Here is a beautiful example of such an inconsistency!
My first Google search result
It is a great new feature provided by Google search.
I have used and learnt from it for my own Python programming a number of times. Often the tips are quite good for a non expert like me.
However, following is an obviously disappointing example I was shown yesterday.
What is missing or even wrong?
It is very strange and weird that Python is not capable out of the box to properly determine if an arbitrary value (a variable) is numeric, an integer, or a float!!!
Perhaps, there are other widely used and recognized packages (I strongly suspect e.g. NumPy) available to do that for you, but I think such fundamental functions should be part of the core of Python.
str(value).isnumeric() does not work properly when the value is a float. It returns false. It appears to work reliably only if the len(str(value)) = 1. What a joke! This is absolutely insane and unexpected!!!
isinstance(value, int) or isinstance(value, float) are similarly unreliable depending on whether the value is a string or not. I also tried int(str(value)) and float(str(value)).
isinstance(value, float) returns true when the value is clearly and typed (using the int() function) as an integer. This is absolutely insane and unexpected!!!!
isinstance(v, numbers.Number) also fails when the value is a str(value) even if the value is an integer, i.e. int(value) or a float, i.e. float(value). This is absolutely insane and unexpected!!!!
math.isnan(v) does not work with str(value) either! This is absolutely insane and unexpected!!!!
int(value) converts a float or a str(float) into an integer when the float decimals are less than .01. This is absolutely insane and unexpected!!!!
I found that str(value).isalpha() appears to work most reliably to determine that the value is a number and it does not crash!
Unlike str(value).isalnum() fails if the value is an clearly an single digit integer and nothing but an integer! It returns False if the value is a float, which is expected. The flaw here is that one character is enough for this function according to the documentation, while you would expect a minimum length requirement of two characters. This is absolutely insane and unexpected!!!!
In the end, I had to write my own functions to handle this ambiguity!
P.S. I probably wasted at least several hours to understand this issue and develop more reliable functions on my own! What a waste!
Caveat: I am not an expert in Python development.
I find it very strange that Python does not have a separate type for enum like set, tuple, or list (e.g. dataclasses are another kludge of this language).
To my surprise, I had to learn the hard way that Python enums are sensitive to the order of parent classes, when you use inheritance. This does not make any sense to me that the order of base classes matters.
I am using the PyCharm Community Edition IDE (version 2024.1.6 Build #PC-241.19072.16, built on August 8, 2024) and and Python version 3.12.
Caveat: I am not an expert Python developer
Anyway, today I wasted probably at least an hour to figure out following, to me cryptic error message from deep within Python:
"class Dummy2(StrEnum, DummyBase): File "/usr/lib64/python3.12/enum.py", line 606, in __new__ raise exc.with_traceback(tb)
File "/usr/lib64/python3.12/enum.py", line 596, in __new__
enum_class = super().__new__(metacls, cls, bases, classdict, **kwds)
TypeError: Cannot create a consistent method resolution order (MRO) for bases StrEnum, DummyBase"
Here is my compacted, simplified replication code for this error:
import os
from enum import StrEnum, unique
@unique
class DummyBase(StrEnum):
@classmethod
def dummy_method(cls):
return 'Here is a dummy'
@unique
class Dummy1(DummyBase, StrEnum):
M1 = 'Member1'
M2 = 'Member2'
@unique
class Dummy2(StrEnum, DummyBase):
M1 = 'Member1'
M2 = 'Member2'
def run():
os.system('clear')
print(Dummy1.dummy_method())
print(Dummy2.dummy_method())
Conclusion: Dummy1 works fine, but Dummy2 crashes! Grrr!
Google AI search also confirms that you can use inheritance on enums (see last sentence):
Apparently, it is not possible to inherit from an non-frozen class if you declare the derived class as frozen. That is weird and defeats the purpose!
At least the PyCharm Community Edition IDE flags it and would not allow it. Message: "Frozen dataclasses can not inherit non-frozen one and vice versa"
Why is the frozen option apparently not available at the field level?
It appears you can not use e.g. the __post_init__ to freeze the instance. Really bad. It seems you can also not use the typing.Final in the __post_init__.
Caveat: I am not an expert Python developer.
I recently started to use PyCharm instead of Visual Studio Code for my Python programming.
This CE of PyCharm has its shortcomings!
My project consists of two main sub folders and each mein sub folder has sub folders as well.
Here are my annoyances (will be amended as needed):
I have almost pulled out all my hairs using VSC for Python programming. So many things went wrong and often unexpectedly. My frustration got to the point to give up!
Situation: I program only for personal use on my laptop computer with Fedora Linux as the operating system and SQLite as my database application.
Then, it dawned on me perhaps this is not an not issues with the Python language, but with the IDE. Well, I just installed the PyCharm community edition. I have never before really used PyCharm.
The difference was like day and night! Indeed, VSC sucks when it comes to Python programming. The biggest issue I encountered was that if your packages were in different folder branches, VSC would fail to properly import local py files. I tried so many things to make the imports work, but to no avail. I probably wasted more than 24 hours total trying to fix these kind of issues.
Once I got busy in PyCharm basically all the issues I encountered with VSC went away with a few tiny corrections of my code (partially these lines of code were introduced trying to deal with the VSC failures). Within less than two hours my code was again running as it should be. 😊
The many charms of the PyCharm IDE compared to VSC:
I have started programming in Python only very recently! More annoyances will be added as I gain more experience with this language.
