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Reading GHC Core
Core is GHC's intermediate language. Reading Core can help you better understand the performance of your program. Someone asked me for documentation or tutorials on reading Core, but I couldn't find much.
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How to pipe input to a Bash while loop and preserve variables after loop ends
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The correct notation for Process Substitution is:
while read i; do echo $i; done < <(echo "$FILECONTENT")
The last value of i assigned in the loop is then available when the loop terminates.
An alternative is:
echo $FILECONTENT |
{
while read i; do echo $i; done
...do othe...
How to make good reproducible pandas examples
...o get some help on putting together these examples. People who are able to read these guides and come back with reproducible data will often have much better luck getting answers to their questions.
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Bash tool to get nth line from a file
... This is about 5 times slower than the tail / head combination when reading a file with 50M rows
– duhaime
Jun 4 '18 at 14:42
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show ...
I need to securely store a username and password in Python, what are my options?
...em Functions ###
def getSaltForKey(key):
return PBKDF2(key, saltSeed).read(SALT_SIZE) # Salt is generated as the hash of the key with it's own salt acting like a seed value
def encrypt(plaintext, salt):
''' Pad plaintext, then encrypt it with a new, randomly initialised cipher. Will not pr...
C fopen vs open
...tion.
That leaves the buffering question. In places where you are mainly reading or writing a file sequentially, the buffering support is really helpful and a big speed improvement. But it can lead to some interesting problems in which data does not end up in the file when you expect it to be the...
Why should I avoid using Properties in C#?
... particular point - I find properties make the client code much simpler to read than the equivalent method calls. I agree that developers need to know that properties are basically methods in disguise - but I think that educating developers about that is better than making code harder to read using ...
How does BitLocker affect performance? [closed]
...ton V100 64gb SSD the results are
Bitlocker off → on
Sequential read 243 MB/s → 140 MB/s
Sequential write 74.5 MB/s → 51 MB/s
Random read 176 MB/s → 100 MB/s
Random write, and the 4KB speeds are almost identical.
Clearly the processor is the bottleneck in this case....
How do I pass a string into subprocess.Popen (using the stdin argument)?
...).stdin
Warning Use communicate() rather than
stdin.write(), stdout.read() or
stderr.read() to avoid deadlocks due
to any of the other OS pipe buffers
filling up and blocking the child
process.
So your example could be written as follows:
from subprocess import Popen, PIPE, STDOUT
...
Is there a way to auto-adjust Excel column widths with pandas.ExcelWriter?
...ps someone :)
import pandas as pd
import sqlalchemy as sa
import urllib
read_server = 'serverName'
read_database = 'databaseName'
read_params = urllib.quote_plus("DRIVER={SQL Server};SERVER="+read_server+";DATABASE="+read_database+";TRUSTED_CONNECTION=Yes")
read_engine = sa.create_engine("mssql+...