phylotree.py: PhyloTree will warn if you set both species and _specie…

…sFunction.

ete4/phylo/phylotree.py

@@ -6,6 +6,7 @@
 
 import sys
 import re
+import warnings
 import itertools
 from collections import defaultdict
 from ete4 import Tree, SeqGroup, NCBITaxa, GTDBTaxa
@@ -300,6 +301,9 @@ def __init__(self, newick=None, children=None, alignment=None,
     @property
     def species(self):
         if self.props.get('_speciesFunction'):
+            if 'species' in self.props:
+                warnings.warn('Ambiguous species: both species and _speciesFunction'
+                             'defined. You can remove "species" from this node.')
             try:
                 return self.props.get('_speciesFunction')(self.name)
             except: