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Expression Versus Statement
...ction can iclude unless the language only allows for limited lambdas, like Python's single-expression lambdas.
In an expression-based language, all you need is a single expression for a function since all control structures return a value (a lot of them return NIL). There's no need for a return st...
One-line list comprehension: if-else variants
It's more about python list comprehension syntax. I've got a list comprehension that produces list of odd numbers of a given range:
...
How much faster is Redis than mongoDB?
... the following benchmark: 2x write, 3x read.
Here's a simple benchmark in python you can adapt to your purposes, I was looking at how well each would perform simply setting/retrieving values:
#!/usr/bin/env python2.7
import sys, time
from pymongo import Connection
import redis
# connect to redis ...
How to convert a NumPy array to PIL image applying matplotlib colormap
...
Not the answer you're looking for? Browse other questions tagged python numpy matplotlib python-imaging-library color-mapping or ask your own question.
How do I install from a local cache with pip?
...ng packages out to your deployment machines. It also still relies on pypi.python.org being reachable. Great for a local development cache, but not suitable for heavier uses.
– slacy
Sep 25 '12 at 18:35
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How to select rows from a DataFrame based on column values?
...>= A) & (df['column_name'] <= B)]
Note the parentheses. Due to Python's operator precedence rules, & binds more tightly than <= and >=. Thus, the parentheses in the last example are necessary. Without the parentheses
df['column_name'] >= A & df['column_name'] <= B
...
How do I install cygwin components from the command line?
...arate them with commas. e.g. in DOS, type setup-x86_64 --packages="openssh,python"
– Michael Scheper
Mar 19 '14 at 23:00
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Regex: Specify “space or start of string” and “space or end of string”
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for python, replace (?<=\s|^) with (?:(?<=\s)|(?<=^)). Otherwise, you get error: look-behind requires fixed-width pattern
– user2426679
Aug 31 '16 at 20:06
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Unique (non-repeating) random numbers in O(1)?
...roposed standard method to achieve this. I've experimented with some basic Python code which is based on the AES-FFX idea, although not fully conformant--see Python code here. It can e.g. encrypt a counter to a random-looking 7-digit decimal number, or a 16-bit number. Here is an example of radix 10...
How to see full symlink path
...t have either of the above installed, you can do the following if you have python 2.6 (or later) installed
python -c 'import os.path; print(os.path.realpath("symlinkName"))'
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