In the question they asked me to pick up numbers from the user and then solve a quadratic equation. I did it and check it on Python Tutor and every time it return me None, why is that?
def quadratic_equation(a,b,c):
import math
if a == 0:
print("The parameter 'a' may not equal 0")
elif (b**2) - (4 * a * c) < 0:
print("The equation has no solutions")
else:
### x1 mean with +
x1 = ((-b) + (math.sqrt((b**2) - (4 * a * c)))) / (2 * a)
### x2 mean with -
x2 = ((-b) - (math.sqrt((b**2) - (4 * a * c)))) / (2 * a)
if x1 and x2 is not None:
return (f"The equation has 2 solutions: {x1} and {x2}")
elif x1 is None:
return (f"The equation has 1 solution: {x2} ")
elif x2 is None:
return (f"The equation has 1 solution: {x1} ")
def quadratic_equation_user_input():
numbers = (input("Insert coefficients a, b, and c: "))
num = []
for i in numbers.split():
try:
num.append(float(i))
except ValueError:
pass
a = num[0]
b = num[1]
c = num[2]
quadratic_equation(a,b,c)
print(quadratic_equation_user_input())
quadratic_equation_user_input
calls quadratic_equation
and ignores its return value, thus it returns None
which is the default return value.
# Call function but ignore return value
quadratic_equation(a,b,c)
# No return in caller function -> default to None
# ....
You probably meant
return quadratic_equation(a,b,c)
at the end of quadratic_equation_user_input
.