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How to duplicate sys.stdout to a log file?
...ess, os, sys
# Unbuffer output (this ensures the output is in the correct order)
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
tee = subprocess.Popen(["tee", "log.txt"], stdin=subprocess.PIPE)
os.dup2(tee.stdin.fileno(), sys.stdout.fileno())
os.dup2(tee.stdin.fileno(), sys.stderr.fileno())
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Why does Python code use len() function instead of a length method?
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len, str, etc. can be used with higher-order functions like map, reduce, and filter without the need to define a function or lambda just to call a method. Not everything revolves around OOP, even in Python.
– Evicatos
Nov 7 '...
What is __future__ in Python used for and how/when to use it, and how it works
...ith keyword was new and shouldn't be used as variable names any longer. In order to use with as a Python keyword in Python 2.5 or older, you will need to use the import from above.
Another example is
from __future__ import division
print 8/7 # prints 1.1428571428571428
print 8//7 # prints 1
Wit...
Print multiple arguments in Python
...(name, score))
Use new-style string formatting with numbers (useful for reordering or printing the same one multiple times):
print("Total score for {0} is {1}".format(name, score))
Use new-style string formatting with explicit names:
print("Total score for {n} is {s}".format(n=name, s=score))
C...
MD5 algorithm in Objective-C
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Best practices with STDIN in Ruby?
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I'll add that in order to use ARGF with parameters, you need to clear ARGV before calling ARGF.each. This is because ARGF will treat anything in ARGV as a filename and read lines from there first.
Here's an example 'tee' implementation:
Fil...
Why unsigned integer is not available in PostgreSQL?
...se PostgreSQL int4 or int8 respectively, just remembering that the natural order or arithmetic won't work reliably. But storing and retrieving is unaffected by that.
Here is how I can implement a simple unsigned int8:
First I will use
CREATE TYPE name (
INPUT = uint8_in,
OUTPUT = uint...
Backup/Restore a dockerized PostgreSQL database
...s a single db dump and not multiple db's i included the name)
However, in order to get this to work, I had to also go into the virtualenv that the docker container and project were in. This eluded me for a bit before figuring it out- as I was receiving the following docker error.
read unix @->...
Asynchronous Process inside a javascript for loop [duplicate]
.../rejected when the asynchronous operation is complete. Also, note that in order to use await, the containing function must be declared async.
Run asynchronous operations in parallel and use Promise.all() to collect results in order
function someFunction() {
let promises = [];
for (let ...
Determine Whether Two Date Ranges Overlap
...ndDates. Deriving this from above:
If start and end dates can be out of order, i.e., if it is possible that startA > endA or startB > endB, then you also have to check that they are in order, so that means you have to add two additional validity rules:
(StartA <= EndB) and (StartB <= ...