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What is the most compatible way to install python modules on a Mac?
...on25-apple
python26-apple
python27 (active)
python27-apple
python32
$ port select python python32
Add tox on top of it and your programs should be really portable
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How do I raise the same Exception with a custom message in Python?
...g the extra information under your own variable name. For both python2 and python3:
try:
try:
raise ValueError
except ValueError as err:
err.extra_info = "hello"
raise
except ValueError as e:
print(" error was "+ str(type(e))+str(e))
if 'extra_info' in dir(e):
...
Get exception description and stack trace which caused an exception, all as a string
...
There is a simpler Python3 way without using .__traceback__ and type, see stackoverflow.com/a/58764987/5717886
– don_vanchos
Nov 8 '19 at 11:18
...
Flattening a shallow list in Python [duplicate]
...
@JosepVallsm nice solution! for python3 you need to use str instead of basestring, The builtin basestring abstract type was removed. Use str instead. The str and bytes types don’t have functionality enough in common to warrant a shared base class. The 2to...
Select random lines from a file
...s what I regularly use so that's what I'll use to make this faster:
#!/bin/python3
import random
f = open("lines_78000000000.txt", "rt")
count = 0
while 1:
buffer = f.read(65536)
if not buffer: break
count += buffer.count('\n')
for i in range(10):
f.readline(random.randint(1, count))
This...
How to re-raise an exception in nested try/except blocks?
...
@user4815162342 Good point :) Though meanwhile in Python3 I'd consider raise from, so the stack trace would also let me se plan B failed. Which can be emulated in Python 2 by the way.
– Tobias Kienzler
Feb 4 '17 at 21:30
...
Multiprocessing vs Threading Python [duplicate]
...other Python inefficiencies coming into play.
Test code:
#!/usr/bin/env python3
import multiprocessing
import threading
import time
import sys
def cpu_func(result, niters):
'''
A useless CPU bound function.
'''
for i in range(niters):
result = (result * result * i + 2 * ...
How to convert an xml string to a dictionary?
...ing from a JSON/dict, you can use:
try:
basestring
except NameError: # python3
basestring = str
def dict_to_etree(d):
def _to_etree(d, root):
if not d:
pass
elif isinstance(d, basestring):
root.text = d
elif isinstance(d, dict):
...
`from … import` vs `import .` [duplicate]
...
You are using Python3 were urllib in the package. Both forms are acceptable and no one form of import is preferred over the other. Sometimes when there are multiple package directories involved you may to use the former from x.y.z.a import...
logger configuration to log to file and print to stdout
...output and is easily configurable (also available as Gist):
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# -------------------------------------------------------------------------------
# -
# Python dual-logging setup...