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python - 如何将项目添加到具有扩展值的多维数组

问题描述

我正在做一个项目，我有一个包含名称、货币值等的列表列表。当用户输入一个值时，我在尝试更新主列表中的各个子列表时遇到了麻烦。

例如，我的列表包含 4 行（常量）和基于用户条目的不确定列数。我将整个程序包括在内，仅供参考，以防对它的外观有疑问：

spacing = '- ' * 45  # formatting for DONOR header
data_list = [['NAMES', 'DONATION AMOUNT', 'Number of Gifts', 'Avg Gifts'],
         ['Rudolph S', 1500, 3, 0],  
         ['Josef M', 250, 5, 0],
         ['Joye A', 5000, 2, None],
         ['Joni M', 2750, 1, None],
         ['Rachelle L', 750, 3, None],
         ['Vena U', 1000, 7, None],
         ['Efrain L', 10000, 1, None],
         ['Mee H', 15000, 2, None],
         ['Tanya E', 50000, 1, None],
         ['Garrett H', 800, 2, None]] 

def addtolist():
"""Method for sending 'Thank You' messages to Donors, using names *"""

    while True:
        print("Enter the name of the person you are writing to (or enter 'list' to see a list of names or Q to quit) ")
        fname_prompt = input("First Name: ").strip().capitalize()
        if fname_prompt.upper() == "Q":
            break
        elif fname_prompt.lower() == "list":  
            if len(data_list) - 1 % 2 != 0:
                for i in range(0, int(len(data_list) - 1 / 2)):
                    cut_off = int((len(data_list)) / 2)
                    if i == 0:               
                        print(spacing)
                        print('{:>44s}'.format(str(data_list[i][0])))  
                        print(spacing)
                    elif cut_off + i >= len(data_list):
                        continue
                    else:
                        print('{:>30s}'.format(data_list[i][0]), '{:>35s}'.format(data_list[cut_off + i][0]))
            else:
                if i == 0:                                                  
                    print(spacing)
                    print('{:>20s}'.format(str(data_list[i])))              
                    print(spacing)
                else:
                    print('{:>15s}'.format(data_list[i][0]), '{:>30s}'.format(data_list[cut_off + i][0]))
        else:
            lname_prompt = input("Last Name: ").strip().capitalize()
            if lname_prompt.upper() == "Q":
                break
            elif lname_prompt.lower() == "list":
                if len(data_list) - 1 % 2 != 0:
                    for i in range(0, int(len(data_list) - 1 / 2)):
                        cut_off = int((len(data_list)) / 2)
                        if i == 0:                                          
                            print(spacing)
                            print('{:>44s}'.format(str(data_list[i][0])))  
                            print(spacing)
                        elif cut_off + i >= len(data_list):
                            continue
                        else:
                            print('{:>30s}'.format(data_list[i][0]), '{:>35s}'.format(data_list[cut_off + i][0]))
                else:
                    if i == 0:  # for each item in list / 2 (5 x)
                        print(spacing)
                        print('{:>20s}'.format(str(data_list[i][0])))  
                        print(spacing)
                    else:
                        print('{:>15s}'.format(data_list[i][0]), '{:>30s}'.format(data_list[cut_off + i][0]))
            else:
                full_name = fname_prompt + " " + lname_prompt
                if full_name != "List List" or full_name != "list ":
                    name_found = False
                    for vals in data_list:
                        if full_name in vals:
                            name_found = True
                        else:
                            name_found = False

                        if name_found is False:
                            add_name = input("That name is not in the Donor list. Do you want to add it to the list?  ").upper()
                            if add_name == "Y":                                         
                                data_list.append([full_name])
                                if len(data_list) - 1 % 2 != 0:
                                    for i in range(0, int(len(data_list) - (len(data_list) - 2) / 2)):
                                        cut_off = int((len(data_list)) / 2)
                                            if i == 0:                                          
                                                print(spacing)
                                                print('{:>44s}'.format(str(data_list[i][0])))
                                                print(spacing)
                                            elif cut_off + i >= len(data_list):
                                                 print('{:>30s}'.format(data_list[i][0]))
                                                continue
                                            else:
                                                print('{:>30s}'.format(data_list[i][0]), '{:>35s}'.format(data_list[cut_off + i][0]))
                                 else:
                                     if i == 0:  # for each item in list / 2 (5 x)
                                         print(spacing)
                                         print('{:>20s}'.format(str(data_list[i][0])))  
                                         print(spacing)
                                     else:
                                         print('{:>15s}'.format(data_list[i][0]), '{:>30s}'.format(data_list[cut_off + i][0]))

                             donation_amt = int(input("Enter in the donation amount from Donor {0}: $".format(full_name)))
                             print('{0} has donated ${1}'.format(full_name, donation_amt))
                             data_list.append(donation_amt) # difficulty HERE
                             print(data_list)

我遇到困难的主线在最后带有评论“这里很难”。

data_list.append(donation_amt) # difficulty HERE

我正在尝试这样做，以便当用户输入新名称和新的捐赠金额（或者如果他们只是选择现有名称并附加捐赠金额），程序可以将货币价值附加/插入到关联的子列表（它附加到的名称）。我现在设置它的方式只是将数字量附加到较大列表的末尾，但我未能成功地将值附加到子列表......以前有没有人做过这样的事情？

标签： pythonarrayspython-3.xnested-listssublist

解决方案

看来您有 4 个静态列和不确定的行数。

您是否考虑过使用字典列表，例如 json 文档？

    data_list = [{
            'NAME':'Rudolph S',
            'DONATION AMOUNT' : 1500,
            'Number of Gifts' : 3,
            'Avg Gifts' :  0
        },{
            'NAME':'Josef M',
            'DONATION AMOUNT' : 250,
            'Number of Gifts' : 5,
            'Avg Gifts' :  None
        }]

等等。如果您可以引用各个键并更新它们的值，而不是使用列表和索引值，我认为您可能会更轻松地处理数据。

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