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def genrand(small, big) :
return small + (big-small) * random.random()
def display(small, big) :
return r'请输入上下限(默认%.2f~%.2f):' % (small, big)
big = 100
small = 0
while True :
try :
s = input(display(small, big)).strip()
if s.lower() == 'exit' :
break
a = s.split()
if a != [] :
big = float(a[1])
small = float(a[0])
rand = genrand(small, big)
print('(%.2f~%.2f): %.3f\n' % (small, big, rand))
except :
print('--Error--\n')
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