Examples for episodes 547 & 548

sample_code/ep547/README.md

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+# [shell vs environment variables (and env, export, etc.) (intermediate)](https://youtu.be/h36Xc38SDHg)
+
+Today we talk about environment variables, shell variables, shorthand(s) for setting them and unsetting them!
+
+## Interactive examples
+
+### Python
+
+```python
+import os
+'X' in os.environ
+```
+
+### Bash
+
+```bash
+NOSHOW=1 python3 -um scripts.swsh.da --pokemon da-targets --quiet
+
+X=1
+echo "$X"
+
+python3
+
+bash -c 'echo $X'
+echo $X
+
+export X
+bash -c 'echo $X'
+
+export X=2
+bash -c 'echo $X'
+
+export -n X
+bash -c 'echo $X'
+
+unset X
+echo $X
+
+X=1 bash -c 'echo $X'
+echo $X
+
+X=1 Y=1 Z= bash -c 'echo $X $Y $Z'
+
+man test
+
+which env
+
+env X=1 bash -c 'echo $X'
+env X=1 Y=1 bash -c 'echo $X $Y'
+
+env bash -c 'echo $USER'
+env -i bash -c 'echo $USER'
+```

sample_code/ep548/README.md

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+# [python 3.12 release highlights (beginner - advanced)](https://youtu.be/IV8OZY4194U)
+
+It's here!  with ugly new typing syntax and infinitely nestable fstrings and one of the funniest changes I've seen in a while -- python 3.12!
+
+## Interactive examples
+
+### Python
+
+```python
+import calendar
+calendar.January
+calendar.February
+calendar.March
+
+hi = 3
+f'hi{f'{hi}'}'
+
+f'hi{
+3
+}'
+
+f'hi{
+  3  # hi
+}'
+
+Old = int
+isinstance(5, Old)
+
+type Newest = int
+isinstance(5, Newest)
+Newest.__value__
+
+import dis
+
+def f():
+    x = [i * 2 for i in range(5)]
+    return x
+
+dis.dis(f)
+
+'\d'
+r'\d'
+'\\d'
+
+it = [1, 2, 3, 4, 5, 6, 7, 8, 9]
+
+import itertools
+
+for a, b, c in itertools.batched(it, 3):
+    print(a, b, c)
+
+for a, b in itertools.batched(it, 2):
+    print(a, b)
+
+sys.version_info
+
+class C:
+    def __init__(self):
+        self.x = 1
+    def f(self):
+        x
+
+C().f()
+
+import Counter from collections
+
+from collections import counter
+```
+
+### Python debugger (pdb)
+
+```
+$x = 1
+import token
+$token = token
+$token
+
+y = 1
+c
+y
+
+q
+```
+
+### Bash
+
+```bash
+python3.11
+python3.12
+python3.12 -m pydoc tokenize
+
+cd pre-commit/
+best-of -n 5 python3.11 t.py $(git ls-files -- '*.py')
+best-of -n 5 python3.12 t.py $(git ls-files -- '*.py')
+
+python3.11 -m tokenize /dev/stdin <<< 'f"hello {world}"'
+python3.12 -m tokenize /dev/stdin <<< 'f"hello {world}"'
+python3.12 -m tokenize /dev/stdin <<< 'f"{a}({world})"'
+
+python3.12 -m venv vvv
+sudo apt install python3.12-venv
+
+virtualenv venv -ppython3.12
+./venv/bin/pip freeze --all
+./venv/bin/pip install setuptools
+./venv/bin/python3 -c 'import distutils'
+
+. venv/bin/activate
+pip install pycodestyle
+pycodestyle t4.py
+
+pip install pyupgrade
+cat t4.py
+
+pyupgrade t4.py
+cat t4.py
+
+cd pyflakes
+deactivate
+
+python3.12 -m unittest discover pyflakes
+python3.12 -m unittest discover pyflakes --duration 5
+python3.12 -m unittest discover pyflakes --duration 10
+```

sample_code/ep548/rev01/t.py

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+import sys
+import tokenize
+
+
+def main() -> int:
+    for fname in sys.argv[1:]:
+        with open(fname) as f:
+            for _ in tokenize.generate_tokens(f.readline):
+                pass
+    return 0
+
+
+if __name__ == '__main__':
+    raise SystemExit(main())

sample_code/ep548/rev02/t.py

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+from typing import TypeVar
+
+T = TypeVar('T')
+
+
+def f(x: T) -> list[T]:
+    return [x]

sample_code/ep548/rev03/t.py

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+from typing import TypeVar
+
+Z = TypeVar('Z', bound=int)
+
+
+def f[T: C, U, V](x: T) -> list[T]:
+    return [x]
+
+
+async g[T](): ...
+
+class D[T]: pass
+
+class C: pass
+
+Old = int
+
+from typing import TypeAlias
+
+Newer: TypeAlias = "Foo"
+
+type Newest = int
+
+type NewestWithGeneric[T: int] = list[T]

sample_code/ep548/rev03/t2.py

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+from typing import Any
+
+
+def f(**kwargs: dict[str, Any]): pass
+
+
+# not ok f(x=1, y=2)
+# ok f(x={}, y={})

sample_code/ep548/rev04/t2.py

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+from typing import TypedDict, Unpack
+
+
+class D(TypedDict):
+    x: int
+    y: str
+
+
+def f(**kwargs: Unpack[D]): pass
+
+
+f(x=1, y='foo')

sample_code/ep548/rev04/t3.py

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+
+
+class C:
+    def frob(self):
+        print('default')
+
+    def do_work(self):
+        self.frob()
+
+
+class D(C):
+    def frob(self):
+        print('something else')
+
+
+D().do_work()

sample_code/ep548/rev05/t3.py

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+from typing import override
+
+
+class C:
+    def new_frob(self):
+        print('default')
+
+    def do_work(self):
+        self.new_frob()
+
+
+class D(C):
+    @override
+    def frob(self):
+        print('something else')
+
+
+D().do_work()

sample_code/ep548/rev05/t4.py

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+x = '\d'

setup.cfg

@@ -49,3 +49,5 @@ per-file-ignores =
     */ep439/*/t.py:F821
     */ep496/*/t.py:F401
     */ep546/rev01/t.py:E999
+    */ep548/rev03/t.py:E999
+    */ep548/rev05/t4.py:W605