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What happens to a declared, uninitialized variable in C? Does it have a value?
...
Static variables (file scope and function static) are initialized to zero:
int x; // zero
int y = 0; // also zero
void foo() {
static int x; // also zero
}
Non-static variables (local variables) are indeterminate. Reading them prior to assigning a valu...
How to get a vertical geom_vline to an x-axis of class date?
...rror() to see where the error occurred.``'
– CoderGuy123
Apr 12 at 23:57
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How to test multiple variables against a value?
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123
I wouldn't be so quick to go for the set version. Tuple's are very cheap to create and iterate over. On my machine at least, tuples are ...
Why it's not possible to use regex to parse HTML/XML: a formal explanation in layman's terms
... or bonbon. Matching of recursive/balanced structures make these even more fun.
Wikipedia puts this nicely, in a quote by Larry Wall:
'Regular expressions' [...] are only marginally related to real regular expressions. Nevertheless, the term has grown with the capabilities of our pattern matchi...
How do you generate dynamic (parameterized) unit tests in python?
...------
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/parameterized/parameterized.py", line 233, in <lambda>
standalone_func = lambda *a: func(*(a + p.args), **p.kwargs)
File "x.py", line 12, in test_sequence
self.assertEqual(a,b)
AssertionError: 'a...
Adding new column to existing DataFrame in Python pandas
...)
As per this example (which also includes the source code of the assign function), you can also include more than one column:
df = pd.DataFrame({'a': [1, 2], 'b': [3, 4]})
>>> df.assign(mean_a=df.a.mean(), mean_b=df.b.mean())
a b mean_a mean_b
0 1 3 1.5 3.5
1 2 4 1...
Null vs. False vs. 0 in PHP
...ill get inequality.
So why are they useful ?
Well, look at the strrpos() function. It returns False if it did not found anything, but 0 if it has found something at the beginning of the string !
<?php
// pitfall :
if (strrpos("Hello World", "Hello")) {
// never exectuted
}
// smart move ...
Ant task to run an Ant target only if a file exists?
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123
This might make a little more sense from a coding perspective (available with ant-contrib: htt...
Is BCrypt a good hashing algorithm to use in C#? Where can I find it? [closed]
...ully use another attack vector (XSS, SQL Injection, CSRF, et. al.) on your site, good password security doesn't matter. That sounds like a controversial statement, but think about it: If I can get all your user information through a SQL injection attack, or I can get your users to give me their coo...
How does Google's Page Speed lossless image compression work?
... answered Dec 5 '12 at 6:19
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