<p>我想你想做的是让不同的程序返回一个值。在</p>
<p>问题是函数被执行但什么也不返回。你的main函数什么也不返回;因此循环变量永远不能被更新来中断循环。在</p>
<pre><code>#Issue is almost at the bottom
#Feel free to comment on the rest of the code as well,
#Always looking to improve
def main():
loop = True
while loop:
print('''MENU CHOICE''')
print('''1: go here''')
print('''2: go there''')
print('''3: You get the point''')
print('''0: Terminate program''')
print()
try:
answer = int(input('''I want to go to program: '''))
except:
print('''Not a valid menu choice, please try again''')
print()
if answer != 1 and answer != 2 and answer != 3 and answer != 0:
print('''Not a valid menu choice, please try again''')
print()
elif answer == 1:
return program1() # Return the output of this function
elif answer == 2:
return program2() # Return the output of this function
elif answer == 3:
return program3() # Return the output of this function
else:
loop = False
def program1():
print('''This is program 1''')
itdontwork = input('''Do you want to go back to the menu? Y/N''')
if itdontwork == 'Y' or itdontwork == 'y':
print()
else:
print('''SHUTTING DOWN''')
return False # Return the output of this function
#The rest of the programs would be the same
main()
</code></pre>