I wrote a simple calculator script:
#!/usr/bin/python env
def calculator(n1, operator, n2):
f1 = float(n1)
f2 = float(n2)
if operator == '+':
return f1 + f2
elif operator == '-':
return f1 - f2
elif operator == '*':
return f1 * f2
elif operator == '/':
return f1 / f2
elif operator == '%':
return f1 % f2
elif operator == '**':
return f1 ** f2
else:
print "Can't perform operation: %s" % operator
print "Welcome to the calculator!"
print "Performs float operations"
print "Enter your problem like so: 5 * 3"
op = raw_input(">>> ")
op_list = op.split()
print calculator(op_list[0], op_list[1], op_list[2])
How do I handle an error that is caused when a
character other than a number is given to the
calculator as one of the operands? For example, if
the letter 'g' is given to the calculator the
following happens:
[EMAIL PROTECTED] ./chap5 134> python calculator.py
Welcome to the calculator!
Performs float operations
Enter your problem like so: 5 * 3
>>> g * h
Traceback (most recent call last):
File "calculator.py", line 26, in ?
print calculator(op_list[0], op_list[1],
op_list[2])
File "calculator.py", line 4, in calculator
f1 = float(n1)
ValueError: invalid literal for float(): g
"I'm the last person to pretend that I'm a radio. I'd rather go out and be a
color television set."
-David Bowie
"Who dares wins"
-British military motto
"I generally know what I'm doing."
-Buster Keaton
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