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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...
Python __str__ and lists
...l automatically call the toString() method on each object inside the List. For example, if my list contains objects o1, o2, and o3, list.toString() would look something like this:
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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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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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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...
Use logging print the output of pprint
...
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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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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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):
...
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...