由于jamylak建议将if条件更改为：
if a == 'y' or 1 <= int(a) <= 10:
程序：
def checkinginput():
while True:
try:
a = input('enter')
if a == 'y' or 1 <= int(a) <= 10:
return a
else:
print('Invalid input!')
except ValueError:
print('Value error! Please try again!')
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