为什么在logging.info中显示名称错误？

Question

I am getting error for the below code:

logging.info("Hypotenuse of {a}, {b} is {c}".format(a=3, b=4, c=hypotenuse(a,b))) NameError: name 'a' is not defined

---

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)))

Desired Out

INFO:root:Hypotenuse of 3, 4 is 5.0

Answer 1

I'm pretty sure the only way it will work is defining the variables before the call:

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

possibly a little clearer:

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

you can try :

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