- 论坛徽章:
- 0
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- def isnum(a):
- if type(a)==type(1):
- return True
- return False
- def first_root(a):
- print a[1],'-',
- if isnum(a[0]):
- print a[0],'-',
- else:
- first_root(a[0])
- if isnum(a[2]):
- print a[2],'-',
- else:
- first_root(a[2])
- def middle_root(a):
- if isnum(a[0]):
- print a[0],'-',
- else:
- middle_root(a[0])
- print a[1],'-',
- if isnum(a[2]):
- print a[2],'-',
- else:
- middle_root(a[2])
- def last_root(a):
- if isnum(a[0]):
- print a[0],'-',
- else:
- last_root(a[0])
- if isnum(a[2]):
- print a[2],'-',
- else:
- last_root(a[2])
- print a[1],'-',
- btree=[[1,2,3],2,[1,2,3]]
- print "first"
- first_root(btree)
- print
- print "middle"
- middle_root(btree)
- print
- print "last"
- last_root(btree)
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