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How to get the return value from a thread in python?
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In Python 3.2+, stdlib concurrent.futures module provides a higher level API to threading, including passing return values or exceptions from a worker thread back to the main thread:
import concurrent.futures
def foo(bar):
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What is the source code of the “this” module doing?
If you open a Python interpreter, and type "import this", as you know, it prints:
5 Answers
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How to create PDF files in Python [closed]
... this:
First, download the Windows installer and source
Then try this on Python command line:
from reportlab.pdfgen import canvas
from reportlab.lib.units import inch, cm
c = canvas.Canvas('ex.pdf')
c.drawImage('ar.jpg', 0, 0, 10*cm, 10*cm)
c.showPage()
c.save()
All I needed is to get a bunch...
How can I get dictionary key as variable directly in Python (not by searching from value)?
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in python 3.6: print (f"key: {key}, value: {mydictionary[key]}")
– JinSnow
Jan 24 '17 at 21:22
add a co...
Can I get JSON to load into an OrderedDict?
...d while parsing source, OrderedDict will be used to build up the resulting python value.
– SingleNegationElimination
Aug 22 '19 at 0:33
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sh...
ImportError: No module named Crypto.Cipher
When I try to run app.py (Python 3.3, PyCrypto 2.6) my virtualenv keeps returning the error listed above. My import statement is just from Crypto.Cipher import AES . I looked for duplicates and you might say that there are some, but I tried the solutions (although most are not even solutions) and n...
Dictionary vs Object - which is more efficient and why?
What is more efficient in Python in terms of memory usage and CPU consumption - Dictionary or Object?
8 Answers
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List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...ssibilities:
You can use the builtin list.copy() method (available since Python 3.3):
new_list = old_list.copy()
You can slice it:
new_list = old_list[:]
Alex Martelli's opinion (at least back in 2007) about this is, that it is a weird syntax and it does not make sense to use it ever. ;) (In...
How can I sort a dictionary by key?
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Standard Python dictionaries are unordered. Even if you sorted the (key,value) pairs, you wouldn't be able to store them in a dict in a way that would preserve the ordering.
The easiest way is to use OrderedDict, which remembers the ...
Best way to handle list.index(might-not-exist) in python?
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There is nothing "dirty" about using try-except clause. This is the pythonic way. ValueError will be raised by the .index method only, because it's the only code you have there!
To answer the comment:
In Python, easier to ask forgiveness than to get permission philosophy is well established,...