Merge pull request #159 from felipeucelli/jsinterp-update

Fixed "slice must be applied on a list in: a.slice(0,0)"

pytubefix/jsinterp.py

@@ -942,9 +942,9 @@ def eval_method():
                     obj.reverse()
                     return obj
                 elif member == 'slice':
-                    assertion(isinstance(obj, list), 'must be applied on a list')
-                    assertion(len(argvals) == 1, 'takes exactly one argument')
-                    return obj[argvals[0]:]
+                    assertion(isinstance(obj, (list, str)), 'must be applied on a list or string')
+                    assertion(len(argvals) <= 2, 'takes between 0 and 2 arguments')
+                    return obj[slice(*argvals, None)]
                 elif member == 'splice':
                     assertion(isinstance(obj, list), 'must be applied on a list')
                     assertion(argvals, 'takes one or more arguments')