Python 在第一行以外的任何行都找不到短语(新)

Question

和我的last question ，我的程序无法检测到一个短语并将其与第一行以外的任何行匹配。但是，我已经解决并回答了。但现在我需要一个新的 def函数，它删除某个(给定 refName )联系人及其下方与该联系人相关的 4 行，但是，我遇到了与 readfile 相同的问题功能;它只检测第一行，而不检测其他任何内容。

读取文件

def readFile(self):

    lookup = input("Type in a contact REFERENCE name.\n")

    with open('contacts.txt') as myFile:
        my_file_iter = iter(myFile)
        for num, line in enumerate(my_file_iter, 1):
            if lookup.upper() in line:

                print(line)
                print(next(my_file_iter))
                print(next(my_file_iter))
                print(next(my_file_iter))
                print(next(my_file_iter))
                break
        else:
            print("Contact not found.")
    self.managerMenu()

删除联系人

def delContact(self):

    lookup = input("Type in a contact REFERENCE name.\n")

    with open('contacts.txt') as myFile:
        my_file_iter = iter(myFile)
        for num, line in enumerate(my_file_iter, 1):
            if lookup.upper() != "YOU":
                if lookup.upper() in line:
                    # read a list of lines into data
                    data = myFile.readlines()
                    print("Deleting contact ", data[num - 1][9:])
                    # now change the  lines, note that you have to add a newline
                    data[num - 1] = ''
                    data[num] = ''
                    data[num + 1] = ''
                    data[num + 2] = ''
                    data[num + 3] = ''
                    # and write everything back
                    myFile.writelines( data )

                    break
                else:
                    print("Contact not found.")
                    break

            else:
                print("Cannot delete yourself!")
                self.delContact()

    self.managerMenu()

联系人.TXT

Contact: YOU
    First Name: FELIX
    Last Name: MARTIN
    Number: (555)-555-5554
    Address: 3550 VISTA PARK DRIVE
Contact: FRIEND
    First Name: DAVID
    Last Name: BRENNEMAN
    Number: (555)-555-5555
    Address: 123 SESAME STREET
Contact: MOM
    First Name: SANDY
    Last Name: MARTIN
    Number: (555)-555-5556
    Address: 3550 VISTA PARK DRIVE

当我运行我的程序时，readfile 和 delcontact 都会发生这种情况。

(请记住，代码摘录和程序的某些部分是整个项目的一部分，此处未提及，以消除任何混淆。整个文件将在末尾标记。)

readFile

Contact Manager v1.4 - Felix Martin
Loading... Loaded!
Welcome, FELIX

Available Commands: Info, ReadFile, DeleteContact, EditContact, AddContact, quit()
readfile
Type in a contact REFERENCE name.
you
Contact: YOU

    First Name: FELIX

    Last Name: MARTIN

    Number: (555)-555-5554

    Address: 3550 VISTA PARK DRIVE

Available Commands: Info, ReadFile, DeleteContact, EditContact, AddContact, quit()
readfile
Type in a contact REFERENCE name.
friend
Contact: FRIEND

    First Name: DAVID

    Last Name: BRENNEMAN

    Number: (555)-555-5555

    Address: 123 SESAME STREET

Available Commands: Info, ReadFile, DeleteContact, EditContact, AddContact, quit()

删除联系人

Contact Manager v1.4 - Felix Martin
Loading... Loaded!
Welcome, FELIX

Available Commands: Info, ReadFile, DeleteContact, EditContact, AddContact, quit()
deletecontact
Type in a contact REFERENCE name.
you
Cannot delete yourself!
Type in a contact REFERENCE name.
friend       
Contact not found.
Available Commands: Info, ReadFile, DeleteContact, EditContact, AddContact, quit()

有什么想法吗？我要求在提交答案时，我更喜欢按照我展示的方式完成，而不是使用 RegEx，如果可能的话，在 Python 3.4 中完成。

Contact Manager File

Answer 1

听起来您需要一套更全面的工具来处理您的数据。如果您打算学习一个(非常有值(value)的)新模块，我强烈建议您将这些数据迁移到某种类型的数据库中。 sqlite3是 Python 的流行数据库，从 Python 2.5 开始包含在标准库中。

就是说，如果您致力于将其制作为平面文件，听起来您真的真的需要一个函数来为自己构建一个数据的工作副本，以更有用的方式(如字典)进行。我建议在应用程序运行时立即运行它，并引用数据库以进行任何进一步的调用。

def build_db(path):
    db = {}
    with open(path) as f:
        for line in f:
            category, value = map(str.strip, line.split(":"))
            if category == "CONTACT":
                cur_contact = value
                db[value] = {}
            else:
                db.get(cur_contact, {})[category] = value
    # builds a dictionary of dictionaries that looks like:
    # # {"YOU": {"First Name": "FELIX", "Last Name": "MARTIN", ...}, ...}
    return db

然后在你的应用程序的入口点你可以写:

db = build_db("path/to/your/file.txt")

从那时起，任何读取或写入都是通过您设计的 API 访问 db 对象来处理的。

def read_contact(db, contact_name):
    formatting = """\
CONTACT: {contact}
    First Name: {First Name}
    Last Name: {Last Name}
    Number: {Number}
    Address: {Address}
"""
    contact_info = db.get(contact_name)
    if contact_info is None:
        raise KeyError("No such contact: {}".format(contact_name))
    contact_info['contact'] = contact_name
    return formatting.format(**contact_info)

def write_db_to_file(db, out_path):
    with open(out_path, 'w') as outf:
        for contact_name in db:
            outf.write(read_contact(db, contact_name))

def remove_user_from_db(db, contact_name):
    try:
        del db[contact_name]
    except KeyError:
        raise KeyError("No such contact: {}".format(contact_name))