variable-assignment

The difference between arrays and lists and between list and scalar context have been discussed in the Perl community quite a bit this last year (and every year, really). I have read over articles from chromatic and friedo , as well as this recommended monks node. I'm trying now to understand the goatse operator, documented in perlsecret . Here is some code I used to study it: # right side gets scalar context, so commas return rightmost item $string = qw(stuff junk things); say $string; # things # right side gets list context, so middle is list assigned in scalar context $string = () = qw

I'm a first year computer engineering student and I'm quite new here. I have been learning Java for the past three and a half months, and C++ for six months before that. My knowledge of Java is limited to defining and using own methods, absolute basics of object-oriented programming like use of static data members and member visibility. This afternoon, my computer programming prof taught us about multi-dimensional arrays in Java. About multi-dimensional arrays being simply arrays of arrays and so on. He mentioned that in nominal, educational programming, arrays beyond 2 dimensions are almost

I have gone through these questions, Python assigning multiple variables to same value? list behavior concerned with tuples, I want just variables may be a string, integer or dictionary More elegant way of declaring multiple variables at the same time The question has something I want to ask, but the accepted answer is much complex so what I'm trying to achieve, I have this variables declared, and I want to reduce this declarations to as less line of code as possible. details = None product_base = None product_identity = None category_string = None store_id = None image_hash = None image_link

Let's look at the following Go code: package main import "fmt" type Vertex struct { Lat, Long float64 } var m map[string]Vertex func main() { m = make(map[string]Vertex) m["Bell Labs"] = Vertex{ 40.68433, 74.39967, } m["test"] = Vertex{ 12.0, 100, } fmt.Println(m["Bell Labs"]) fmt.Println(m) } It outputs this: {40.68433 74.39967} map[Bell Labs:{40.68433 74.39967} test:{12 100}] However, if I Change one minor part of the test vertex declaration, by moving the right " } " 4 spaces, like so: m["test"] = Vertex{ 12.0, 100, } .. then the output changes to this: {40.68433 74.39967} map[test:{12 100}

when assign a variable to another they point to a same object, So, how to value change for one of them but variables still point same object! a = 10 b = a a -= 1 print(b) #expect to print 9 but it print 10 how to re-assign variable in python without changing id? I'm not sure whether you're confused about variables in Python, or about immutable values. So I'm going to explain both, and half the answer will probably seem like "no duh, I already knew that", but the other half should be useful. In Python—unlike, say, C—a variable is not a location where values live. It's just a name. The values

I have a text file containing simulation data (60 columns, 100k rows): a b c 1 11 111 2 22 222 3 33 333 4 44 444 ... where in the first row are variable names, and beneath (in columns) is the corresponding data (float type). I need to use all these variables with their data in Python for further calculations. For example, when I insert: print(b) I need to receive the values from the second column. I know how to import data: data=np.genfromtxt("1.txt", unpack=True, skiprows = 1) Assign variables "manually": a,b,c=np.genfromtxt("1.txt", unpack=True, skiprows = 1) But I'm having trouble with

Given the following example: declare @i int select @i = 1, @i = 2 select @i Will @i always be 2? This is about the most trivial example I can think of, but I am considering using this for swapping values in variables. I also believe this method of assignment (select) is not ANSI compliant (however useful), but don't really care to have portable code in this case. UPDATE Thanks to @MichaelFredrickson, we have @MartinSmith's answer and reference to MSDN on this. I am now struggling with what the second sentence in this documentation means, exactly (emphasis added): If there are multiple