Python（可以保存值的语法）

Question

我一直在尝试通过使用以下函数来解决这个问题。当程序完成循环时，我应该如何存储所有数字输入值并仅在程序结束时打印它们。

def compare(a):
    a=0
    while True:
        b=input("Enter an integer : ")
        if b.isdigit():
            k=n+1
            a=a+int(b)
        elif b.isalpha():
            if b.upper()=="Q":
                print("Digits\n",a,"\nTotal\n",a)
                break
            else:
                print("Invalid Value. Enter again")
        elif b.isalnum():
            print("Value not recognized. Enter a valid value.")
        else:
            print("Unrecognized value is submitted. Enter again")

Answer 1

我假设您希望 Total 打印数字的数量，而不是数字的总和。与您的代码相比，带有 cmets 的工作版本：

def compare(): # input value is not used
    a=[] # changed a to a list instead of integer
    n=0 # hold the number of digits that were entered
    while True:
        b=input("Enter an integer : ")
        if b.isdigit():
            n+=1 # add 1 to the number of digits that were entered, variable k is not used
            a.append(int(b)) #append the entered digit to list a
        elif b.isalpha():
            if b.upper()=="Q":
                print("Digits\n",*a,"\nTotal\n",n) # use print(*a) to print the list of numbers
                break
            else:
                print("Invalid Value. Enter again")
        elif b.isalnum():
            print("Value not recognized. Enter a valid value.")
        else:
            print("Unrecognized value is submitted. Enter again")

Answer 2

根据问题更新您的代码

def compare(a):
    a=0
    all_digits = []  # Empty list
    while True:
        b=input("Enter an integer : ")
        if b.isdigit():
            all_inputs.append(b)  # Append digit to list
            k=n+1
            a=a+int(b)
        elif b.isalpha():
            if b.upper()=="Q":
                print("Digits\n",a,"\nTotal\n",a)
                print("all digits: {}".format(all_digits))
                break
            else:
                print("Invalid Value. Enter again")
        elif b.isalnum():
            print("Value not recognized. Enter a valid value.")
        else:
            print("Unrecognized value is submitted. Enter again")

但这会是更好的代码：

def compare(): # no need to pass any argument
    a = 0
    all_digits = []               # Empty list
    while True:
        b = raw_input("Enter an integer: ")
        if b.isdigit():
            all_digits.append(b)  # Append digit to list
            a = a + int(b)            # do not see 'k' being used anywhere
        elif b.isalpha():
            if b.upper() == "Q":
                print("Digits: {}\nTotal: {}\nSum: {}".format(", ".join(all_digits), len(all_digits), a))
                break
            else:
                print("Invalid Value. Enter again")
        else:                     # no need of b.isalnum(). this will take care of both
            print("Unrecognized value is submitted. Enter again")

输出

Enter an integer: 1
Enter an integer: 2
Enter an integer: 3
Enter an integer: 4
Enter an integer: 5
Enter an integer: Q
Digits: 1, 2, 3, 4, 5
Total: 5
Sum: 15