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Fix omitting end / beginning in ranges (#2649)
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@ -208,9 +208,9 @@ li[4] # Raises an IndexError
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# You can look at ranges with slice syntax.
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# (It's a closed/open range for you mathy types.)
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li[1:3] # => [2, 4]
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# Omit the beginning
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li[2:] # => [4, 3]
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# Omit the end
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li[2:] # => [4, 3]
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# Omit the beginning
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li[:3] # => [1, 2, 4]
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# Select every second entry
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li[::2] # =>[1, 4]
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