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How do you check in python whether a string contains only numbers?
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Use str.isdigit:
>>> "12345".isdigit()
True
>>> "12345a".isdigit()
False
>>>
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How to create NS_OPTIONS-style bitmask enumerations in Swift?
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Swift 3.0
Almost identical to Swift 2.0. OptionSetType was renamed to OptionSet and enums are written lower case by convention.
struct MyOptions : OptionSet {
let rawValue: Int
static let firstOption = MyOptions(rawValu...
PHP json_decode() returns NULL with valid JSON?
...l json_last_error() because it's PHP 5.2.9. That function appears on PHP 5.3.0.
– Joel A. Villarreal Bertoldi
Mar 9 '10 at 15:54
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Render HTML to an image
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43
I know this is quite an old question which already has a lot of answers, yet I still spent hours...
How can I redirect the output of the “time” command?
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edited Mar 9 '10 at 12:37
Motti
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How to create a Menubar application for Mac
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133
NSStatusItem is what you are looking for. Also add LSUIElement with string value of 1 to your I...
sql ORDER BY multiple values in specific order?
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183
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WHERE
x_field IN ('f', 'p', 'i', 'a') ...
ORDER BY
CASE x_field
WHEN 'f' THEN 1
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iOS application: how to clear notifications?
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answered Dec 30 '11 at 18:42
Patrick PeriniPatrick Perini
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The difference between Classes, Objects, and Instances
...of a reference type.
An object is a class instance or an array. (JLS 4.3.1)
That's the type theoretic view.
In practice, most Java developers treat the words "instance" and "object" as synonyms. (And that includes me then I'm trying to explain something quickly.) And most developers use t...
S3 Error: The difference between the request time and the current time is too large
...he request time and the current time is too large when call method amazons3.ListObjects
18 Answers
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