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mongodb: insert if not exists
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157
Sounds like you want to do an "upsert". MongoDB has built-in support for this. Pass an extra...
Converting from a string to boolean in Python?
...e'
Or to checks against a whole bunch of values:
s.lower() in ['true', '1', 't', 'y', 'yes', 'yeah', 'yup', 'certainly', 'uh-huh']
Be cautious when using the following:
>>> bool("foo")
True
>>> bool("")
False
Empty strings evaluate to False, but everything else evaluates to...
ZeroMQ的学习和研究（PHP代码实例） - C/C++ - 清泛网 - 专注C/C++及内核技术
...息通信。几年的竞争下来，Apache 基金会旗下的符合 AMQP/1.0标准的 RabbitMQ 已经得到了广泛的认可，成为领先的 MQ 项目。
与 RabbitMQ 相比，ZMQ 并不像是一个传统意义上的消息队列服务器，事实上，它也根本不是一个服务器，它更...
Read user input inside a loop
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107
Read from the controlling terminal device:
read input </dev/tty
more info: http://compgr...
Objective-C parse hex string to integer
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169
Joshua Weinberg's answer is mostly correct, however the 0x prefix is optional when scanning he...
Throttling method calls to M requests in N seconds
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14 Answers
14
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Hexadecimal To Decimal in Shell Script
... to do it in the shell or with an external program:
With bash:
$ echo $((16#FF))
255
with bc:
$ echo "ibase=16; FF" | bc
255
with perl:
$ perl -le 'print hex("FF");'
255
with printf :
$ printf "%d\n" 0xFF
255
with python:
$ python -c 'print(int("FF", 16))'
255
with ruby:
$ ruby -e '...
Mathematical functions in Swift
... easily discover your playground platform by opening File Inspector (⌥⌘1).
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How do I add a path to PYTHONPATH in virtualenv
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157
You can usually avoid having to do anything with PYTHONPATH by using .pth files. Just put a fi...