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List attributes of an object
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Note that this only works for user-defined classes, not for built-in or extension types.
– ivan_pozdeev
Oct 22 '17 at 7:48
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Flatten nested dictionaries, compressing keys
...me way you would flatten a nested list, you just have to do the extra work for iterating the dict by key/value, creating new keys for your new dictionary and creating the dictionary at final step.
import collections
def flatten(d, parent_key='', sep='_'):
items = []
for k, v in d.items():
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How to use filter, map, and reduce in Python 3
...e so it doesn’t need a list at all. Particularly tricky is map() invoked for the side effects of the function; the correct transformation is to use a regular for loop (since creating a list would just be wasteful).
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Builtins
[...]
Removed reduce(). Use functools.reduce() if you really nee...
Should a return statement be inside or outside a lock?
...the (highly subjective) law of local coding style... I prefer ReturnInside for simplicity, but I wouldn't get excited about either.
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From an array of objects, extract value of a property as array
... comments that were made on the originally accepted answer nearly a year before this answer was posted.
– Alnitak
Feb 10 '18 at 19:55
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Use logging print the output of pprint
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Use pprint.pformat to get a string, and then send it to your logging framework.
from pprint import pformat
ds = [{'hello': 'there'}]
logging.debug(pformat(ds))
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How to request Administrator access inside a batch file
I am trying to write a batch file for my users to run from their Vista machines with UAC. The file is re-writing their hosts file, so it needs to be run with Administrator permissions. I need to be able to send them an email with a link to the .bat file. The desired behavior is that when they rig...
How to implement a binary tree?
...ode.r)
def deleteTree(self):
# garbage collector will do this for us.
self.root = None
def printTree(self):
if self.root is not None:
self._printTree(self.root)
def _printTree(self, node):
if node is not None:
self._printTree(no...
Creating Threads in python
...ding import Thread
from time import sleep
def threaded_function(arg):
for i in range(arg):
print("running")
sleep(1)
if __name__ == "__main__":
thread = Thread(target = threaded_function, args = (10, ))
thread.start()
thread.join()
print("thread finished...exit...
How to find list of possible words from a letter matrix [Boggle Solver]
...pile('[' + alphabet + ']{3,}$', re.I).match
words = set(word.rstrip('\n') for word in open('words') if bogglable(word))
prefixes = set(word[:i] for word in words
for i in range(2, len(word)+1))
def solve():
for y, row in enumerate(grid):
for x, letter in enumerate(row):
...