<p>最简单的方法是使变量循环全局化</p>
<pre><code>loop = True
def main():
global loop
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:
program1()
elif answer == 2:
program2()
elif answer == 3:
program3()
else:
loop = False
def program1():
global loop
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''')
loop = False #Here is the issue
#The rest of the programs would be the same
main()
</code></pre>
<p>Global将允许您在任何地方都有相同的w/r变量。没有全局变量,所有变量都是局部变量。在</p>