python小白，请大神写一个小程序，最多5句话吧，谢谢 用python编写一个小程序
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def input_1():
a = raw_input('Please input something:\n')
global st
st = list(a)
print 'Now the list you just inputted is:\n',st
success = True
while success:
input_1()
for i in st:
c = st.count(i)
if c >= 3:
print 'You lost!'
print 'Error: The number of %s you just input is %s '%(i,c)
success = True
break
print 'The number of %s you inputted is %s time(s)'%(i,c)
success = False
print 'Success!'
def f():
a=input('first number:')
b=input('second number:')
print(a+' + '+ b +' = ',int(a)+int(b))
f()
first number:4
second number:5
4 + 5 = 9
a,b=[float(items) for items in input("请输入两个数，以逗号分隔:
").split(',')]
print(a+b)
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