I want to convert python codes to java. But I do not understand slicing step parameter.
Example:
x = "Hello World !"
x[6:2:-1]
And what is the result x[6:2:-1] ?
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-3
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7Why don't you execute it and see? – Rohit Jain Sep 19 '13 at 18:39
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I do not installed python libraries etc... – N3CAT1 Sep 19 '13 at 18:40
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http://stackoverflow.com/a/509295/ – flornquake Sep 19 '13 at 18:40
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Have you tried reading the manual? – JJJ Sep 19 '13 at 18:40
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Instead of converting your python code to java, why don't you host it in jython? You'll save yourself a lot of time. – Marcin Sep 19 '13 at 18:41
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Also, as a minimum, you should be able to run python to complete this project. I'm voting to close this question. – Marcin Sep 19 '13 at 18:41
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The basic format (which is quite common and present in every single programming language I can think of) is start:end:step. It helps to specify the parameters for an implicit loop. – Shashank Sep 19 '13 at 18:43
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3The code runs in every installed python interpreter. so "I do not installed python libraries" is a very lame excuse – Sep 19 '13 at 18:54
1 Answers
10
-1 step just reverts the direction of the slice:
>>> x = "Hello World !"
>>> x[6]
'W'
>>> x[2]
'l'
>>> x[6:2:-1]
'W ol'
[6:2:-1] means give me a slice from the 6th to the 2nd item (not including), reversed.
FYI, you don't need python installed for checking the result of the code you've asked about, go to pythonanywhere and play:
PythonAnywhere is a Python development and hosting environment that displays in your web browser and runs on our servers.
Also see:
