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MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...为MongoDB使用内存映射文件,所以必须使用64位版本。官方下载地址如下：http: www mongodb org downloads实验环境使用的Mongodb版本为mon 因为MongoDB使用内存映射文件,所以必须使用64位版本。
官方下载地址如下：http://www.mongodb.org/downloads...
How to un-escape a backslash-escaped string?
...
Basically for Python3 you want print(b"Hello,\nworld!".decode('unicode_escape'))
– ChristopheD
Apr 7 '15 at 8:35
3
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How to check for valid email address? [duplicate]
...checking SMTP servers
pip install pyDNS
or from Ubuntu
apt-get install python3-dns
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How to customize a requirements.txt for multiple environments?
...different virtualenv folders for each environment you need to switch to.
python3 -m venv venv_dev
source venv_dev/bin/activate
pip install -r pip/common.txt
pip install -r pip/dev.txt
exit
python3 -m venv venv_prod
source venv_prod/bin/activate
pip install -r pip/common.txt
exit
source venv_dev/bi...
What does the slash mean in help() output?
...nly Parameters
Positional-only parameters syntax was officially added to python3.8. Checkout what's new python3.8 - positional only arguments
PEP Related: PEP 570 -- Python Positional-Only Parameters
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How to pass a user defined argument in scrapy spider
...www.example.com/{category}'] # py36
super().__init__(**kwargs) # python3
def parse(self, response)
self.log(self.domain) # system
Taken from the Scrapy doc: http://doc.scrapy.org/en/latest/topics/spiders.html#spider-arguments
Update 2013: Add second argument
Update 2015: ...
由12306.cn谈谈网站性能技术 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...机端浏览也是这个情形）。我查看了一下12306首页的需要下载的总文件大小大约在900KB左右，如果你访问过了，浏览器会帮你缓存很多，只需下载10K左右的文件。但是我们可以想像一个极端一点的案例，1百万用户同时访问，且都...
Argparse: Way to include default values in '--help'?
...er such as argparse.RawTextHelpFormatter at the same time:
#!/usr/bin/env python3
import argparse
class ArgumentParserWithDefaults(argparse.ArgumentParser):
def add_argument(self, *args, help=None, default=None, **kwargs):
if help is not None:
kwargs['help'] = help
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How to sort objects by multiple keys in Python?
...)
In case you like your code terse.
Later 2016-01-17
This works with python3 (which eliminated the cmp argument to sort):
from operator import itemgetter as i
from functools import cmp_to_key
def cmp(x, y):
"""
Replacement for built-in function cmp that was removed in Python 3
C...
Why do people write the #!/usr/bin/env python shebang on the first line of a Python script?
...ween Python 2.x and Python 3.x, recent releases of Python 3 also provide a python3 name:
$ cat my_script.py
#!/usr/bin/env python3
import json
print("hello, json")
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