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Extended to_json() to support sort key #123

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Extended to_json() to support sort key #123

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4 changes: 2 additions & 2 deletions treelib/tree.py
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Original file line number Diff line number Diff line change
Expand Up @@ -858,9 +858,9 @@ def to_dict(self, nid=None, key=None, sort=True, reverse=False, with_data=False)
{ntag: {"data": self[nid].data}}
return tree_dict

def to_json(self, with_data=False, sort=True, reverse=False):
def to_json(self, with_data=False, sort=True, reverse=False, key=None):
"""To format the tree in JSON format."""
return json.dumps(self.to_dict(with_data=with_data, sort=sort, reverse=reverse))
return json.dumps(self.to_dict(with_data=with_data, sort=sort, reverse=reverse, key=key))

def to_graphviz(self, filename=None, shape='circle', graph='digraph'):
"""Exports the tree in the dot format of the graphviz software"""
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