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Treelib: Add first_brother

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This commit is contained in:
Pavel 'LEdoian' Turinsky 2020-03-18 22:36:07 +01:00
parent 8fcb1b0871
commit 63dd0da97c
1 changed files with 8 additions and 4 deletions
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12
seminar/treelib.py
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@ -18,13 +18,17 @@ def safe_pred(node):
except ObjectDoesNotExist:
return None
def first_brother(node):
brother = node
while safe_pred(brother) is not None:
brother = safe_pred(brother)
return brother
# A to samé pro .father_of_first
def safe_father_of_first(node):
first_brother = node
while safe_pred(first_brother) is not None:
first_brother = safe_pred(first_brother)
first = first_brother(node)
try:
return first_brother.father_of_first
return first.father_of_first
except ObjectDoesNotExist:
return None