while True:
try:
num1 = int(input('the first num:'))
num2 = int(input('the second num'))
result = num1 / num2
except Exception as err:
print(err)
else:
break #用以跳出循环，灭有异常测跳出循环
#finally:
# f.close()
#上下文管理器
#with
def trans(n):
if(n>=2):
trans(n//2)
print(n%2,end='')
p=trans(34)
#end = ''
#连续输出
