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Writing a compiler in its own language
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Adding a curiosity to the previous answers.
Here's a quote from the Linux From Scratch manual, at the step where one starts building the GCC compiler from its source. (Linux From Scratch is a way to install Linux that is radically different from installing a distribution, in that you have to ...
NPM global install “cannot find module”
...ronment variable depends on your operating system. I'm using a flavour of Linux, so I used export NODE_PATH=... to set it in the local shell such that it is exported to commands run in that shell. To make the change persistent or available to all shells, put it in .profile or similar. The concept...
How to get all subsets of a set? (powerset)
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The Python itertools page has exactly a powerset recipe for this:
from itertools import chain, combinations
def powerset(iterable):
"powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)"
s = list(iterabl...
What does enumerate() mean?
What does for row_number, row in enumerate(cursor): do in Python?
5 Answers
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What is a mixin, and why are they useful?
In " Programming Python ", Mark Lutz mentions "mixins". I'm from a C/C++/C# background and I have not heard the term before. What is a mixin?
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Any way to properly pretty-print ordered dictionaries?
I like the pprint module in Python. I use it a lot for testing and debugging. I frequently use the width option to make sure the output fits nicely within my terminal window.
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Check if a Python list item contains a string inside another string
...bc-456'])
The test for iterable may not be the best. Got it from here: In Python, how do I determine if an object is iterable?
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How does Django's Meta class work?
...For latest version of Django: Django docs: Model Meta options
Metaclass in Python:
The best description is here: What are metaclasses in Python?
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Parsing boolean values with argparse
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nargs='?' means zero or one argument. docs.python.org/3/library/argparse.html#nargs
– Maxim
Aug 3 '17 at 12:05
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How to concatenate stdin and a string?
... Looks cool except -J doesn't seem to be standard/common. On Linux (where xargs is part of GNU findutils) I get the error: xargs: invalid option -- 'J' Which system is this on?
– arielf
Jul 21 '16 at 1:03
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