有没有机会将当前vim缓冲区的内容写入stdout?
我想使用vim编辑通过stdin传递的内容 - 无需临时文件来检索修改后的内容(在Linux/Unix上).
是否有可能插件/脚本 - 退出或保存时将缓冲区内容放入stdout?
我有一个GUI应用程序,需要从GUI主循环旁边的网络中获取和解析各种资源.我使用python多处理模块搜索了选项,因为这些获取操作不仅包含阻塞IO而且还包含大量解析,因此多处理可能比python线程更好.使用Twisted会很容易,但这次Twisted不是一个选项.
我找到了一个简单的解决方案:
问题是在MainThread中没有调用回调.
所以我想出了以下解决方案:
delegate.py
import os
import multiprocessing as mp
import signal
from collections import namedtuple
import uuid
import logging
_CALLBACKS = {}
_QUEUE = mp.Queue()
info = logging.getLogger(__name__).info
class Call(namedtuple('Call', 'id finished result error')):
def attach(self, func):
if not self.finished:
_CALLBACKS.setdefault(self.id, []).append(func)
else:
func(self.result or self.error)
return self
def callback(self):
assert self.finished, 'Call not finished yet'
r = self.result or self.error
for func in _CALLBACKS.pop(self.id, []):
func(r)
def done(self, result=None, error=None):
assert not self.finished, 'Call already finished' …
Run Code Online (Sandbox Code Playgroud) 我想在select子句中使用多个数组。显而易见的一个没有用,postgresql指向ROWS FROM()
...
select * from unnest(array[1,2], array[3,4]) as (a int, b int);
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错误:
UNNEST() with multiple arguments cannot have a column definition list
LINE 1: select * from unnest(array[1,2], array[3,4]) as (a int, b in...
^
HINT: Use separate UNNEST() calls inside ROWS FROM(), and attach a column definition list to each one.
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...
select * from rows from (unnest(array[1,2]), unnest(array[3,4])) as (a int, b int);
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错误:
ROWS FROM() with multiple functions cannot have a column definition list …
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