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argparse store false if unspecified
...t present.
The source for this behavior is succinct and clear: http://hg.python.org/cpython/file/2.7/Lib/argparse.py#l861
The argparse docs aren't clear on the subject, so I'll update them now: http://hg.python.org/cpython/rev/49677cc6d83a
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Is there an equivalent of 'which' on the Windows command line?
...) do @echo. %~$PATH:i
C:\WINDOWS\system32\cmd.exe
c:\> for %i in (python.exe) do @echo. %~$PATH:i
C:\Python25\python.exe
You don't need any extra tools and it's not limited to PATH since you can substitute any environment variable (in the path format, of course) that you wish to use....
What is the difference between ELF files and bin files?
...e
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf
ELF from wiki
http://en.wikipedia.org/wiki/Executable_and_Linkable_Format
ELF format is generally the default output of compiling.
if you use GNU tool chains, you can translate it to binary format by using objcopy, suc...
那些我印象深刻的建议和教诲 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...你点建议吧，通常来说，你给自己设定的目标都是自己能到达的顶点，甚至都达不到。你现在只希望按部就班去外企当个程序员，很可能就只能去国内企业当个程序员，这有什么意思？年轻人，还是要把目标设高一点。”
后来...
wget/curl large file from google drive
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I wrote a Python snippet that downloads a file from Google Drive, given a shareable link. It works, as of August 2017.
The snipped does not use gdrive, nor the Google Drive API. It uses the requests module.
When downloading large fi...
Can scrapy be used to scrape dynamic content from websites that are using AJAX?
I have recently been learning Python and am dipping my hand into building a web-scraper. It's nothing fancy at all; its only purpose is to get the data off of a betting website and have this data put into Excel.
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Representing and solving a maze given an image
...ple and standard, there should not be difficulties on implementing this in Python or whatever.
And here is the answer:
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How can I generate a diff for a single file between two branches in github
...Chrome browsers: https://chrome.google.com/webstore/detail/diff-tools-text-pdf-doc-o/lkcdojpmjehlniamnglpjlldkoonlomb
Open Diff Tools ( http://iblogbox.com/devtools/diff/ )
From GitHub go to the BEFORE commit, tag, or branch, open the file, then click on the Raw button to get the raw file view, se...
Plot logarithmic axes with matplotlib in python
...ou are simply using the unsophisticated API, like I often am (I use it in ipython a lot), then this is simply
yscale('log')
plot(...)
Hope this helps someone looking for a simple answer! :).
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Why not use exceptions as regular flow of control?
...f the most expensive operations in .NET.
However, some languages (notably Python) use exceptions as flow-control constructs. For example, iterators raise a StopIteration exception if there are no further items. Even standard language constructs (such as for) rely on this.
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