功能

def find_value(num_list,target):
    target_loc = []  # list to store the location of the target
    condition = True
    while condition == True:
        for target in num_list:
            if target in num_list:
                index = num_list.index(target)
                target_loc.append(index)
                condition = True
        else:
            condition = False    
    return target_loc

主程序：

num_list = keep_positive_numbers()
print()
print("List entered: ",num_list)
print()
target = int(input("Enter target = "))
print()
list = find_value(num_list,target)
print("Target exists at location(s): ",list)

输出

输入一个正整数：9 输入一个正整数：9 输入一个正整数：8 输入一个正整数：0

输入的列表：[9，9，8]

输入目标= 7

目标存在于[0、0、2]个位置