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尝试是这样的注意psudeo代码和实际代码和之间的差异，因为你希望用户输入比较一个数字，你需要将字符串输入转换为INT：
import sys
def proc_withdrawal():
print(“Your proc_withdrawal code goes here”)
def proc_balance():
print(“Your proc_balance code goes here”)
def proc_pin():
print(“Your proc_pin code goes here”)
def proc_bills():
print(“Your proc_bills code goes here”)
def proc_cancel():
print(“Thank you for using Simon Raivid’s Cash Machine, Have a nice day!”)
sys.exit(0)
while True:
print(“Simon Raivid’s Cash Machine”)
print(“===========================”)
print(“\t1 – Cash withdrawal”)
print(“\t2 – Balance”)
print(“\t3 – PIN Services”)
print(“\t4 – Pay bills”)
print(“\t5 – Cancel”)
user_option = int(input(“Please select an option 1-5: “))
if user_option == 1:
proc_withdrawal()
elif user_option == 2:
proc_balance()
elif user_option == 3:
proc_pin()
elif user_option == 4:
proc_bills()
elif user_option == 5:
proc_cancel()
else:
print(“Please only enter an option 1, 2, 3, 4 or 5”)
实例应用：
Simon Raivid’s Cash Machine
===========================
1 – Cash withdrawal
2 – Balance
3 – PIN Services
4 – Pay bills
5 – Cancel
Please select an option 1-5: 4
Your proc_bills code goes here!
Simon Raivid’s Cash Machine
===========================
1 – Cash withdrawal
2 – Balance
3 – PIN Services
4 – Pay bills
5 – Cancel
Please select an option 1-5: 5
Thank you for using Simon Raivid’s Cash Machine, Have a nice day!
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