Запрос: Создать телефонный справочник с возможностью импорта и экспорта данных в формате .txt. Фамилия, имя, отчество, номер телефона — данные, которые должны находиться в файле. Дополнить справочник возможностью копирования данных из одного файла в другой.

```python
def create_phonebook():
phonebook = []
while True:
entry = {}
entry['last_name'] = input("Enter last name: ")
entry['first_name'] = input("Enter first name: ")
entry['middle_name'] = input("Enter middle name: ")
entry['phone_number'] = input("Enter phone number: ")
phonebook.append(entry)

choice = input("Add another entry? (y/n): ")
if choice.lower() != 'y':
break

return phonebook

def export_phonebook(phonebook, filename):
with open(filename, 'w') as file:
for entry in phonebook:
file.write(f"{entry['last_name']}, {entry['first_name}, {entry['middle_name]}, {entry['phone_number']}\n")

def import_phonebook(filename):
phonebook = []
with open(filename, 'r') as file:
for line in file:
data = line.strip().split(', ')
entry = {'last_name': data[0], 'first_name': data[1], 'middle_name': data[2], 'phone_number': data[3]}
phonebook.append(entry)

return phonebook

def copy_entry(source_file, destination_file, entry_number):
phonebook = import_phonebook(source_file)
entry = phonebook[int(entry_number) - 1]
with open(destination_file, 'a') as file:
file.write(f"{entry['last_name']}, {entry['first_name}, {entry['middle_name]}, {entry['phone_number']}\n")

def search_entry(phonebook, keyword):
results = []
for entry in phonebook:
if keyword.lower() in entry['last_name'].lower() or keyword.lower() in entry['first_name']:
results.append(entry)

return results

phonebook = create_phonebook()
export_phonebook(phonebook, 'phonebook.txt')

copy_entry('phonebook.txt', 'new_phonebook.txt', 2)

keyword = input("Enter search keyword: ")
results = search_entry(phonebook, keyword)
for result in results:
print(result)
```
This code creates a phonebook with the ability to import and export data in .txt format. It also allows users to copy data from one file to another by entering the line number. Users can search for specific entries by entering a keyword (e.g. name or surname). The code uses functions to organize the program and ensure it is not linear.

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