Does asyncio supports asynchronous I/O for file operations?
Most operating systems don’t support asynchronous file operations. That’s why asyncio doesn’t support them either. See the asyncio wiki for further explanation.
python
“OverflowError: Python int too large to convert to C long” on windows but not mac
You’ll get that error once your numbers are greater than sys.maxsize: >>> p = [sys.maxsize] >>> preds[0] = p >>> p = [sys.maxsize+1] >>> preds[0] = p Traceback (most recent call last): File “<stdin>”, line 1, in <module> OverflowError: Python int too large to convert to C long You can confirm this by checking: >>> …
When using pathlib, getting error: TypeError: invalid file: PosixPath(‘example.txt’)
pathlib integrates seemlessly with open only in Python 3.6 and later. From Python 3.6’s release notes: The built-in open() function has been updated to accept os.PathLike objects, as have all relevant functions in the os and os.path modules, and most other functions and classes in the standard library. To get it to work in Python …
Catch all routes for Flask [duplicate]
You can follow this guideline: https://flask.palletsprojects.com/en/1.1.x/api/#url-route-registrations from flask import Flask app = Flask(__name__) @app.route(“https://stackoverflow.com/”, defaults={‘path’: ”}) @app.route(‘/<path:path>’) def catch_all(path): return ‘You want path: %s’ % path if __name__ == ‘__main__’: app.run()
Can I get an item from a PriorityQueue without removing it yet?
If a is a PriorityQueue object, You can use a.queue[0] to get the next item: from queue import PriorityQueue a = PriorityQueue() a.put((10, “a”)) a.put((4, “b”)) a.put((3,”c”)) print(a.queue[0]) print(a.queue) print(a.get()) print(a.queue) print(a.get()) print(a.queue) output is : (3, ‘c’) [(3, ‘c’), (10, ‘a’), (4, ‘b’)] (3, ‘c’) [(4, ‘b’), (10, ‘a’)] (4, ‘b’) [(10, ‘a’)] but …
TypeError: expected a character buffer object – while trying to save integer to textfile
Have you checked the docstring of write()? It says: write(str) -> None. Write string str to file. Note that due to buffering, flush() or close() may be needed before the file on disk reflects the data written. So you need to convert y to str first. Also note that the string will be written at …
Can you migrate backwards to before the first migration in South?
./manage.py migrate myapp zero See: https://docs.djangoproject.com/en/1.9/ref/django-admin/#migrate In Django 1.11: https://docs.djangoproject.com/en/1.11/ref/django-admin/#migrate
Using print() (the function version) in Python2.x
Consider the following expressions: a = (“Hello SO!”) a = “Hello SO!” They’re equivalent. In the same way, with a statement: statement_keyword(“foo”) statement_keyword “foo” are also equivalent. Notice that if you change your print function to: print(“Hello”,”SO!”) You’ll notice a difference between python 2 and python 3. With python 2, the (…,…) is interpteted as …
Is i = i + n truly the same as i += n? [duplicate]
They don’t have to be the same. Using the + operator calls the method __add__ while using the += operator calls __iadd__. It is completely up to the object in question what happens when one of these methods is called. If you use x += y but x does not provide an __iadd__ method (or …
How to get the current Python interpreter path from inside a Python script? [duplicate]
The name of the interpreter is stored in the variable sys.executable