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Python 3: UnboundLocalError: local variable referenced before assignment [duplicate]
...ng variable, but for reasons unknown (likely consistency in this context), Python treats it as an assignment). The Python interpreter sees this at module load time and decides (correctly so) that the global scope's Var1 should not be used inside the local scope, which leads to a problem when you try...
What is the common header format of Python files?
I came across the following header format for Python source files in a document about Python coding guidelines:
4 Answers
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Installing specific package versions with pip
I'm trying to install version 1.2.2 of the MySQL_python adaptor, using a fresh virtualenv created with the --no-site-packages option. The current version shown in PyPi is 1.2.3 . Is there a way to install the older version? I found an article stating that this should do it:
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pypi UserWarning: Unknown distribution option: 'install_requires'
Does anybody encounter this warning when executing python setup.py install of a PyPI package?
10 Answers
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What does -> mean in Python function definitions?
I've recently noticed something interesting when looking at Python 3.3 grammar specification :
7 Answers
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Image library for Python 3
What is python-3 using instead of PIL for manipulating Images?
8 Answers
8
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What are metaclasses in Python?
In Python, what are metaclasses and what do we use them for?
22 Answers
22
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How to calculate the CPU usage of a process by PID in Linux from C?
...to programmatically [in C] calculate CPU usage % for a given process ID in Linux.
12 Answers
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Memcached下一站：HandlerSocket！ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...编译的或官方提供的二进制版本，可以略过此步。
接着下载一份和系统MySQL版本一致的MySQL源代码和HandlerSocket源代码：
mysql-5.1.37.tar.gz
ahiguti-HandlerSocket-Plugin-for-MySQL-1.0.6-76-gf5f7443.tar.gz
shell> tar zxf mysql-5.1.37.tar.gz
shell> tar zx...
Add params to given URL in Python
...:
try:
import urlparse
from urllib import urlencode
except: # For Python 3
import urllib.parse as urlparse
from urllib.parse import urlencode
url = "http://stackoverflow.com/search?q=question"
params = {'lang':'en','tag':'python'}
url_parts = list(urlparse.urlparse(url))
query = d...