there was a configuration SNAFU and $_SERVER['HTTPS'] was actually set to "off". Your code would still regard that as "passing" the test, so should be amended to allow for that particular setting.
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What is an idiomatic way of representing enums in Go?
...ign choice, compromise between safety and performance. Consider "safe" run time bound checks every time when touching a Base typed value. Or how should one define 'overflow' behavior of Base value for arithmetics and for ++ and --? Etc.
– zzzz
Jan 20 '13 at 17:...
Iterating through a list in reverse order in java
...e, which is quite a huge side-effect. (Say you wrap this in a method, each time it is called you traverse the list the other way ^^)
– jolivier
Feb 14 '14 at 19:04
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Converting XML to JSON using Python?
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After so long time, I am a bit surprised xmltodict is not a "standard" library in some linux distributions. Altough it seems doing the job straight from what we can read, I will unfortunately use another solution like xslt conversion
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How can I store my users' passwords safely?
...f every dictionary word prefixed by your fixed salt.
A better way is each time a user changes their password, your system generate a random salt and store that salt along with the user record. It makes it a bit more expensive to check the password (since you need to look up the salt before you can...
How to decorate a class?
...s, which it can then rewrite before the class is created. You can, at that time, sub out the constructor for a new one.
Example:
def substitute_init(self, id, *args, **kwargs):
pass
class FooMeta(type):
def __new__(cls, name, bases, attrs):
attrs['__init__'] = substitute_init
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Skip List vs. Binary Search Tree
... skip lists but only barely.
transactional skip lists are consistently 2-3 times slower than the locking and non-locking versions.
locking red-black trees croak under concurrent access. Their performance degrades linearly with each new concurrent user. Of the two known locking red-black tree imple...