The title is the teacher’s lesson, which is adapted from the python language design basis of Songtian teacher of Beijing Institute of technology, page 4.7, 121

Please modify example 5: body mass index BMI with exception handling, so that it can receive and process any input from the user

while True:
try:
Height, weight = Eval (input (“please input height (m) and weight (kg) [separated by commas]:”)
0         bmi = weight/pow(height,2)
Print (“BMI value is: {. 2F}”. Format (BMI))
0         if height > 3:
if h[:-1].isinstance():
Print (“height value is {. 2F}”. Format (height))
0                 break
elif weight > 150:
if   w[:-1].isinstance():
Print (“body weight value is {. 2F}”. Format (weight))
0                 break
except NameError:
Print (“input error, please input correct information”)
the     else:
Print (“no exception occurred”)
finally:
Print (“complete”)

The cause of the error is an operation on an object that cannot be operated on

The original errors were height [: – 1]. Isinstance and weight [: – 1]. Isinstance, which were changed to h and W

Please input height (m) and weight (kg) [comma separated]: 4,85
BMI value: 5.31
input error, please input correct information
complete
please input height (m) and weight (kg) [comma separated]: 1.85,85
BMI value: 24.84
no abnormality
complete
please input height (m) and weight (kg) [comma separated]: 1.85, 200
BMI value: 58.44
input error, please input correct information
complete
please input height (m) and weight (kg) [separated by commas]: