To perform an, in effect, a realloc of a slice: a = append([]T(nil), a[:newSize]…) // Thanks to @Dijkstra for pointing out the missing ellipsis. If it does a copy of newSize elements to a new memory place or if it does an actual in place resize as in realloc(3) is at complete discretion of the … Read more
Possible solutions to codepoint slicing I know I can use the chars() iterator and manually walk through the desired substring, but is there a more concise way? If you know the exact byte indices, you can slice a string: let text = “Hello привет”; println!(“{}”, &text[2..10]); This prints “llo пр”. So the problem is to … Read more
http://golang.org/pkg/fmt/ fmt.Printf(“address of slice %p add of Arr %p \n”, &slice, &intarr) %p will print the address.
You create a slice by calling slice with the same fields you would use if doing [start:end:step] notation: sl = slice(0,4) To use the slice, just pass it as if it were the index into a list or string: >>> s = “ABCDEFGHIJKL” >>> sl = slice(0,4) >>> print(s[sl]) ‘ABCD’ Let’s say you have a … Read more
There’s a swap method on slices: data.swap(i, j). The original code doesn’t work because the language requires that &muts do not alias, that is, if a piece of data is accessible via an &mut, then there must be no other way to use that data. In general, for successive indexes data[i], data[j], the compiler cannot … Read more
Yes, it is fine to use None, as its behavior is specified by the documentation: The slice of s from i to j is defined as the sequence of items with index k such that i <= k < j. If i or j is greater than len(s), use len(s). If i is omitted or … Read more
The key in List<T>.slice function is the .toList() at the end, which will create a new List with the elements, using a shallow element copy. For summary: .slice() will create a new List with the shallow copy of the subset of elements; if the original list contains objects, changes to values within the objects will … Read more
You need to use “…” as suffix in order to append a slice to another slice. Like this: package main import “fmt” func main(){ a := []byte(“hello”) s := “world” a = append(a, s…) // use “…” as suffice fmt.Printf(“%s”,a) } You could try it here: http://play.golang.org/p/y_v5To1kiD
Yes, calling s[0:-1] is exactly the same as calling s[:-1]. Using a negative number as an index in python returns the nth element from the right-hand side of the list (as opposed to the usual left-hand side). so if you have a list as so: myList = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’] print myList[-1] # … Read more
By the print you posted, it seems like you have whitespaces as delimiters. pd.read_csv will read using , as default separator, so you have to explicitly state it: pd.read_csv(‘source.txt’,header=0, delim_whitespace=True)