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How do I execute inserts and updates in an Alembic upgrade script?
... the official documentation, because it allows the use of agnostic SQL and pythonic writing and is also self-contained. SQLAlchemy Core is the best of both worlds for migration scripts.
Here is an example of the concept:
from sqlalchemy.sql import table, column
from sqlalchemy import String
from a...
Django Setup Default Logging
... the root key of the logging configuration dictionary. I found this in the Python documentation:
root - this will be the configuration for the root logger. Processing of the configuration will be as for any logger, except that the propagate setting will not be applicable.
Here's the configurat...
What is the difference between bottom-up and top-down?
...
@coder000001: for python examples, you could google search for python memoization decorator; some languages will let you write a macro or code which encapsulates the memoization pattern. The memoization pattern is nothing more than "rather tha...
Change / Add syntax highlighting for a language in Sublime 2/3
...dard themes. While the JavaScript language definition isn't as thorough as Python's, for example, Neon still has a lot more diversity than some of the defaults like Monokai or Solarized.
I should note that I used @int3h's Better JavaScript language definition for this image instead of the one tha...
Is C++14 adding new keywords to C++?
...ax, break old code and proceed just with the evolved part of the language. Python kinda tries to do that
– Lorah Attkins
Dec 13 '14 at 8:32
...
Which characters need to be escaped when using Bash?
... a different language (where you presumably already know how to quote). In Python: subprocess.Popen(['bash', '-c', 'printf "%q\0" "$@"', '_', arbitrary_string], stdin=subprocess.PIPE, stdout=subprocess.PIPE).communicate() will give you a properly shell-quoted version of arbitrary_string.
...
Mutable vs immutable objects
...ich is why many large numerical packages, such as the Numpy Array class in Python, allow for In-Place updates of large arrays. This would be important for application areas that make use of large matrix and vector operations. This large data-parallel and computationally intensive problems achieve a...
Default function arguments in Rust
...me(4)), but with the macro pattern matching you cannot (this is similar to Python's default argument rules).
You could also use an "arguments" struct and the From/Into traits:
pub struct FooArgs {
a: f64,
b: i32,
}
impl Default for FooArgs {
fn default() -> Self {
FooArgs {...
How does the Brainfuck Hello World actually work?
... then prints(‘.’) character with that ascii value. i.e for example in python:
chr(70+2) # prints 'H'
>+.
moves to 2nd cell increment 1 to its value 100+1 and prints(‘.’) its value i.e chr(101)
chr(101) #prints ‘e’
now there is no > or < in next piece so it takes present valu...
SQLAlchemy: Creating vs. Reusing a Session
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Hi, @zzzeek. Thanks for excellent answer. I'm very new in python and several things I wanna clarify: 1) Do I understand correct when I create new "session" by calling Session() method it will create SQL Transaction, then transaction will be opened until I commit/rollback session? 2...