Tom Faulkner TomFaulkner

## beautiful_idiomatic_python.md

      
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                TomFaulkner
                / beautiful_idiomatic_python.md
            
            
              Created
              April 26, 2017 05:09
                — forked from mongoose11235813/beautiful_idiomatic_python.md
            
              
                Transforming Code into Beautiful, Idiomatic Python: notes from Raymond Hettinger's talk at pycon US 2013. The code examples and direct quotes are all from Raymond's talk. I've reproduced them here for my own edification and the hopes that others will find them as handy as I have!
              
          
    Transforming Code into Beautiful, Idiomatic Python

Notes from Raymond Hettinger's talk at pycon US 2013 video, slides.
The code examples and direct quotes are all from Raymond's talk. I've reproduced them here for my own edification and the hopes that others will find them as handy as I have!
Looping over a range of numbers

for i in [0, 1, 2, 3, 4, 5]:

  
## filtering.py
"""
Function to filter a string using an optional exact match whitelist (include),
 optional whitelist using regex (include_regex),
 exact match blacklist (exclude), and blacklist regex (exclude_regex)

See unittest below for usage examples

Code is from https://github.com/TomFaulkner/pypihole/blob/master/pypihole/helpers/filtering.py,
 check there for updates
"""

## gist:eec96ed8b55b9e901df0e4fea2f69505
### Keybase proof

I hereby claim:

  * I am tomfaulkner on github.
  * I am tomfaulkner (https://keybase.io/tomfaulkner) on keybase.
  * I have a public key ASC4oGzsjuO8XVLPSyBWTYJemCFTjO4q91585EtPyS1KRwo

To claim this, I am signing this object:

## background_loop.py
"""Background Loop for running a monitor process

Uses a daemon thread, so no delays in exiting.
Don't use this for things that involve writing data, as weird things
may happen if the daemon dies while writing.

Pass in an a function to call as "action"

This does what I need it for at the moment, for other uses one might
need to extend the action call to pass on parameters or *args, **kwargs.

## AutoVivication.py
# Borrowed from:
# https://stackoverflow.com/questions/2600790/multiple-levels-of-collection-defaultdict-in-python
class AutoVivification(dict):
    """Implementation of perl's autovivification feature."""
    def __getitem__(self, item):
        try:
            return dict.__getitem__(self, item)
        except KeyError:
            value = self[item] = type(self)()
            return value

## find-duplicate-files.bash
find -type f -size +3M -print0 | while IFS= read -r -d '' i; do
  #echo $i
  echo -n '.'
  if grep -q "$i" md5-partial.txt; then
    echo -n ':'; #-e "\n$i  ---- Already counted, skipping.";
    continue;
  fi
  #md5sum "$i" >> md5.txt
  MD5=`dd bs=1M count=1 if="$i" status=none | md5sum`
  MD5=`echo $MD5 | cut -d' ' -f1`

## guuid.py
import sys
from uuid import uuid4


def make(number):
    for _ in range(number):
        print(str(uuid4()))


if __name__ == '__main__':

## dynamo_upgrade.py
import logging


LOGGER = logging.getLogger(__name__)


class SchemaUpgradeException(Exception):
    """"""


## gist:5ef080c7b36fc8d8d3358667eb82c403
# spread
# Author:- Rohit Tanwar
# https://github.com/kriadmin/30-seconds-of-python-code
# Contributors:-Rohit Tanwar

# Implements javascript's [].concat(...arr). Flattens the list(non-deep) and returns an list.

def spread(arg):
    ret = []
    for i in arg:

## extendable_enum.py
"""An extendable Enum

Though this one is probably better:
https://pypi.python.org/pypi/aenum
"""

from enum import Enum

class ExtendableEnum(Enum):
    @classmethod
	"""
	Function to filter a string using an optional exact match whitelist (include),
	optional whitelist using regex (include_regex),
	exact match blacklist (exclude), and blacklist regex (exclude_regex)

	See unittest below for usage examples

	Code is from https://github.com/TomFaulkner/pypihole/blob/master/pypihole/helpers/filtering.py,
	check there for updates
	"""
	### Keybase proof

	I hereby claim:

	* I am tomfaulkner on github.
	* I am tomfaulkner (https://keybase.io/tomfaulkner) on keybase.
	* I have a public key ASC4oGzsjuO8XVLPSyBWTYJemCFTjO4q91585EtPyS1KRwo

	To claim this, I am signing this object:
	"""Background Loop for running a monitor process

	Uses a daemon thread, so no delays in exiting.
	Don't use this for things that involve writing data, as weird things
	may happen if the daemon dies while writing.

	Pass in an a function to call as "action"

	This does what I need it for at the moment, for other uses one might
	need to extend the action call to pass on parameters or args, *kwargs.
	# Borrowed from:
	# https://stackoverflow.com/questions/2600790/multiple-levels-of-collection-defaultdict-in-python
	class AutoVivification(dict):
	"""Implementation of perl's autovivification feature."""
	def __getitem__(self, item):
	try:
	return dict.__getitem__(self, item)
	except KeyError:
	value = self[item] = type(self)()
	return value
	find -type f -size +3M -print0 \| while IFS= read -r -d '' i; do
	#echo $i
	echo -n '.'
	if grep -q "$i" md5-partial.txt; then
	echo -n ':'; #-e "\n$i ---- Already counted, skipping.";
	continue;
	fi
	#md5sum "$i" >> md5.txt
	MD5=`dd bs=1M count=1 if="$i" status=none \| md5sum`
	MD5=`echo $MD5 \| cut -d' ' -f1`
	import sys
	from uuid import uuid4


	def make(number):
	for _ in range(number):
	print(str(uuid4()))


	if __name__ == '__main__':
	import logging


	LOGGER = logging.getLogger(__name__)


	class SchemaUpgradeException(Exception):
	""""""
	# spread
	# Author:- Rohit Tanwar
	# https://github.com/kriadmin/30-seconds-of-python-code
	# Contributors:-Rohit Tanwar

	# Implements javascript's [].concat(...arr). Flattens the list(non-deep) and returns an list.

	def spread(arg):
	ret = []
	for i in arg:
	"""An extendable Enum

	Though this one is probably better:
	https://pypi.python.org/pypi/aenum
	"""

	from enum import Enum

	class ExtendableEnum(Enum):
	@classmethod