问如何从输入的浮点- Python用户中删除一组字符

EN

while True:
try:
    height_m = float(input("Enter your height in meters: "))
except ValueError:
    print ("Please enter a number without any other characters.")
    continue
else:break
while True:
try:
    weight_kg = float(input("Enter your weight in kilograms: "))
except ValueError:
    print ("Please enter a number without any other characters.")
    continue
else:break
bmi = weight_kg / (height_m ** 2)
print ("Your bmi is",(bmi),".")
if bmi < 18.5:
    print ("You are underweight.")
elif 18.5 <= bmi <=24.9:
    print ("You are of normal weight.")
elif 25 <= bmi <= 29.9:
    print ("You are overweight.")
else:
    print ("You are obese.")