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Conditional import of modules in Python
In my program I want to import simplejson or json based on whether the OS the user is on is Windows or Linux. I take the OS name as input from the user. Now, is it correct to do the following?
...
“java.lang.OutOfMemoryError : unable to create new native Thread”
... into using Callable/Runnables under the control of an Executor if at all possible. There are plenty of standard executors with various behavior which your code can easily control.
(There are many reasons why the number of threads is limited, but they vary from operating system to operating system...
Read text file into string array (and write)
...with Scanner:
package main
import (
"bufio"
"fmt"
"log"
"os"
)
// readLines reads a whole file into memory
// and returns a slice of its lines.
func readLines(path string) ([]string, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defe...
Make sure only a single instance of a program is running
...
The following code should do the job, it is cross-platform and runs on Python 2.4-3.2. I tested it on Windows, OS X and Linux.
from tendo import singleton
me = singleton.SingleInstance() # will sys.exit(-1) if other instance is running
The latest code version is avail...
Excluding directories in os.walk
I'm writing a script that descends into a directory tree (using os.walk()) and then visits each file matching a certain file extension. However, since some of the directory trees that my tool will be used on also contain sub directories that in turn contain a LOT of useless (for the purpose of thi...
简单谈谈软件配置管理 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...确认产品的完整性并维护构件间的一致性，即确保产品是一个严格定义的构件集合。
可以理解为：验证软件产品的构造是否符合需求、标准、或合同的要求，目的是根据配置管理的过程和程序，验证所有的软件产品已经产生并...
What's Go's equivalent of argv[0]?
...
import "os"
os.Args[0] // name of the command that it is running as
os.Args[1] // first command line parameter, ...
Arguments are exposed in the os package http://golang.org/pkg/os/#Variables
If you're going to do argument handlin...
Automatically remove Subversion unversioned files
...ve-unversioned
Before that, I use this python script to do that:
import os
import re
def removeall(path):
if not os.path.isdir(path):
os.remove(path)
return
files=os.listdir(path)
for x in files:
fullpath=os.path.join(path, x)
if os.path.isfile(fullpat...
程序员之网络安全系列（六）：动态密码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，因为我对这块业务不了解，我猜银行为每个用户发放了一个公钥？（ 知道的同学，可以帮忙解释一下银行的U盾都做了什么? )
我们用数字证书确定了银行的身份，那么银行如何确定我们的身份呢？
两步验证
那么什么是两步...
Installing PG gem on OS X - failure to build native extension
...any others have had problems installing the pg gem. None of the solutions posed for others have worked for me.
15 Answers
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