How to use 'python substring left' in Python

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306def substring(self, start_idx=None, end_idx=None):
307 """ substring of the original string, [start_idx: end_idx]"""
308 if start_idx is None:
309 start_idx = 0
310 if end_idx is None:
311 end_idx = self.root.length_sum
312 elif start_idx < 0:
313 raise IndexError(start_idx)
314 elif end_idx > self.root.length_sum:
315 raise IndexError(end_idx)
316 leaves = self._sub_leaves(self.root, start_idx, end_idx)
317 return ''.join([node.value for node in leaves])

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