Custom Exceptions

import sys
if len(sys.argv) > 1:
reader = open(sys.argv[1])
else:
reader = sys.stdin
x = float(reader.readline())
y = float(reader.readline())
if y == 0:
print(“Error”)
else:
z = x / y
print(z)

import sys
if len(sys.argv) > 1:
reader = open(sys.argv[1])
else:
reader = sys.stdin
x = float(reader.readline())
y = float(reader.readline())
if y == 0:
print(“Error”)
else:
z = x / y
print(z)

import sys
if len(sys.argv) > 1:
reader = open(sys.argv[1])
else:
reader = sys.stdin
x = float(reader.readline())
y = float(reader.readline())
if y == 0:
raise ValueError(“Cannot divide by zero”)
else:
z = x / y
print(z)

import sys
if len(sys.argv) > 1:
reader = open(sys.argv[1])
else:
reader = sys.stdin
x = float(reader.readline())
y = float(reader.readline())
if y == 0:
raise ValueError(“Cannot divide by zero”)
else:
z = x / y
print(z)