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How do I check if a variable exists?
...' intstead of myVar. If the variable name is not known when the code is written, it will be stored in a string variable at runtime, and the check I posted will also work.
– Ayman Hourieh
May 9 '09 at 13:46
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Why is “import *” bad?
It is recommended to not to use import * in Python.
12 Answers
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No Multiline Lambda in Python: Why not?
I've heard it said that multiline lambdas can't be added in Python because they would clash syntactically with the other syntax constructs in Python. I was thinking about this on the bus today and realized I couldn't think of a single Python construct that multiline lambdas clash with. Given that ...
How to get CRON to call in the correct PATHs
...rrect PATHs. When I run a Python script from shell the script runs fine as it uses the PATHs set in bashrc but when I use cron all the PATHs are not used from bashrc. Is there a file I can enter the PATHs into for cron like bashrc or a way to call the PATHs from bashrc?
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Is there any advantage of using map over unordered_map in case of trivial keys?
...lookup ( amortized O(1) vs. O(log n) ). Most times I use a map, I use either int or std::string as the key type; hence, I've got no problems with the definition of the hash function. The more I thought about it, the more I came to realize that I can't find any reason of using a std::map ov...
How to output numbers with leading zeros in JavaScript [duplicate]
I can round to x amount of decimal places with math.round but is there a way to round left of the decimal? for example 5 becomes 05 if I specify 2 places
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Is int[] a reference type or a value type?
...n array to a function to check something. Should I just pass the array, as it will just pass the reference of it, or should I pass it as ref?
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C++ STL Vectors: Get iterator from index?
... stl vector by index[], but now I need to copy just a chunk of the vector. It looks like vector.insert(pos, first, last) is the function I want... except I only have first and last as ints. Is there any nice way I can get an iterator to these values?
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How to prevent a background process from being stopped after closing SSH client in Linux
...ight, so I thought I could do that by starting the process in background (with an ampersand at the end of the command) and redirecting stdout to a file.
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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...st way to ensure only one instance of a given script is running - assuming it's Bash on Linux?
14 Answers
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