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Best way to handle list.index(might-not-exist) in python?
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thing_index = thing_list.index(elem) if elem in thing_list else -1
One line. Simple. No exceptions.
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How To Check If A Key in **kwargs Exists?
...dditional arguments. Here's an example of a simple print() wrapper:
def my_print(*args, **kwargs):
prefix = kwargs.pop('prefix', '')
print(prefix, *args, **kwargs)
Then:
>>> my_print('eggs')
eggs
>>> my_print('eggs', prefix='spam')
spam eggs
As you can see, if prefix...
How to wait for the 'end' of 'resize' event and only then perform an action?
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Lodash is also useful here, which has _.throttle and _.debounce methods as well. I think debounce is a superior approach compared to the above accepted example.
– Kevin Leary
Oct 17 '16 at 13:11
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Get item in the list in Scala?
...y(Array(1, 2, 3), Array(4, 5, 6))
// 1. paratheses
scala> a.map(_(0))
Array[String] = Array(1, 4)
// 2. apply
scala> a.map(_.apply(0))
Array[String] = Array(1, 4)
// 3. function literal
scala> a.map(a => a(0))
Array[String] = Array(1, 4)
// 4. lift
scala> a.m...
Why 0 is true but false is 1 in the shell?
... chained shell commands.
Here is an example mkdir deleteme && cd $_ && pwd. Because the shell interprets 0 as true this command conveniently works as expected. If the shell were to interpret 0 as false then you'd have to invert the interpreted exit status for each operation.
In sho...
jQuery vs document.querySelectorAll
...oldSizzle = Sizzle,
div = document.createElement("div"),
id = "__sizzle__";
div.innerHTML = "<p class='TEST'></p>";
// Safari can't handle uppercase or unicode characters when
// in quirks mode.
if ( div.querySelectorAll && div.querySelectorAll(".TES...
Iterate over object keys in node.js
...e passed to .forEach.
Object.keys(myObject).forEach(function(element, key, _array) {
// element is the name of the key.
// key is just a numerical value for the array
// _array is the array of all the keys
// this keyword = secondArg
this.foo;
this.bar();
}, secondArg);
...
Pelican 3.3 pelican-quickstart error “ValueError: unknown locale: UTF-8”
... a solution posted here or here. Basically, add some lines to your ~/.bash_profile:
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
There is an outstanding bug report related to this issue. It appears that Python makes some assumptions about the format of locale names that aren't universally ...
How to raise a ValueError?
...trates how to raise a ValueError the way you want. By-the-way, I think find_last(), find_last_index(), or something simlar would be a more descriptive name for this function. Adding to the possible confusion is the fact that Python already has a container object method named __contains__() that does...
append new row to old csv file python
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I tried fp = open(csv_filepathwithname, 'wa') writer = csv.writer(fp) somelist = [ 3,56,3,6,56] writer.writerow((somelist)) but only the last row get append in the file.
– laspal
Mar 2 '10 at 14...