cannot assign to f-string expression code example

Example 1: not using f string in python

>>> "Hello, {}. You are {}.".format(name, age)
'Hello, Eric. You are 74.'

Example 2: not using f string in python

>>> "Hello, {1}. You are {0}.".format(age, name)
'Hello, Eric. You are 74.'

Example 3: not using f string in python

>>> first_name = "Eric"
>>> last_name = "Idle"
>>> age = 74
>>> profession = "comedian"
>>> affiliation = "Monty Python"
>>> print(("Hello, {first_name} {last_name}. You are {age}. " + 
>>>        "You are a {profession}. You were a member of {affiliation}.") \
>>>        .format(first_name=first_name, last_name=last_name, age=age, \
>>>                profession=profession, affiliation=affiliation))
'Hello, Eric Idle. You are 74. You are a comedian. You were a member of Monty Python.'