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Shortest distance between a point and a line segment
...to be (that's why I made this).
Implementation of theory by Paul Bourke.
Python:
def dist(x1, y1, x2, y2, x3, y3): # x3,y3 is the point
px = x2-x1
py = y2-y1
norm = px*px + py*py
u = ((x3 - x1) * px + (y3 - y1) * py) / float(norm)
if u > 1:
u = 1
elif u <...
How to check whether a pandas DataFrame is empty?
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In Python, try/except is cheap and if is expensive. Python is neither Java nor C; here it's Easier to Ask Forgiveness than Permission
– Nick Marinakis
Apr 14 at 1:26
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What does this square bracket and parenthesis bracket notation mean [first1,last1)?
... programming languages tends to be zero-based, such as C, C++, Javascript, Python, while other languages such as Mathematica, Fortran, Pascal are one-based.
These differences can lead to subtle fence post errors, aka, off-by-one bugs when implementing Mathematical algorithms such as for-loops.
...
How to read a .xlsx file using the pandas Library in iPython?
I want to read a .xlsx file using the Pandas Library of python and port the data to a postgreSQL table.
6 Answers
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Please explain some of Paul Graham's points on Lisp
...about language fundamentals. You wouldn't hear a similar claim of Java, C, Python, Perl, Haskell, etc. as a good beginner's project!
– Matt Curtis
Apr 26 '10 at 0:57
9
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MongoDB/NoSQL: Keeping Document Change History
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For users of Python (python 3+, and up of course) , there's HistoricalCollection that's an extension of pymongo's Collection object.
Example from the docs:
from historical_collection.historical import HistoricalCollection
from pymongo i...
Can I have an IF block in DOS batch file?
... msg * with any othe operation...
goto Continue1
)
:Continue1
If exist "C:\Python31" (
msg * 2nd line WORKS FINE rem You can relpace msg * with any othe operation...
goto Continue2
)
:Continue2
If exist "C:\Python31\Lib\site-packages\PyQt4" (
msg * 3th line WORKS FINE rem You can relpace msg *...
Why is exception handling bad?
...either culture-specific (maybe more of a problem in Java or C++ than, say, Python) or domain-specific.
– ddaa
Nov 16 '09 at 10:24
39
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What are the key differences between Apache Thrift, Google Protocol Buffers, MessagePack, ASN.1 and
...ited in terms of languages supported out of the box (it only supports C++, Python and Java) but it does have a lot of third-party support for other languages (of highly variable quality). Google does pretty much all of their work using Protocol Buffers, so it is a battle-tested, battle-hardened pro...
Best practice for Django project working directory structure
...usually edited by people, who doesn't care about project code
structure or python at all. If you are full-stack developer working alone or
in a small team, you can create per-app templates/static directory. It's really just a matter of taste.
The same applies for locale, although sometimes it's conv...