inp = raw_input
largest = None
smallest = None
while True:
num = raw_input('Enter a number: ')
if num = 'done' : break
print num
try :
num = float(inp)
except :
print 'Invalid input'
continue
if largest is None or num > largest :
largest = num
if smallest is None or num < smallest :
smallest = num
print 'Maximum is:', largest
print 'Minimum is:', smallest
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