Algebra math expression translated to python function with 2 inputs and a rounded answer

Question

Learning math to python conversion. Having trouble translating this math expression to a python function with two inputs (x, y). Help would be appreciated. I will have to catch up on my order of calculations its seems. Also some resources where I can learn more about this myself would be great. Thanks :)

The input variables x and y are single values If a division by zero occurs, raise a ValueError. Output should be rounded to 2 decimal places. You can calculate 𝑒𝑥 using the NumPy function np.exp(x)

def math_func(x, y):
    math_func = math.pi*np.exp(x))**2 / 4(y)
    return round(math_func, 2)

Answer 1

The following implements that mathematical function. You forgot to square the x. I recommend using parentheses to separate the numerator and denominator. It saves you from having to remember all the operator precedence and associativity rules. Moreover, you need to explicitly write 4 * y to multiply the two numbers ( 4y is a SyntaxError).

from math import exp, pi
def foo(x, y):
    try:
        res = (pi * exp(x * x)) / (4 * y)
    except ZeroDivisionError:
        raise ValueError
    return round(res, 2)

print(foo(2, 5))

Output

8.58

To sample dividing by zero, try foo(2, 0). The traceback message should indicate that a ZeroDivisionError occurred and that during handling of that exception, ValueError occurred.

Answer 2

You have several issues.

• avoid using the function name as internal variable (here I used z)
• you can't make implicit multiplications (use 4*y, 4(y) would mean you try to use 4 as a function, which is impossible)
• you had a wrong precedence: e^x^2 is e^(x^2)
• (minor) if you already import numpy you can use numpy.pi

corrected version

def math_func(x, y):
    import numpy as np
    z = np.pi*np.exp(x**2) / (4*y)
    return round(z, 2)

math_func(3, 4)
# 1591.04

Regarding the ValueError, unless this is for an assignment (in which case you can use try/except), it is probably better to keep the ZeroDivisionError that is more explicit than the more generic ValueError