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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.
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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...
Algorithm for classifying words for hangman difficulty levels as “Easy”,“Medium”, or “Hard”
...ttempt!)
4. Implementation
Here's an implementation of this algorithm in Python:
from collections import defaultdict
from string import ascii_lowercase
def partition(guess, words):
"""Apply the single letter 'guess' to the sequence 'words' and return
a dictionary mapping the pattern of o...