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Get path of executable
...os.html to select the method is straightforward.
– Clifford
Oct 7 '09 at 15:02
5
So is this what ...
Flatten nested dictionaries, compressing keys
...ems = []
for k, v in d.items():
new_key = parent_key + sep + k if parent_key else k
if isinstance(v, collections.MutableMapping):
items.extend(flatten(v, new_key, sep=sep).items())
else:
items.append((new_key, v))
return dict(items)
>>&g...
Can you break from a Groovy “each” closure?
...t an "each" without throwing an exception. You likely want a classic loop if you want the break to abort under a particular condition.
Alternatively, you could use a "find" closure instead of an each and return true when you would have done a break.
This example will abort before processing the w...
How to make “if not true condition”?
...
try
if ! grep -q sysa /etc/passwd ; then
grep returns true if it finds the search target, and false if it doesn't.
So NOT false == true.
if evaluation in shells are designed to be very flexible, and many times doesn't require...
Fastest check if row exists in PostgreSQL
...to table, but these inserts are always done in batches. So I want to check if a single row from the batch exists in the table because then I know they all were inserted.
...
In Jinja2, how do you test if a variable is undefined?
...
From the Jinja2 template designer documentation:
{% if variable is defined %}
value of variable: {{ variable }}
{% else %}
variable is not defined
{% endif %}
share
|
...
How can I check if a Perl array contains a particular value?
... turn the array into a hash:
my %params = map { $_ => 1 } @badparams;
if(exists($params{$someparam})) { ... }
You can also add more (unique) params to the list:
$params{$newparam} = 1;
And later get a list of (unique) params back:
@badparams = keys %params;
...
Fastest way to tell if two files have the same contents in Unix/Linux?
...e same data or not. I do this a for a lot of files, and in my script the diff command seems to be the performance bottleneck.
...
Easy way to test a URL for 404 in PHP?
...
If you are using PHP's curl bindings, you can check the error code using curl_getinfo as such:
$handle = curl_init($url);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE);
/* Get the HTML or whatever is linked in $url. *...
Is 'switch' faster than 'if'?
Is a switch statement actually faster than an if statement?
12 Answers
12
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