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How to get the nth element of a python list or a default if not available
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try:
a = b[n]
except IndexError:
a = default
Edit: I removed the check for TypeError - probably better to let the caller handle this.
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im...
How to write to file in Ruby?
...ile = File.open("/tmp/some_file", "w")
file.write("your text")
rescue IOError => e
#some error occur, dir not writable etc.
ensure
file.close unless file.nil?
end
You can find it in documentation:
static VALUE rb_io_s_open(int argc, VALUE *argv, VALUE klass)
{
VALUE io = rb_class_ne...
Best way to alphanumeric check in JavaScript
...character ranges manually:
if (!input_string.match(/^[0-9a-z]+$/))
show_error_or_something()
Here ^ means beginning of string and $ means end of string, and [0-9a-z]+ means one or more of character from 0 to 9 OR from a to z.
More information on Javascript regexen here:
https://developer.mozil...
Openssl is not recognized as an internal or external command
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Getting error " Both context and applicationId must be non-null", when used above code. @SagarChavada
– Yesha Shah
Nov 3 '18 at 7:11
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How can a Java variable be different from itself?
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Or lead into a compile error, if a is declared as String a = "Nope"; That why I asked for the type of 'a'
– Christian Kuetbach
Dec 4 '13 at 12:16
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Batch file to copy files from one folder to another folder
...rce d:\target, put "" around the c:\source and d:\target,otherwise you get error.
ie if there are spaces in the path ie if you have:
"C:\Some Folder\*.txt"
but not required if you have:
C:\SomeFolder\*.txt
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Which HTML elements can receive focus?
...aElement/HTMLButtonElement but not with disabled (IE actually gives you an error if you try), and file uploads have unusual behaviour for security reasons
HTMLIFrameElement (though focusing it doesn't do anything useful). Other embedding elements also, maybe, I haven't tested them all.
Any element w...
“var” or no “var” in JavaScript's “for-in” loop?
...obal (if you are in a strict mode, using strict, global variables throw an error). This can lead to problems like the following.
function f (){
for (i=0; i<5; i++);
}
var i = 2;
f ();
alert (i); //i == 5. i should be 2
If you write var i in the for loop the alert shows 2.
JavaScript Scopi...
How to filter Android logcat by application? [duplicate]
...V — Verbose (lowest priority)
D — Debug
I — Info
W — Warning
E — Error
F — Fatal
S — Silent (highest priority, on which nothing is ever printed)
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Android Bitmap to Base64 String
...ng variable is not a good idea, because, again, it might cause OutOfMemory errors. But at least we have cut the memory consumption by half by eliminating the byte array.
If you want to skip the write-to-a-file step, you have to convert the OutputStream to an InputStream, which is not so straightfor...