Question

给出下面的代码-2个字典和for循环。

如果我取消缩进行sim_choice = raw_input("\nPlease enter item code for the SIM card you want?: ")，则其上方的打印语句print(" " + str(value))将打印sims词典中的所有值，但else语句将变为无效。当前输出仅打印sims中的第一个值？例如：

Please tell me your name? X
Hello X
Please enter item code for the phone or tablet you want?: BPCM
Item Code Chosen BPCM['Phone', 'Description: Compact', 'price', 29.99]
As you chose a phone, would you like a SIM free or Pay As You Go for - ['Phone', 'Description: Compact', 'price', 29.99]

Item Code: SMNO
 ['SIM card', 'Description: SIM Free (no SIM card purchased)', 'price', 0.0]

Please enter item code for the SIM card you want?:

我看不到为什么它不会在当前状态下打印sims词典中的所有值？

device = {
    'BPCM' : ['Phone', 'Description: Compact', 'price', 29.99],
    'BPSH' : ['Phone', 'Description: Clam Shell', 'price', 49.99],
    'RTMS' : ['Tablet', 'Description: RoboTab - 10-inch screen and 64GB memory', 'price', 299.99],
    'RTLM' : ['Tablet', 'Description: RoboTab - 10-inch screen and 256 GB memory', 'price', 499.99],
    } 

sims = {    
    "SMNO" : ['SIM card', 'Description: SIM Free (no SIM card purchased)', 'price', 0.00],
    "SMPG" : ['SIM card', 'Description: Pay As You Go (SIM card purchased)', 'price', 9.99],
    }

print("Hello customer, here is your list of phones or tablets. Please choose a phone or tablet by entering your name and the item code:")  
for key, value in device.items(): 
    print("\nItem Code: " + key)
    print(" " + str(value)) 
name = raw_input("\nPlease tell me your name? ") 
print("Hello " + name)
device_choice = raw_input("Please enter item code for the phone or tablet you want?: ") 

if device_choice in device.keys():
    print("Item Code Chosen " + device_choice + str(device[device_choice])) 
sim_cards = ['BPCM', 'BPSH']
if device_choice in sim_cards:
    print("\nAs you chose a phone, would you like a SIM free or Pay As You Go for - " + str(device[device_choice])) 
    for key, value in sims.items():
        print("\nItem Code: " + key)
        print(" " + str(value)) 
        sim_choice = raw_input("\nPlease enter item code for the SIM card you want?: ") 
    else: 
        print("Item Code Chosen " + device_choice + str(device[device_choice]))

Answer 1

这是因为<div id="box">box</div>是一个阻塞语句，这意味着它将在此处停止您的代码，直到发生事件（在这种情况下为用户输入）为止。

要解决您的raw_input语句的问题，应取消缩进以使其与else对应的语句对齐。

Answer 2

我认为您只需要删除最后3行中的缩进

if device_choice in sim_cards:
    print("\nAs you chose a phone, would you like a SIM free or Pay As You Go for - " + str(device[device_choice])) 
    for key, value in sims.items():
        print("\nItem Code: " + key)
        print(" " + str(value)) 
    sim_choice = raw_input("\nPlease enter item code for the SIM card you want?: ") 
else: 
    print("Item Code Chosen " + device_choice + str(device[device_choice]))

为什么只有字典打印中的第一个值

2 个答案: