class Solution:
def isUnique(self, astr: str) -> bool:
for i in astr:
if astr.count(i) == 1:
continue
else:
return False
return True
class Solution:
def isUnique(self, astr: str) -> bool:
for i in astr:
if astr.count(i) == 1:
continue
else:
return False
return True