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How do you detect where two line segments intersect? [closed]
...q + s. Then any point on the first line is representable as p + t r (for a scalar parameter t) and any point on the second line as q + u s (for a scalar parameter u).
The two lines intersect if we can find t and u such that:
p + t r = q + u s
Cross both sides with s, getting
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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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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...
How do I get a Cron like scheduler in Python? [closed]
I'm looking for a library in Python which will provide at and cron like functionality.
9 Answers
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How can I make a time delay in Python? [duplicate]
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import time
time.sleep(5) # Delays for 5 seconds. You can also use a float value.
Here is another example where something is run approximately once a minute:
import time
while True:
print("This prints once a minute.")
time.sleep(60) # Delay for 1 mi...
Pickle or json?
...rements (e.g. you are just going to use the data with Python) and a binary format is fine, go with cPickle which gives you really fast Python object serialization.
If you want interoperability or you want a text format to store your data, go with JSON (or some other appropriate format depending on ...
What's the difference between a Python “property” and “attribute”?
...f it is a property, instead of just returning the eggs object (as it would for any other attribute) it will call the __get__ method (since we were doing lookup) and return whatever that method returns.
More information about Python's data model and descriptors.
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How to access the ith column of a NumPy multidimensional array?
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+1 for specifying [:,[0]] vs [:,0] to get a column vector rather than a row vector. Exactly the behavior I was looking for. Also +1 to lib for the additional indexing note. This answer should be right up there with the top ans...
What is the best way to compute trending topics or tags?
...any sites offer some statistics like "The hottest topics in the last 24h". For example, Topix.com shows this in its section "News Trends". There, you can see the topics which have the fastest growing number of mentions.
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Odd behavior when Java converts int to byte?
...t afterwards. The resulting number is the positive version of that number
For example: 11111111 goes to 00000001 = -1. This is what Java will display as the value.
What you probably want to do is know the unsigned value of the byte.
You can accomplish this with a bitmask that deletes everything b...