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How to split a delimited string in Ruby and convert it to an array?
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>> "1,2,3,4".split(",")
=> ["1", "2", "3", "4"]
Or for integers:
>> "1,2,3,4".split(",").map { |s| s.to_i }
=> [1, 2, 3, 4]
Or for later versions of ruby (>= 1.9 - as pointed out by Alex):
>> "1,2,3,4".split(",").map(&:to_i)
=> [1, 2, 3, 4]
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What does -1 mean in numpy reshape?
A numpy matrix can be reshaped into a vector using reshape function with parameter -1. But I don't know what -1 means here.
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unix domain socket VS named pipes?
...but thats the only thing i notice. Both use the C write/read function and work alike AFAIK.
2 Answers
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What is dynamic programming? [closed]
... future problem easier.
A good example is solving the Fibonacci sequence for n=1,000,002.
This will be a very long process, but what if I give you the results for n=1,000,000 and n=1,000,001? Suddenly the problem just became more manageable.
Dynamic programming is used a lot in string problems, s...
Final arguments in interface methods - what's the point?
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It doesn't seem like there's any point to it. According to the Java Language Specification 4.12.4:
Declaring a variable final can serve
as useful documentation that its value
will not change and can help avoid
programming errors.
However, a final modifier on a m...
Best way to represent a Grid or Table in AngularJS with Bootstrap 3? [closed]
...w a table/grid with thousands of rows. What is the best available control for AngularJS & Bootstrap with features like Sorting, Searching, Pagination etc.
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Get size of folder or file
How can I retrieve size of folder or file in Java?
18 Answers
18
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Convert list to tuple in Python
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It should work fine. Don't use tuple, list or other special names as a variable name. It's probably what's causing your problem.
>>> l = [4,5,6]
>>> tuple(l)
(4, 5, 6)
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are there dictionaries in javascript like python?
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};
And to access the values:
states_dictionary.AK[0] //which is liza
or you can use javascript literal object notation, whereby the keys not require to be in quotes:
states_dictionary={
CT:["alex","harry"],
AK:["liza","alex"],
TX:["fred", "harry"]
};
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How to convert a file into a dictionary?
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d = {}
with open("file.txt") as f:
for line in f:
(key, val) = line.split()
d[int(key)] = val
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