slice

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am building and distributing an iOS Framework library for consumption by other developers. Recently I ran into a bug (feature?) of the Apple Store whereby if an iOS Framework is built with the x86 Architecture (for the simulator) then the entire app fails App Store approval with the error: [Transporter Error Output]: ERROR ITMS-90087: "Unsupported Architectures. The executable for blah.app/Frameworks/MyLib.framework contains unsupported architectures '[x86_64, i386]'." What is the best practice here? Should I: Include debug (with simulator

I am trying to figure out a way to initialize a hash without having to go through a loop. I was hoping to use slices for that, but it doesn't seem to produce the expected results. Consider the following code: #!/usr/bin/perl use Data::Dumper; my %hash = (); $hash{currency_symbol} = 'BRL'; $hash{currency_name} = 'Real'; print Dumper(%hash); This does work as expect and produce the following output: $VAR1 = 'currency_symbol'; $VAR2 = 'BRL'; $VAR3 = 'currency_name'; $VAR4 = 'Real'; When I try to use slices as follows, it doesn't work: #!/usr/bin/perl use Data::Dumper; my %hash = (); my @fields =

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've recently been messing around with Go and I wanted to see how it would be to delete an element from a two-dimensional slice. For deleting an element from a one-dimensional slice, I can successfully use: data = append(data[:i], data[i+1:]...) However, with a two-dimensional slice, using: data = append(data[i][:j], data[i][j+1:]...) throws the error: cannot use append(data[i][:j], data[i][j+1:]...) (type []string) as type [][]string in assignment Would tackling this require a different approach? 回答1: A 2D slice in Go is nothing more than a

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Original question I need an utility type Subtract<A, B> where A and B are numbers. For example: type Subtract<A extends number, B extends number> = /* implementation */ const one: Subtract<2, 1> = 1 const two: Subtract<4, 2> = 2 const error: Subtract<2, 1> = 123 // Error here: 123 is not assignable to type '1'. Arguments to the Subtract<A, B> are always number literals or compile time constants. I do not need let foo: Subtract<number, number> // 'foo' may have 'number' type. Edited question Ok, I think that above text probably is the XY

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I would like to use multiprocessing pool with an iterator in order to execute a function in a thread splitting the iterator in N elements until the iterator is finish. import arcpy from multiprocessing import Pool def insert(rows): with arcpy.da.InsertCursor("c:\temp2.gdb\test" fields=["*"]) as i_cursor: #i_cursor is an iterator for row in rows: i_cursor.insertRow(row) input_rows = [] count = 0 pool = Pool(4) with arcpy.da.SearchCursor("c:\temp.gdb\test", fields=["*"]) as s_cursor: #s_cursor is an iterator for row in s_cursor: if (count My

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I always thought that omitting arguments in the python slice operation would result into: start = 0 end = len(lst) step = 1 That holds true if the step is positive, but as soon as the step is negative, like in the "reverse slice" [::-1] , omitting start/end results in: start = len(lst)-1 end = None Is this a special case, or am I missing something? 回答1: The default is always None ; it is up to the type to determine how to handle None for any of the 3 values. The list object is simply passed a slice(None, None, -1) object in this

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I use Spark-shell to do the below operations Recently loaded a table with an array column in spark-sql . Here is the ddl for the same: create table test_emp_arr{ dept_id string, dept_nm string, emp_details Array } the data looks something like this +-------+-------+-------------------------------+ |dept_id|dept_nm| emp_details| +-------+-------+-------------------------------+ | 10|Finance|[Jon, Snow, Castle, Black, Ned]| | 20| IT| [Ned, is, no, more]| +-------+-------+-------------------------------+ i can query the emp_details column

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I wonder how to get the list name or group name as a flag when using pipe operation with purrr. for example: I want to use a dynameic parameter of each list name pass to the ggsave function. require ( purrr ) require ( ggplot2 ) lst = list ( a1 = data . frame ( x = 1 : 10 , y = 2 : 11 ), a2 = data . frame ( x = 1 : 10 , y =- 1 * 2 : 11 )) df = rbind ( transform ( lst [[ 1 ]], id = "a1" ), transform ( lst [[ 2 ]], id = "a2" )) lst %>% map (~ ggsave ( plot = qplot ( data =., x = "x" , y = "y" , geom = "line" ), file = paste (