這個python代碼有什麼問題？如果和其他語句

Question

from datetime import datetime 

time_enter = datetime.now() 
print ("Has a car entered the section?") 
if raw_input() == "yes": 
    print (datetime.now().strftime("%H:%M:%S.%f")) 
    datetime.now().strftime("%H:%M:%S.%f") 
    time_leave= datetime.now() 
    print ("Has a car leaved the section?") 
    if raw_input() == "yes": 
     print (datetime.now().strftime("%Y-%m-%d %H:%M:%S")) 
     time_taken_to_travel = time_leave - time_enter 
     print (time_taken_to_travel) 
    else: 
     print ("No car has leaved!") 

else: 
    print ("No car has entered!") 
    print ("No car has leaved!") 

你好，我已經編輯了我的代碼，如下所述，但它說第5行和原始輸入有某種錯誤。你能幫助糾正它嗎？

Has a car entered the section? 
Traceback (most recent call last): 
    File "E:\code.py", line 5, in <module> 
    if raw_input() == "yes": 
NameError: name 'raw_input' is not defined 

Answer 1

不要太苛刻，我必須說你的代碼看起來像一個大面條混亂。新的功能，將邏輯分解爲功能等等，可以很容易地給出代碼的更好的概述。

初看起來，這部分代碼至少是錯誤的。當你定義一個else語句時，它需要有一個縮進塊來執行。

else: 
print("No car has leaved!") 
time_taken_to_travel = time_leave - time_enter 
print (time_taken_to_travel) 

應該與此類似，或者你正在嘗試做的:)

else: 
    print("No car has leaved!") 

time_taken_to_travel = time_leave - time_enter 
print (time_taken_to_travel) 

編輯：

OK，關頂，固定的代碼在Python 2.7運行，如果在Python> 3中運行，請注意不同的使用print。

首先，在編寫Python時，縮進非常重要。區分4個空格和縮進。你的代碼太多了。您無需撥打datetime.datetime.now，只需撥打datetime.now即可。其次，爲什麼當你減去em時將日期轉換爲字符串？將它們保留爲日期並作爲輸入，intput不是最佳解決方案。它將驗證輸入的字符串。改爲使用raw_input。

from datetime import datetime 

time_enter = datetime.now() 
print "Has a car entered the section?" 
if raw_input() == "yes": 
    print datetime.now().strftime("%H:%M:%S.%f") 
    datetime.now().strftime("%H:%M:%S.%f") 
    time_leave= datetime.now() 
    print "Has a car leaved the section?" 
    if raw_input() == "yes": 
     print datetime.now().strftime("%Y-%m-%d %H:%M:%S") 
    else: 
     print "No car has leaved!" 
     time_taken_to_travel = time_leave - time_enter 
     print time_taken_to_travel 
else: 
    print "No car has entered!" 
    print "No car has leaved!" 

隨着輸出：

Has a car entered the section? 
yes 
11:41:54.281000 
Has a car leaved the section? 
yes 
2015-10-15 11:41:55