>>> name = 'yiyi'
>>> for i in range(3):
...     print(f"Task {name}: Compute factorial({i})...")  # has f
...
Task yiyi: Compute factorial(0)...
Task yiyi: Compute factorial(1)...
Task yiyi: Compute factorial(2)...
>>> for i in range(3):
...     print("Task {name}: Compute factorial({i})...")  # has no f
...
Task {name}: Compute factorial({i})...
Task {name}: Compute factorial({i})...
Task {name}: Compute factorial({i})...
>>>

f"Task {name}: Compute factorial({i})..."
等同于
"Task {name}: Compute factorial({i})..."`.format(name, i)

進(jìn)階 stackoverflow
py doc