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How to check which locks are held on a table
...ock is still available, but deprecated, so it's now recommended to use the sys.dm_tran_locks view for this kind of thing. You can find an example of how to "roll your own" sp_lock function here.
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In Python script, how do I set PYTHONPATH?
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You don't set PYTHONPATH, you add entries to sys.path. It's a list of directories that should be searched for Python packages, so you can just append your directories to that list.
sys.path.append('/path/to/whatever')
In fact, sys.path is initialized by splitting the...
Remove and Replace Printed items [duplicate]
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sys.stdout.write("\033[K") to clear the previous print
– user2742371
Mar 9 '18 at 13:39
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py2exe - generate single executable file
...so that will explain some of the os.system calls i'm using.
First I tried converting all my images into bitmats and then all my data files into text strings.
but this caused the final exe to be very very large.
After googleing for a week i figured out how to alter py2exe script to meet my needs.
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logger configuration to log to file and print to stdout
...err, you just need to specify it to the StreamHandler constructor.
import sys
# ...
logging.getLogger().addHandler(logging.StreamHandler(sys.stdout))
You could also add a Formatter to it so all your log lines have a common header.
ie:
import logging
logFormatter = logging.Formatter("%(asctime)s...
How to calculate the number of occurrence of a given character in each row of a column of strings?
...ingr package provides the str_count function which seems to do what you're interested in
# Load your example data
q.data<-data.frame(number=1:3, string=c("greatgreat", "magic", "not"), stringsAsFactors = F)
library(stringr)
# Count the number of 'a's in each element of string
q.data$number.of.a...
Comparing two dataframes and getting the differences
... lists, to do it efficiently we should first order them then compare them (converting the list to sets/hashing would also be fast; both are an incredible improvement to the simple O(N^2) double comparison loop
Note: the following code produces the tables:
df1=pd.DataFrame({
'Date':['2013-11-24...
When to use os.name, sys.platform, or platform.system?
As far as I know, Python has 3 ways of finding out what operating system is running on:
5 Answers
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__getattr__ on a module
... them, and so the existing hack (a module replacing itself with a class in sys.modules at import time) should be no longer necessary.
In Python 3.7+, you just use the one obvious way. To customize attribute access on a module, define a __getattr__ function at the module level which should accept o...
How to fix “Attempted relative import in non-package” even with __init__.py
...hin the same package. There's no way to relatively import from "the whole system". I'm not even sure why you'd want to do this.
– BrenBarn
Jul 8 '13 at 17:46
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