The article is dense but goes way deeper than straightforward sys.argv[1:] handling: [WayBack] 10.6. Handling command-line arguments.
–jeroen
Archive for the ‘Python’ Category
For my link archive: Python – Handling command-line arguments
Posted by jpluimers on 2020/04/02
Posted in Development, Python, Scripting, Software Development | Leave a Comment »
Printing all DNS records using DNSPython in Python 3 · GitHub
Posted by jpluimers on 2020/03/31
Cool example, which requires dnspython and might need an update of the DNS record type list (maybe dnspython has that list built in?):
[WayBack] Printing all DNS records using DNSPython in Python 3 · GitHub
–jeroen
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GitHub – alexmojaki/birdseye: Quick, convenient, expression-centric, graphical Python debugger using the AST
Posted by jpluimers on 2020/03/26
This is soooo nice! [WayBack] GitHub – alexmojaki/birdseye: Quick, convenient, expression-centric, graphical Python debugger using the AST
It runs on localhost:7777
Via: [WayBack] Birdseye ist eine interessante Lösung, um detailliert nachzuvollziehen, was beim Aufruf von Python-Funktionen und der Abarbeitung von Schleifen geschieh… – Martin Vogel – Google+
–jeroen
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python – How do I install pip on macOS or OS X? – Stack Overflow
Posted by jpluimers on 2020/03/25
On Mac OS X with stock Python:
All you need to do is
sudo easy_install pip
After this, you might want to upgrade pip:
sudo pip install --upgrade pip
Source: [WayBack] python – How do I install pip on macOS or OS X? – Stack Overflow
You could go the homebrew way, but that means your system will have two Python installations usually causing a nightmare of path dependency orders. In addition, homebrew puts you on the wrong foot, so:
DO NOT DO THIS!
# brew install pip Error: No available formula with the name "pip" Homebrew provides pip via: `brew install python`. However you will then have two Pythons installed on your Mac, so alternatively you can install pip via the instructions at: https://pip.readthedocs.io/en/stable/installing/
–jeroen
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Practical Deep Learning for Coders 2018 · fast.ai
Posted by jpluimers on 2020/03/11
I’ve read this twice and need to re-read this a few times, so from my reading list then need to follow the course one day: Practical Deep Learning for Coders 2018 · fast.ai [WayBack].
… deep learning course based on Pytorch (and a new library we have built, called fastai), with the goal of allowing more students to be able to achieve world-class results with deep learning. … this course, Practical Deep Learning for Coders 2018 [WayBack], … The only prerequisites are a year of coding experience, and high school math (math required for understanding the material is introduced as required during the course).
Related: [WayBack] The Matrix Calculus You Need For Deep Learning – Terence Parr and Jeremy Howard
Via:
- [WayBack] Matrix Calculus for Deep Learning | Hacker News
- [WayBack] Practical Deep Learning for Coders + Matrix Calculus for Deep Learning Un curs gratuit Practical Deep Learning for Coders … – Adrian Marius Popa – Google+
who posted another link as well:
–jeroen
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GitHub – mgedmin/check-manifest: Tool to check the completeness of MANIFEST.in for Python packages
Posted by jpluimers on 2020/02/27
I will need thi sone day: [WayBack] GitHub – mgedmin/check-manifest: Tool to check the completeness of MANIFEST.in for Python packages
Are you a Python developer? Have you uploaded packages to the Python Package Index? Have you accidentally uploaded broken packages with some files missing? If so, check-manifest is for you.
Via: [WayBack] check-manifest: a tool to check the completeness of MANIFEST.in for Python packages – ThisIsWhyICode – Google+
–jeroen
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More great free Python books
Posted by jpluimers on 2020/02/20
A while ago I wrote about Until 20171201 you can get free access to “Automate the Boring Stuff with Python”?.
That book is still free. And these great books are too:
- [WayBack] Cracking Codes with Python
- [WayBack] Invent with Python
- [WayBack] Making Games with Python & Pygame
Via: [WayBack] Cracking Codes with Python by @AlSweigart teaches complete beginners how to program in Python. The book features the source code to several ciphers and … – ThisIsWhyICode – Google+
–jeroen
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Python – list transformation; string formatting – Stack Overflow
Posted by jpluimers on 2020/01/08
Sometimes simple examples are the best: [WayBack] Python – list transformation – Stack Overflow.
Interactive example (note you can run and save at repl.it in either [WayBack] Repl.it – Python 3 or [WayBack] Repl.it – Python 2; you can run but not save it at [WayBack] Welcome to Python.org: interactive Python shell):
# Links the documentation are Python 2, though everything works in Python 3 as well.
x = [1,2,3,4,5,11]
print("x: ", repr(x))
y = ['01','02','03','04','05','11']
print("y: ", repr(y))
# List comprehension https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions
# ... using `str.format()` (Python >= 2.6): https://docs.python.org/2/library/stdtypes.html#str.format and https://docs.python.org/2/library/string.html#formatstrings
y = ["{0:0>2}".format(v) for v in x]
print("y: ", repr(y))
# ... using the traditional `%` formatting operator (Python < 2.6): https://docs.python.org/2/library/stdtypes.html#string-formatting y = ["%02d" % v for v in x] print("y: ", repr(y)) # ... using the format()` function (Python >= 2.6): https://docs.python.org/2/library/functions.html#format and https://docs.python.org/2/library/string.html#formatstrings
# this omits the "{0:...}" ceremony from the positional #0 parameter
y = [format(v, "0>2") for v in x]
print("y: ", repr(y))
# Note that for new style format strings, the positional argument (to specify argument #0) is optional (Python >= 2.7) https://docs.python.org/2/library/string.html#formatstrings
y = ["{:0>2}".format(v) for v in x]
print("y: ", repr(y))
# Using `lambda`
# ... Python < 3 return a list y = map(lambda v: "%02d" %v, x) print("y: ", repr(y)) # ... Python >= 3 return a map object to iterate over https://stackoverflow.com/questions/1303347/getting-a-map-to-return-a-list-in-python-3-x/1303354#1303354
y = list(map(lambda v: "%02d" %v, x))
print("y: ", repr(y))
Output:
Python 3 Python 2
–jeroen
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python – Why does “return list.sort()” return None, not the list? – Stack Overflow
Posted by jpluimers on 2020/01/02
list.sortsorts the list in place, i.e. it doesn’t return a new list. Just write
newList.sort()
return newList
The above answer is goden as performing return list.sort() bytes me often, because Python is usually an environment using the functional approach.
Answer from [WayBack] python – Why does “return list.sort()” return None, not the list? – Stack Overflow
Background information:
- [WayBack] 5. Data Structures — Python 2.7.15 documentation:
list.sort()
list.sort(cmp=None, key=None, reverse=False)- Sort the items of the list in place (the arguments can be used for sort customization, see
sorted()for their explanation).
- [WayBack] 5. Data Structures — Python 3.7.1rc1 documentation:
list.sort()
list.sort(key=None, reverse=False)- Sort the items of the list in place (the arguments can be used for sort customization, see
sorted()for their explanation).
–jeroen
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Using a main check __main__ to call a main function in Python
Posted by jpluimers on 2020/01/01
[WayBack] __main__ — Top-level script environment — Python 3 documentation recommends code like this:
if __name__ == "__main__":
# execute only if run as a script
main()
This has many cool possibilities, including these that I like most as a beginning Python developer:
- having your
def main():function in a separate source file - allowing to
returnprematurely from yourmainfunction (you cannot do this from the main block) - allowing a file to distinguish if it is being loaded as a module, or as a main program
Related:
–jeroen
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The Wiert Corner - irregular stream of stuff 