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Why do people say that Ruby is slow? [closed]
... get some numbers at the Computer Language Benchmarks Game:
Ruby 1.9 vs. Python3 within the same order of magnitude
Ruby 1.9 vs. PHP within the same order of magnitude
Ruby 1.9 vs. Java 6 server up to two orders of magnitude slower!
Ruby 1.9 vs. C (gcc) up to two orders of magnitude slower!
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Accessing dict keys like an attribute?
...ed and another one in __dict__
Causes a memory leak in Python < 2.7.4 / Python3 < 3.2.3
Pylint goes bananas with E1123(unexpected-keyword-arg) and E1103(maybe-no-member)
For the uninitiated it seems like pure magic.
A short explanation on how this works
All python objects internally store th...
How to save traceback / sys.exc_info() values in a variable?
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For Python3, exc_tuple[1] (aka value) is the instance of the exception, not the "String passed as parameter". See: docs.python.org/3/library/sys.html#sys.exc_info
– Jinghao Shi
Oct 6 '18 at ...
Is there an equivalent to CTRL+C in IPython Notebook in Firefox to break cells that are running?
...jupyter kernel using the jupyter api. This script was tested on MACOS with python3 and requires jupyter notebook, requests, json and psutil.
Put the script in your home directory and then usage looks like:
python ~/interrupt_bad_kernels.py
Interrupt kernel chews cpu.ipynb; PID: 57588; CPU: 2.3%? (...
Catch a thread's exception in the caller thread in Python
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to add an except else around your work thread
Source:
#!/usr/bin/env python3
import concurrent.futures
import time
def func_that_raises(do_raise):
for i in range(3):
print(i)
time.sleep(0.1)
if do_raise:
raise Exception()
for i in range(3):
print(i...
TCP: can two different sockets share a port?
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As expected, the output is blank. Now let's start a web server:
sudo python3 -m http.server 500
Now, here is the output of running netstat again:
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:500 0.0.0.0:* ...
Dictionary vs Object - which is more efficient and why?
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Is this still the case with recent versions of python3, 11 years later?
– matanster
May 22 at 19:41
add a comment
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How can I use threading in Python?
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For python3, replace 'import urllib2' with 'import urllib.request as urllib2'. and put parentheses in the print statement.
– Harvey
Sep 21 '13 at 1:50
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List comprehension rebinds names even after scope of comprehension. Is this right?
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In python3 while in list comprehension the variable is not getting change after it's scope over but when we use simple for-loop the variable is getting reassigned out of scope.
i = 1
print(i)
print([i in range(5)])
print(i)
Val...
Running shell command and capturing the output
...the (return_value, output).
For a solution that works in both Python2 and Python3, use the subprocess module instead:
from subprocess import Popen, PIPE
output = Popen(["date"],stdout=PIPE)
response = output.communicate()
print response
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