auto save

a.py

+def new_input():
+    total = []
+    while True:
+        unit = input('请输入（q退出）：')
+        if unit == 'q':
+            break
+        else:
+            try:
+                unit = int(unit)
+            except:
+                print("请重新输入一个数字")
+            else:
+                total.append(unit)
+            finally:
+                print("=====================")
+    return total
+
+
+#创建一个sum函数统计总价并返回
+def sum(num):
+    count=0
+    for i in num:
+        count+=i
+    return count
+
+
+price = new_input()
+#调用函数
+pay=sum(price)
+print("您一共消费了" + str(pay) + "元！扫码还是现金呢？")
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