為什么在logging.info中顯示名稱錯誤？

Question

我收到以下代碼的錯誤：

logging.info（“ {a}，{b}的斜邊為{c}”。.format（a = 3，b = 4，c =斜邊（a，b）））NameError：未定義名稱'a'

---

import logging
logging.basicConfig(level=logging.INFO)

def hypotenuse(a, b):
    """Compute the hypotenuse"""
    return (a**2 + b**2)**0.5

logging.info("Hypotenuse of {a}, {b} is {c}".format(a=3, b=4, c=hypotenuse(a,b)))

期望的

INFO:root:Hypotenuse of 3, 4 is 5.0

Answer 1

我很確定它將起作用的唯一方法是在調用之前定義變量：

a,b = (3,4)
logging.info("Hypotenuse of {a}, {b} is {c}".format(a=a, b=b, c=hypotenuse(a,b))

可能更清楚一點：

a,b = (3,4)
logging.info("Hypotenuse of {}, {} is {}".format(a, b, hypotenuse(a,b))

Answer 2

logging.info("Hypotenuse of {a}, {b} is {c}".format(a=3,b=4, c=hypotenuse(3,4)))

Answer 3

你可以試試 ：

a = 3
b = 4
logging.info(f'Hypotenuse of {a}, {b} is {hypotenuse(a, b)}')