“应缩进块”错误

问题描述：

#define welcome as the main menu page for editing editing details. 
def welcome(): 
    print ('Welcome to SUNI-DAYS VILLA \n \nPlease choose to edit from the following:\n\n1-Personal Details\n2-Holiday Option\n3-Villa Options\n4-Additional Options\n\n0-Exit') 
    ('\n') 
    main_option = input ('Option:') 
#After choosing option, run their choice 
    if main_option ==('1'): 
     cust_opt() 
    if main_option ==('2'): 
     holiday_opt() 
    if main_option ==('3'): 
     villa_opt() 
    if main_option ==('4'): 
     add_opt() 
    if main_option ==('0'): 
     quit() 
    elif print ('Please choose a valid option:'): 

welcome() 

    #Option 1- from welcome() 
    def cust_opt(): 

    print ('Please answer ALL of the questions') 
    cust_title = input ('Choose an option:\n1-Mr\n2-Mrs\n3-Miss\n4-Ms\nTitle:') 
    if cust_title ==('1'): 
     cust_title1 ==('Mr') 
    if cust_title ==('2'): 
     cust_title1 ==('Mrs') 
    if cust_title ==('3'): 
     cust_title1 ==('Miss') 
    if cust_title ==('4'): 
     cust_title1 ==('Ms') 
    elif print ('Please choose your title') 
    cust_name = input ('Full Name:') 
    cust_age = input ('Age:') 
    cust_dono = input ('Door/Flat number:') 
    cust_str = input ('Street Name:') 
    cust_city = input ('City:') 
    cust_post = input ('Postcode:') 

    print(cus_title1 , cust_name, \ncust_age 'years old.',\n'Address:' ,  cust_dono, cust_str, \ncust_city, \ncust_post)

“预期的缩进块”错误是后给予的欢迎（）' 还挺吮吸，因为我刚刚开始学习它，我要去精神了。所以我用def来写一堆函数，然后运行它我没有'welcome（）' ..不是我想要做的“应缩进块”错误

你缺少的elif打印后'行（ “请选择一个有效的选项：”）：'' – DJMcMayhem

高清cust_opt（）：'不应该被缩进。 –

你认为这条线有什么作用？ 'elif print（'请选择一个有效的选项：'）：'也许你的意思是'else：print（'请选择一个有效的选项：'）' –

答

就像错误说的 - 你的缩进是关闭的。 Indentation is very important in Python。您可能也想要use a while loop for validating input。

def welcome(): 
    # ... 
    else: 
     print ('Please choose a valid option:') 
    return 

welcome() 

def cust_opt(): 
    # ... 
    else: 
     print ('Please choose your title') 
    # ... 
    return

“应缩进块”错误

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