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How do I change the working directory in Python?
... Never call os.chdir() outside of a context manager, unless you think you know what you're doing. (You probably don't.)
– Cecil Curry
May 22 '16 at 5:19
...
Difference between abstract class and interface in Python
...nd interface is a hairsplitting thing when you have duck typing. I don't know what "substantial" means. It's "real" -- it has substance -- from a design perspective. But from a language perspective there may be no support. You could adopt conventions to distinguish between an abstract class and ...
Alternatives to gprof [closed]
...s still a bottleneck, but program counter sampling will not see it because now the hotspot is in string-compare. On the other hand if it were to sample the extended program counter (the call stack), the point at which the string-compare is called, the sort loop, is clearly displayed. In fact, gprof ...
In Python, how can you load YAML mappings as OrderedDicts?
... pypy for some time (although considered CPython implementation detail for now).
Update: In python 3.7+, the insertion-order preservation nature of dict objects has been declared to be an official part of the Python language spec, see What's New In Python 3.7.
I like @James' solution for its simpl...
How to run functions in parallel?
... print(f'{seconds} has been processed')
secs_list = [2,4, 6, 8, 10, 12]
Now, if your operation is IO bound, then you can use the ThreadPoolExecutor as such:
with ThreadPoolExecutor() as executor:
results = executor.map(sleep_secs, secs_list)
Note how map is used here to map your function to ...
How to save all the variables in the current python session?
...
I know this answer is very old byt when I do this I have the following error: PicklingError: Can't pickle <built-in function raw_input>: it's not the same object as __builtin__.raw_input I just have 2 variables declared in...
how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
...rows and with mysql i can do this with only ONE query without any looping. Now I wonder if this is possible with postgresql too: to use just one query to bulk update OR insert. You say: "you're best of splitting it into two queries, one for INSERT and one for UPDATE" but how can I do an insert which...
Get model's fields in Django
...
Thank you Will. Good to know that other people are using _meta as well. I like the idea of having a wrapper function. Lazerscience, thank you also. Good to know there is a nice method to get the many_to_many fields. Joe
– Joe...
Can you add new statements to Python's syntax?
...pr test, stmt* body, stmt* orelse)
| Until(expr test, stmt* body)
If you now run make, notice that before compiling a bunch of files, Parser/asdl_c.py is run to generate C code from the AST definition file. This (like Grammar/Grammar) is another example of the Python source-code using a mini-langu...
How to update a record using sequelize for node?
... (project) {
project.update({
title: 'a very different title now'
})
.success(function () {})
}
})
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