struct

问题 Is there a data type in Python similar to structs in C++? I like the struct feature myStruct.someName . I know that classes have this, but I don't want to write a class everytime I need a "container" for some data. 回答1: Why not? Classes are fine for that. If you want to save some memory, you might also want to use __slots__ so the objects don't have a __dict__ . See http://docs.python.org/reference/datamodel.html#slots for details and Usage of __slots__? for some useful information. For

问题 I am writing a quick ssh config to json processor in golang. I have the following stuct: type SshConfig struct { Host string Port string User string LocalForward string ... } I am currently looping over every line of my ssh config file and splitting the line on spaces and checking which property to update. if split[0] == "Port" { sshConfig.Port = strings.Join(split[1:], " ") } Is there a way to check a property exists and then set it dynamically? 回答1: Use the reflect package to set a field by

问题 I'm writing a userspace driver for accessing FPGA registers in Python 3.5 that mmap s the FPGA's PCI address space, obtains a memoryview to provide direct access to the memory-mapped register space, and then uses struct.pack_into("<I", ...) to write a 32-bit value into the selected 32-bit aligned address. def write_u32(address, data): assert address % 4 == 0, "Address must be 32-bit aligned" path = path.lib.Path("/dev/uio0") file_size = path.stat().st_size with path.open(mode='w+b') as f: mv

问题 I'm writing a userspace driver for accessing FPGA registers in Python 3.5 that mmap s the FPGA's PCI address space, obtains a memoryview to provide direct access to the memory-mapped register space, and then uses struct.pack_into("<I", ...) to write a 32-bit value into the selected 32-bit aligned address. def write_u32(address, data): assert address % 4 == 0, "Address must be 32-bit aligned" path = path.lib.Path("/dev/uio0") file_size = path.stat().st_size with path.open(mode='w+b') as f: mv

问题 I'm writing a userspace driver for accessing FPGA registers in Python 3.5 that mmap s the FPGA's PCI address space, obtains a memoryview to provide direct access to the memory-mapped register space, and then uses struct.pack_into("<I", ...) to write a 32-bit value into the selected 32-bit aligned address. def write_u32(address, data): assert address % 4 == 0, "Address must be 32-bit aligned" path = path.lib.Path("/dev/uio0") file_size = path.stat().st_size with path.open(mode='w+b') as f: mv

问题 I'm writing a userspace driver for accessing FPGA registers in Python 3.5 that mmap s the FPGA's PCI address space, obtains a memoryview to provide direct access to the memory-mapped register space, and then uses struct.pack_into("<I", ...) to write a 32-bit value into the selected 32-bit aligned address. def write_u32(address, data): assert address % 4 == 0, "Address must be 32-bit aligned" path = path.lib.Path("/dev/uio0") file_size = path.stat().st_size with path.open(mode='w+b') as f: mv

问题 I have a pyspark df who's schema looks like this root |-- company: struct (nullable = true) | |-- 0: long(nullable = true) | |-- 1: long(nullable = true) | |-- 10: long(nullable = true) | |-- 100: long(nullable = true) | |-- 101: long(nullable = true) | |-- 102: long(nullable = true) | |-- 103: long(nullable = true) | |-- 104: long(nullable = true) | |-- 105: long(nullable = true) | |-- 106: long(nullable = true) | |-- 107: long(nullable = true) | |-- 108: long(nullable = true) | |-- 109:

问题 When I execute this: buf := new(bytes.Buffer) buf.WriteString("Hello world") fmt.Println(buf) it prints Hello World . But if I execute this: var buf bytes.Buffer buf.WriteString("Hello world") fmt.Println(buf) it prints: {[72 101 108 108 111 32 119 111 114 108 100] 0 [72 101 108 108 111 32 119 111 114 108 100 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] 0} I understand that this is the content of the structure byte.Buffer but why

问题 Having this schema: root |-- Elems: array (nullable = true) | |-- element: struct (containsNull = true) | | |-- Elem: integer (nullable = true) | | |-- Desc: string (nullable = true) How can we add a new field like that? root |-- Elems: array (nullable = true) | |-- element: struct (containsNull = true) | | |-- New_field: integer (nullable = true) | | |-- Elem: integer (nullable = true) | | |-- Desc: string (nullable = true) I've already done that with a simple struct (more detail at the

问题 I'm trying to unmarshall JSON into a struct, but it's proving difficult because the outer JSON key changes and I only started go a week ago. This is my manual attempt: import ( "encoding/json" "fmt" "strconv" ) type Device struct { localUUID string applicationUUID string externalUUID string commit string lastSeen string state string progress float32 } func main() { devices := make([]*Device, 0, 10) b := []byte(`{ "5417871461137421886": { "applicationUUID": "test_applicationUUID", "commit":