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Create a “with” block on several context managers? [duplicate]
Suppose you have three objects you acquire via context manager, for instance A lock, a db connection and an ip socket.
You can acquire them by:
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What's the correct way to convert bytes to a hex string in Python 3?
What's the correct way to convert bytes to a hex string in Python 3?
9 Answers
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String difference in Bash
I'm trying to find a way to determine the difference between two strings in my script. I could easily do this with diff or comm, but I'm not dealing with files and I'd prefer not to output them to files, do the compare and read it back.
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How do you get the list of targets in a makefile?
I've used rake a bit (a Ruby make program), and it has an option to get a list of all the available targets, eg
20 Answers
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Extract substring in Bash
...5_moreleters.ext , I want to extract the 5 digits and put them into a variable.
22 Answers
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How can I add new keys to a dictionary?
Is it possible to add a key to a Python dictionary after it has been created?
16 Answers
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How do I spool to a CSV formatted file using SQLPLUS?
...ited Apr 18 at 1:01
Daniel C. Sobral
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answered Feb 14 '17 at 21:55
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How do I concatenate two lists in Python?
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You can use the + operator to combine them:
listone = [1,2,3]
listtwo = [4,5,6]
joinedlist = listone + listtwo
Output:
>>> joinedlist
[1,2,3,4,5,6]
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SQL JOIN and different types of JOINs
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TylerH
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answered Nov 30 '13 at 9:34
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Replace all 0 values to NA
...a dataframe with some numeric columns. Some row has a 0 value which should be considered as null in statistical analysis. What is the fastest way to replace all the 0 value to NULL in R?
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