- Export charles-ssl-proxying-certificate.pem from Charles Proxy
REQUESTS_CA_BUNDLE=/path/to/charles-ssl-proxying-certificate.pem pipenv {cmd} {args}
Python Types for Union of String Literal and Other Type
I wanted to add a single special value to another type for a union type, something like this:
from typing import Literal UNMEASURED = "unmeasured" Unmeasured = Literal[UNMEASURED] Resource = int | Unmeasured notes: dict[Resource, str] = {1: "foo", 2: "bar", 3: "baz", UNMEASURED: "quux"} resources = [1, 2, 3] + [UNMEASURED] for resource in resources: print(notes[resource])
This works, but mypy complains: ‘error: Parameter 1 of Literal[…] is invalid [valid-type]’. So to make this pass mypy typechecking you have to repeat “unmeasured” as a literal. Even if you do that:
from typing import Literal UNMEASURED = "unmeasured" Unmeasured = Literal["unmeasured"] Resource = int | Unmeasured notes: dict[Resource, str] = {1: "foo", 2: "bar", 3: "baz", UNMEASURED: "quux"} resources = [1, 2, 3] + [UNMEASURED] for resource in resources: print(notes[resource])
mypy will complain: ‘Dict entry 3 has incompatible type “str”: “str”; expected “int | Literal[‘unmeasured’]”: “str” [dict-item]’ and also ‘Invalid index type “str | int” for “dict[int | Literal[‘unmeasured’], str]”; expected type “int | Literal[‘unmeasured’]” [index]’
Eventually I came up with:
from enum import Enum from typing import Literal class Aspect(Enum): UNMEASURED = "unmeasured" Resource = int | Aspect notes: dict[Resource, str] = {1: "foo", 2: "bar", 3: "baz", Aspect.UNMEASURED: "quux"} resources = [1, 2, 3] + [Aspect.UNMEASURED] for resource in resources: print(notes[resource])
which both produces the same result, and passes the typechecker. I don’t love the weird Enum hanging out on its own but it does at least put the magic string in one place only and pass. I wonder what would be better.
Automatially Activate venv When Found in Directory
# Function to activate virtualenv if present auto_activate_virtualenv() { if [ -f "bin/activate" ]; then source bin/activate fi } # Add the function to chpwd hooks add-zsh-hook chpwd auto_activate_virtualenv
How to indicate that a single file module is typed to mypy
You can’t. Repackage your module as the only module in a package.
mypy needs a py.typed in the package’s directory and if you have a single module at the top level of your repo there’s no way to get setuptools to package that in such a way that the wheel will contain the py.typed in a useful place.
Example of the changes needed: github.com/wheerd/multiset/pull/127/files
Remember the Milk Alfred Workflow
This uses rtm-cli
which you can install with npm
.
query=$1 logfile="/Users/bakert/u/scratch/rtm.log" rtm=/opt/homebrew/bin/rtm max_lines=1000 # Log the query echo "[$(date)] $query" >> "$logfile" # Ensure the logfile does not grow beyond $max_lines tail -n $max_lines "$logfile" > "$logfile.tmp" && mv "$logfile.tmp" "$logfile" # Send the task to Remember the Milk "$rtm" add $query if [ $? -ne 0 ]; then echo "SOMETHING WENT WRONG! Please check that rtm-cli is installed: npm install -g rtm-cli" else echo "[Added] $query" fi
Gmail Conversations Archiving Has Gotten Worse
assertRaises in table-driven tests
This is what I want to do but it fails passing None
to assertRaises
:
tests = [ (0, None), (1, None), (-1, TooFewException), (99, None), (100, TooManyException), ] for n, exc in tests: with self.assertRaises(exc): results = my_code(n) assert len(results) == n
Here’s a version of assertRaises
that will let you do that:
def assert_raises(self, exception: Type[Exception]): if exception: return self.assertRaises(exception) return contextlib.nullcontext()
Line Count
Number of lines in a (python + js) codebase:
#!/bin/zsh # This script counts the number of non-blank lines of code in a directory and its subdirectories # for Python and JavaScript code only # Set the directory to search for code files dir='.' # Count the number of non-blank lines of code for Python and JavaScript files num_lines=$(find "$dir" -type f \( -name '*.py' -or -name '*.js' \) -not -path '*venv*' -not -path '*node_modules*' -exec grep -he '^[^[:space:]]' {} + | awk 'NF{count++} END{print count}') echo "Number of non-blank lines of code: $num_lines"
Number of lines per-file in a (python + js) codebase:
#!/bin/zsh # This script counts the number of non-blank lines of code in a directory and its subdirectories # for Python and JavaScript code only # Set the directory to search for code files dir='.' # Count the number of non-blank lines of code for Python and JavaScript files num_lines=$(find "$dir" -type f \( -name '*.py' -or -name '*.js' \) -not -path '*venv*' -print0 | xargs -0 grep -cve '^[[:space:]]* ) echo "Number of non-blank lines of code: $num_lines"
The Surprising Behavior of urljoin
>>> from urllib.parse import urljoin >>> urljoin('http://example.com/', '1') 'http://example.com/1' >>> urljoin('http://example.com/', '2629:1828:4025') '2629:1828:4025'
Better not try to urljoin anything with a colon in it!
Queries on local so much faster than queries on server
I was encountering a situation where big aggregating queries that took seconds on local were taking minutes or even hours on prod. After trying about a million things this Stack Exchange post finally cleared things up.
Setting innodb_buffer_pool_size = 5G
in MariaDB’s configuration and restarting instantly changed the queries to taking seconds. The default is 128M which is … not useful 🙂