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class AddressBook:
 
    def __init__(self):
        self.address_dict = {}
 
    def __setitem__(self, key, value):
        self.address_dict[key] = value
 
    def __getitem__(self, item):
        return self.address_dict[item]
 
    def delete(self, name):
        del self.address_dict[name]
 
    def save(self):
        with open('address_dict.txt', 'tw', encoding='utf-8') as a:
            for i in self.address_dict.keys():
                a.write(f'{i}: {self.address_dict[i]}' + '\n')
 
a = AddressBook()
a['Vasya'] = 'Moskwa'
a['Petya'] = 'Piter'
a.delete('Vasya')
a.save()

Traceback (most recent call last):
  File "/usr/lib/python3.5/py_compile.py", line 125, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 735, in source_to_code
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "./prog.py", line 18
    a.write(f'{i}: {self.address_dict[i]}' + '\n')
                                         ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.5/py_compile.py", line 129, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 18
    a.write(f'{i}: {self.address_dict[i]}' + '\n')
                                         ^
SyntaxError: invalid syntax

Standard output is empty