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A python class that acts like dict
... self.__dict__ is not the same as the actual dictionary content. Every python object, regardless of its type, has a _dict__ which contains all the object attributes (methods, fields, etc). You do not want to mess around with this unless you want to write code that is modifying itself...
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MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
...新CHANGE MASTER TO即可，系统会抛弃当前的中继日志，重新下载：
mysql> CHANGE MASTER TO
MASTER_LOG_FILE='<Relay_Master_Log_File>',
MASTER_LOG_POS=<Exec_Master_Log_Pos>;
mysql> START SLAVE;
至于为什么使用的是Relay_Master_Log_File & Exec_Master_Log_Pos...
Concurrent.futures vs Multiprocessing in Python 3
Python 3.2 introduced Concurrent Futures , which appear to be some advanced combination of the older threading and multiprocessing modules.
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u'\ufeff' in Python string
...endian UTF-16 encoding. If you decode the web page using the right codec, Python will remove it for you. Examples:
#!python2
#coding: utf8
u = u'ABC'
e8 = u.encode('utf-8') # encode without BOM
e8s = u.encode('utf-8-sig') # encode with BOM
e16 = u.encode('utf-16') # encode with BOM
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Define a lambda expression that raises an Exception
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There is more than one way to skin a Python:
y = lambda: (_ for _ in ()).throw(Exception('foobar'))
Lambdas accept statements. Since raise ex is a statement, you could write a general purpose raiser:
def raise_(ex):
raise ex
y = lambda: raise_(Excepti...
Determine the line of code that causes a segmentation fault?
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I switched to arch-linux recently. My current directory doesn't contain the core dump file. How can I generate it?
– Abhinav
Nov 30 '16 at 5:44
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How do I validate a date string format in python?
I have a python method which accepts a date input as a string .
5 Answers
5
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Understanding the map function
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map isn't particularly pythonic. I would recommend using list comprehensions instead:
map(f, iterable)
is basically equivalent to:
[f(x) for x in iterable]
map on its own can't do a Cartesian product, because the length of its output list is ...
What is an OS kernel ? How does it differ from an operating system? [closed]
...dia player". A kernel doesn't match that definition.
So for an end-user a Linux distribution (say Ubuntu) is an Operating System while for a programmer the Linux kernel itself is a perfectly valid OS depending on what you're trying to achieve. For instance embedded systems are mostly just kernel wi...
How to send POST request?
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If you really want to handle with HTTP using Python, I highly recommend Requests: HTTP for Humans. The POST quickstart adapted to your question is:
>>> import requests
>>> r = requests.post("http://bugs.python.org", data={'number': 12524, 'type': 'iss...