mahmoud

# needs to be parted'd before replacing.
$ sudo parted /dev/disk/by-id/ata-HGST_HDN724030ALE640_PK2234P9K09E0Y
GNU Parted 3.2
Using /dev/sdh
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) mklabel GPT
(parted) quit

# then we need to make the ashift=9 because this is an older zfs pool
$ sudo zpool replace -o ashift=9 liu 18069869553946727791 /dev/disk/by-id/ata-HGST_HDN724030ALE640_PK2234P9K09E0Y

mahmoud

>>> class Lol:
...   pass
... 
>>> Lol()
<__main__.Lol instance at 0x7fb2bde403b0>
>>> x = Lol()
>>> x
<__main__.Lol instance at 0x7fb2bde403f8>
>>> x.__class__
<class __main__.Lol at 0x7fb2bde2ce88>

mahmoud

>>> z.gi_frame
<frame object at 0x7f21213b7548>
>>> z.__dict__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'generator' object has no attribute '__dict__'
>>> z.__slots__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'generator' object has no attribute '__slots__'

mahmoud

$ python example.py sum --help
Usage: cmd sum [FLAGS]

Just a lil fun in the sum


Flags: 

  --flagfile FLAGFILE                              (defaults to None)
  --help / -h  

mahmoud

URLs and IPs

The URL standard is one which builds on IP standards. Operating systems also build on IP standards. Believe it or not, the two diverge in some surprising ways!

Hyperlink aims to do some validation of IPs contained within URLs with IP hosts. URLs support a subset of IP syntax, as well as making affordances for future versions of IPs beyond IPv6 (no matter how unfathomable that may seem).

mahmoud

#!/usr/bin/env python
"""
./cut_mp4.py --input input.mp4 --start 00:00:01 --end 00:00:02 --no-align-keyframes --output output.mp4
"""

import os
import sys
import argparse
import datetime
import subprocess

mahmoud

DELETE FROM {table_name}
WHERE id = (
    SELECT id
    FROM {0}
    WHERE deliver_after <= now()
        AND q_name IN (SELECT unnest({q_names}))
    ORDER BY priority DESC, created_at
    FOR UPDATE SKIP LOCKED
    LIMIT 1
)

mahmoud

idna package notes:

• If a segment of a host (i.e., something in url.host.split('.')) is
  already ascii, idna doesn't perform its usual checks. For instance,
  capital letters are not valid idna2008. The package automatically lowercases.

You'll get something like:

mahmoud

Intro

urllib.unquote doesn't fit Python's paradigms so well:

unquote(u'%C3')
u'\xc3'
unquote('%C3')
'\xc3'

mahmoud

Code review notes

Mahmoud Hashemi, October 2017

git ref 03c67b7f015c7f939a2f8122583dee1b38e64a56

download_epa.sh

• could be ported python and perhaps parameterized (i.e., not hardcoding 2016 data)