我將如何編寫這個用 Python 2 編寫的 for 循環，稱為 python3 的語法中的字符串插值？

Question

for i in range(1, 12):
    print("no {} squared is {} and cubed is {:4}".format(i, i**2, i**4))

我習慣於使用這種方法編寫簡單的代碼，但是，有人告訴我這是 python2 方法，在未來發布新版本的 python 時將不再支持。 編寫此循環的新方法是什么？ 謝謝

Answer 1

python3的最新方法是使用 [f-strings][1] ，其中每個{}是語句（變量、表達式等）的占位符。 例如：

for i in range(1, 12):
    print(f"no {i} squared is {i**2} and cubed is {i**4:4}"

>>> 
no 1 squared is 1 and cubed is    1
no 2 squared is 4 and cubed is   16
no 3 squared is 9 and cubed is   81
no 4 squared is 16 and cubed is  256
no 5 squared is 25 and cubed is  625
no 6 squared is 36 and cubed is 1296
no 7 squared is 49 and cubed is 2401
no 8 squared is 64 and cubed is 4096
no 9 squared is 81 and cubed is 6561
no 10 squared is 100 and cubed is 10000
no 11 squared is 121 and cubed is 14641


  [1]: https://www.python.org/dev/peps/pep-0498/