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Explaining Python's '__enter__' and '__exit__'
...he top of the file if you're on Python 2.5).
with DatabaseConnection() as mydbconn:
# do stuff
PEP343 -- The 'with' statement' has a nice writeup as well.
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How do I check whether a file exists without exceptions?
...pproach (backported to pathlib2 in Python 2.7):
from pathlib import Path
my_file = Path("/path/to/file")
if my_file.is_file():
# file exists
To check a directory, do:
if my_file.is_dir():
# directory exists
To check whether a Path object exists independently of whether is it a file or...
How to request Google to re-crawl my website? [closed]
...est Google to re-crawl a website? If possible, this shouldn't last months. My site is showing an old title in Google's search results. How can I show it with the correct title and description?
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Fast check for NaN in NumPy
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Ray's solution is good. However, on my machine it is about 2.5x faster to use numpy.sum in place of numpy.min:
In [13]: %timeit np.isnan(np.min(x))
1000 loops, best of 3: 244 us per loop
In [14]: %timeit np.isnan(np.sum(x))
10000 loops, best of 3: 97.3 us per...
How to fix SSL certificate error when running Npm on Windows?
...ued me for the longest time until after a lot of time on Google, I learned my proxy used NTLM authentication. HTTP basic authentication wasn't enough to satisfy whatever proxy my corporate overlords had installed. I resorted to using Cntlm on my local machine (unauthenticated), then had it handle th...
How to reload a clojure file in REPL
... that does smart reloading based on a dependency graph of the namespaces.
myapp.web=> (require '[clojure.tools.namespace.repl :refer [refresh]])
nil
myapp.web=> (refresh)
:reloading (myapp.web)
:ok
Unfortunately reloading a second time will fail if the namespace in which you referenced the ...
How to prevent auto-closing of console after the execution of batch file
...ript in it), so they could have modified the behavior. That doesn't change my goal. To keep the command window open so I can so the error message it types.
– Henrik Erlandsson
Oct 28 '16 at 7:28
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How do you write a migration to rename an ActiveRecord model and its table in Rails?
...'m terrible at naming and realize that there are a better set of names for my models in my Rails app. Is there any way to use a migration to rename a model and its corresponding table?
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Eclipse, where to change the current debug line background?
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Ok, now I found it myself (through major reverse engineering). It is in General\Editors\Text Editors\Annotations page. It's called "Debug Current Instruction Pointer"
s...
How comment a JSP expression?
...is visible in client machine (Browser source code) as a comment.
3. <% my code //my comment %>
Java Single line comment. Ignored by the Compiler.
Not visible in client machine (Browser source code).
4. <% my code /**
my comment **/
%>
Java Multi line co...