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kandi X-RAY | pycon Summary
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QUESTION
I am using windows 10, python 3.6
I am running a selenium project my code is
...ANSWER
Answered 2021-Jun-14 at 06:14Use Python New Version.
python 3.9 will be working in this case.
for more details you can read:
https://docs.python.org/3/library/contextlib.html#contextlib.asynccontextmanager
QUESTION
How to convert below python code into function , so that when i call and pass parameter the function process and run
Pyhton code :
...ANSWER
Answered 2021-Jun-10 at 03:28def pycon(path,sheet):
import pandas as pd
data_xls = pd.read_excel(path,sheet, dtype=str, index_col=None)
data_xls.to_csv('csvfile.csv', encoding='utf-8', index=False)
QUESTION
I'm currently developing, in Python, a very simple, stack-oriented programming language intended to introduce complete novices to programming concepts. The language does allow users to craft their own functions. While speed isn't a big concern for my language, I thought of creating a "simple" JIT compiler to generate Python byte code for the user's functions.
I was listening to an excellent talk from PyCon on how to hand-craft byte code and make functions from them. However, the speakers did add a caveat that the specific byte values of Python byte code are in no way portable and can even change between, say, 3.5.1 and 3.5.2.
So, I brought up the documentation for the dis
module and saw dis.opmap
, described as
Dictionary mapping operation names to bytecodes.
Therefore, if I wanted to put a BINARY_ADD
into a byte code object, I wouldn't need to know its specific value. I could just look it up in dis.opmap
.
This finally brings me to my question: Are there any other portability pitfalls of which I need to be aware (e.g., Endianness, sizes/numbers of arguments per opcode) in order to make my JIT compiler compatible with any version of Python 3? I imagine that there will be certain opcodes that were only made available in a specific version. However, as I mentally work out my JIT compiler, I can't see myself using anything but the most basic instructions.
...ANSWER
Answered 2021-May-19 at 01:33I am fairly certain that Python bytecode is undocumented. It's a messy place and it's a scary place. I'll offer an alternative at the end, but first.... why is it scary? First of all Python is interpreted to bytecode and that bytecode gets ran on a virtual machine. That virtual machine is definitely undocumented. You can take a look here at the opcode commit history. Notice that it changes... a lot. Beyond that you also have things like f-strings getting implemented which means the underlying C code is going to change. It's a very messy place because so many people are changing it.
Now, here is where my suggestion comes in. The reason that stuff is complicated is because many people are changing it. You daughter is 11 weeks, she ain't gonna be programming for at least another 3 weeks ;). So instead, why not make your own language? I recommend reading https://craftinginterpreters.com/contents.html. It's completely free and walks you through making an interpreted language in Java using AST followed by how to make a virtual machine with byte code and various chunk operations (just like Python has). It's a very easy to read book with good, thought-provoking questions at the end of chapters. You could make a completely customizable language that you ultimately control. Want to change an op code? Go for it. Want all users to be on the same playing field and guarantee backwards compatibility? It's your programming language, do whatever you want.
At the end of the day this is something that is going to be fun for you. And if you have to worry about opcodes being added or changed or overloaded, you're probably not going to be having fun. And when something eventually goes wrong you're going to have to debug your interpreted language, your JIT compiler and Python's source. That's just a headache in the making.
QUESTION
Whilst watching Raymond Hettinger's talk from PyCon 2018, Dataclasses: The code generator to end all code generators - PyCon 2018 an example of how dataclasses implement setattr and delattr on frozen dataclasses was provided:
...ANSWER
Answered 2021-May-17 at 19:58As @juanpa.arrivillaga pointed out in a comment, you can replicate the behavior using the built-in super()
function, however you don't need to pass it any arguments (in Python 3 at least).
Example:
QUESTION
I would like the modal that pops up in my code to work separately for the buttons I have. For example, I have the About Me
button and the Projects
button. When the user clicks the About Me
button, there should be a separate modal that pops up with different text, and then when the user clicks the Projects
button, there should be a different modal that pops up with a different text. Essentially, the design of the modal should be the same, it just that it should have different text for each of the buttons.
Code:
...ANSWER
Answered 2021-Feb-25 at 04:44There are multiples ways to reuse the same model with different content, based on the situation.
A simple solution can be passing some parameters to the popUp_model
function.
QUESTION
I have a Spark DataFrame that contains multiple columns with free text. Separately, I have a dictionary of regular expressions where each regex maps to a key.
For instance:
...ANSWER
Answered 2021-Jan-18 at 08:55Since you seem to only want to match exact words regex is way more expensive then just looking the words up. Assuming you only need to match whole words and not a complicated regular expression (e.g. numbers etc.) you can split the description into words and perform a lookup. If the words are saved in sets lookup will be O(1)
Code would look something like this
QUESTION
I'm struggling to understand this example from a PyCon talk (link to code example)
...ANSWER
Answered 2020-Nov-28 at 12:57All the threads run to completion. That's the point of the lesson. When multiple threads access the same variable simultaneously, you can get unexpected results.
I've modified the code slightly to print less distracting stuff and also a thread id. I think this should help clarify what is happening:
QUESTION
I am struggling to wrap my head around the asyncio library. I thought you could simply define the sections of your code you want to run asynchronous, but in all the examples I have seen, people tend to define their main function as asynchronous. Here is the code that I have written:
...ANSWER
Answered 2020-Nov-03 at 02:44Couple of important things:
- Python interpreter GIL, runs on a single-thread; so technically you arent really running things in parallel
- But the catch is, most I/O operations 'hog' resources while your CPU during these periods is still idle. Thats where libraries like
asyncio
comes to your rescue. - They try to ensure minimal CPU-idle-time, by running other tasks in your queue while major I/O operations are awaiting their results
In your case, update_posts()
doesnt really seem like an async method in an ideal sense; because this method is technically only used to figure out which posts are to be downloaded and written
And since we are already discussing about download and writing, you can notice that you can actually make them run as independent tasks so ensure minimal downtime.
Here is how I might approach this:
QUESTION
Hi Guys, I am trying to map the district shapefile into assembly constituencies. I have shape files for Both.Basically I have to map all the variables given at district level in census data to assembly constituency level. So I am following a pycon talk. Everything is working fine but I am getting error in get_intersection function.Error for that is
TopologicalError: The operation 'GEOSIntersection_r' could not be performed. Likely cause is invalidity of the geometry
.
I have tried to use both pygeos and rtree. There were some links which said that problem is in pygeos. So,I used rtree.But of no avail.Please help Thanks in advance.
Code tried by me is
...ANSWER
Answered 2020-Sep-18 at 21:45The error message tells you exactly what is going on. Some of your geometries are not valid, so you have to make them valid before doing your apply. The simple trick, which works in most of the cases is using buffer(0)
.
QUESTION
I am using the following functions to perform IRR-Calculations with Python:
...ANSWER
Answered 2020-Sep-08 at 16:36Scipy optimization functions are fallable to local minima. Change optimization method to something diferent, e.g. anderson
, and get what you expect to.
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