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What does ** (double star/asterisk) and * (star/asterisk) do for parameters?
...r(**kwargs):
for a in kwargs:
print(a, kwargs[a])
bar(name='one', age=27)
# age 27
# name one
Both idioms can be mixed with normal arguments to allow a set of fixed and some variable arguments:
def foo(kind, *args, **kwargs):
pass
It is also possible to use this the other way ...
Is “argv[0] = name-of-executable” an accepted standard or just a common convention?
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Thanks everyone! Great discussion from a (seemingly) simple question. Although Richard's answer is valid for *nix operating systems, I picked paxdiablo's answer because I'm less interested in the behavior of a specific OS, and primaril...
What is the significance of load factor in HashMap?
...ing the same hash). When collision occurs the lookup time increases, as in one bucket there will be >1 matching entries, for which the key must be individually checked for equality. Some detailed math: preshing.com/20110504/hash-collision-probabilities
– atimb
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How to convert ASCII code (0-255) to its corresponding character?
... new String(new char[] { 65 })
You will end up with a string of length one, whose single character has the (ASCII) code 65. In Java chars are numeric data types.
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Clear text from textarea with selenium
...the proper error message appears when text in certain fields are invalid. One check for validity is that a certain textarea element is not empty.
...
How can I check if string contains characters & whitespace, not just whitespace?
...g to see if there's only whitespace, just check to see if there's at least one character of non whitespace:
if (/\S/.test(myString)) {
// string is not empty and not just whitespace
}
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How to prevent XSS with HTML/PHP?
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One of the most important steps is to sanitize any user input before it is processed and/or rendered back to the browser. PHP has some "filter" functions that can be used.
The form that XSS attacks usually have is to insert...
How to modify PATH for Homebrew?
...l homebrew first. Ran brew doctor, and it's giving me a bunch of warnings. One of which is:
5 Answers
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URL query parameters to dict python
...a list, because there might be multiple values. If you just want the first one:
>>> from urllib.parse import urlsplit, parse_qs
>>>
>>> url = "http://www.example.org/default.html?ct=32&op=92&item=98"
>>> query = urlsplit(url).query
>>> params = p...
Jackson: how to prevent field serialization
...hacking the annotations on both accessors and keeps all the information in one place:
public class User {
@JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
private String password;
}
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