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Sorting a Python list by two fields
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Python has a stable sort, so provided that performance isn't an issue the simplest way is to sort it by field 2 and then sort it again by field 1.
That will give you the result you want, the only catch is that if it is a big...
Check free disk space for current partition in bash
... specify -k. (coreutils df defaults to 1k blocks, so you're pretty safe on Linux though - but if you have coreutils, you have stat, and that's even safer - no parsing required).
– Mat
Nov 13 '11 at 9:21
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Adding a Method to an Existing Object Instance
... add a method to an existing object (i.e., not in the class definition) in Python.
16 Answers
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How to determine SSL cert expiration date from a PEM encoded certificate?
If I have the actual file and a Bash shell in Mac or Linux, how can I query the cert file for when it will expire? Not a web site, but actually the certificate file itself, assuming I have the csr, key, pem and chain files.
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Python, remove all non-alphabet chars from string
I am writing a python MapReduce word count program. Problem is that there are many non-alphabet chars strewn about in the data, I have found this post Stripping everything but alphanumeric chars from a string in Python which shows a nice solution using regex, but I am not sure how to implement it
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What makes Lisp macros so special?
...(e.g. Infix Notation Math for Clojure).
Here is a more concrete example:Python has list comprehensions built into the language. This gives a simple syntax for a common case. The line
divisibleByTwo = [x for x in range(10) if x % 2 == 0]
yields a list containing all even numbers between 0 and ...
Web scraping with Python [closed]
...se/sunset times from a web site. Is it possible to scrape web content with Python? what are the modules used? Is there any tutorial available?
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builtins.TypeError: must be str, not bytes
I've converted my scripts from Python 2.7 to 3.2, and I have a bug.
2 Answers
2
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What's the difference between a Python “property” and “attribute”?
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Properties are a special kind of attribute. Basically, when Python encounters the following code:
spam = SomeObject()
print(spam.eggs)
it looks up eggs in spam, and then examines eggs to see if it has a __get__, __set__, or __delete__ method — if it does, it's a property. If...
Unix - copy contents of one directory to another [closed]
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Don't do this. Do "cp -rT src dest" on Linux, or "cp -R src/ dest" on BSD.
– xpusostomos
Aug 5 at 10:56
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