Python Version 2.0
Windows Vista (I know, I know...)
Im very new to python and have only been doing it for two weeks.
print 'Type in lowercase!';
String_Var = raw_input ('Add, Divide, Multiply or Subtract? ');
if 'add' in String_Var:
AddVar1 = raw_input ('Number 1: ');
AddVar2 = raw_input ('Number 2: ');
Add_Var = AddVar1 + AddVar2;
print AddVar1, '+', AddVar2, '=', Add_Var;
else:
if 'subtract' in String_Var:
SubVar1 = raw_input ('Number 1: ');
SubVar2 = raw_input ('Number 2: ');
Sub_Var = SubVar1 - SubVar2;
print SubVar1, '+', SubVar2, '=', Sub_Var;
else:
if 'multiply' in String_Var:
MultiplyVar1 = raw_input ('Number 1: ');
MultiplyVar2 = raw_input ('Number 2: ');
Multpiply_Var = MultiplyVar1 + MultiplyVar2;
print MultiplyVar1, '+', MultiplyVar2, '=', Multiply_Var;
else:
if 'divide' in String_Var:
DivVar1 = raw_input ('Number 1: ');
DivVar2 = raw_input ('Number 2: ');
Div_Var = DivVar1 + DivVar2;
print DivVar1, '+', DivVar2, '=', Div_Var;
else:
print 'Syntax Error.'
I created this code, but it keeps coming up with 'else' syntax error!
8  1287  - print 'Type in lowercase!'
-
String_Var = raw_input ('Add, Divide, Multiply or Subtract? ')
-
-
if 'add' in String_Var:
-
AddVar1 = raw_input ('Number 1: ')
-
AddVar2 = raw_input ('Number 2: ')
-
Add_Var = AddVar1 + AddVar2
-
print AddVar1, '+', AddVar2, '=', Add_Var
-
elif 'subtract' in String_Var:
-
SubVar1 = raw_input ('Number 1: ')
-
SubVar2 = raw_input ('Number 2: ')
-
Sub_Var = SubVar1 - SubVar2
-
print SubVar1, '+', SubVar2, '=', Sub_Var
-
elif 'multiply' in String_Var:
-
MultiplyVar1 = raw_input ('Number 1: ')
-
MultiplyVar2 = raw_input ('Number 2: ')
-
Multpiply_Var = MultiplyVar1 + MultiplyVar2
-
print MultiplyVar1, '+', MultiplyVar2, '=', Multiply_Var
-
elif 'divide' in String_Var:
-
DivVar1 = raw_input ('Number 1: ')
-
DivVar2 = raw_input ('Number 2: ')
-
Div_Var = DivVar1 + DivVar2
-
print DivVar1, '+', DivVar2, '=', Div_Var
-
else:
-
print 'Syntax Error.'
Python doesn't use semicolons or {} brackets for syntax... it's all about the indentation!
Thank you, the else problem is solved now. What is the command for 'divide'?
 - while True:
-
String_Var = raw_input ('Add, Divide, Multiply, Subtract, or Quit? ').lower()
-
-
if 'add' in String_Var:
-
AddVar1 = float(raw_input ('Number 1: '))
-
AddVar2 = float(raw_input ('Number 2: '))
-
Add_Var = AddVar1 + AddVar2
-
print AddVar1, '+', AddVar2, '=', Add_Var
-
elif 'sub' in String_Var:
-
SubVar1 = float(raw_input ('Number 1: '))
-
SubVar2 = float(raw_input ('Number 2: '))
-
Sub_Var = SubVar1 - SubVar2
-
print SubVar1, '-', SubVar2, '=', Sub_Var
-
elif 'mul' in String_Var:
-
MultiplyVar1 = float(raw_input ('Number 1: '))
-
MultiplyVar2 = float(raw_input ('Number 2: '))
-
Multiply_Var = MultiplyVar1 * MultiplyVar2
-
print MultiplyVar1, '*', MultiplyVar2, '=', Multiply_Var
-
elif 'div' in String_Var:
-
DivVar1 = float(raw_input ('Number 1: '))
-
DivVar2 = float(raw_input ('Number 2: '))
-
Div_Var = DivVar1 / DivVar2
-
print DivVar1, '/', DivVar2, '=', Div_Var
-
elif 'q' in String_Var:
-
break
-
else:
-
print 'Syntax Error.'
This one's fixed for actual use of numbers... which I didn't notice before.
When you use raw_input it takes the user's input as a string. You need to type cast into either float() or int() in order to perform mathematical operations.
- while True:
-
String_Var = raw_input ('Add, Divide, Multiply, Subtract, or Quit? ').lower()
-
-
if 'add' in String_Var:
-
AddVar1 = float(raw_input ('Number 1: '))
-
AddVar2 = float(raw_input ('Number 2: '))
-
Add_Var = AddVar1 + AddVar2
-
print AddVar1, '+', AddVar2, '=', Add_Var
-
elif 'sub' in String_Var:
-
SubVar1 = float(raw_input ('Number 1: '))
-
SubVar2 = float(raw_input ('Number 2: '))
-
Sub_Var = SubVar1 - SubVar2
-
print SubVar1, '-', SubVar2, '=', Sub_Var
-
elif 'mul' in String_Var:
-
MultiplyVar1 = float(raw_input ('Number 1: '))
-
MultiplyVar2 = float(raw_input ('Number 2: '))
-
Multiply_Var = MultiplyVar1 * MultiplyVar2
-
print MultiplyVar1, '*', MultiplyVar2, '=', Multiply_Var
-
elif 'div' in String_Var:
-
DivVar1 = float(raw_input ('Number 1: '))
-
DivVar2 = float(raw_input ('Number 2: '))
-
Div_Var = DivVar1 / DivVar2
-
print DivVar1, '/', DivVar2, '=', Div_Var
-
elif 'q' in String_Var:
-
break
-
else:
-
print 'Syntax Error.'
This one's fixed for actual use of numbers... which I didn't notice before.
When you use raw_input it takes the user's input as a string. You need to type cast into either float() or int() in order to perform mathematical operations.
ok thanks for your help; ive tested the program and it works perfectly now.
Here's a little more exploration with python for ya: -
if 'add' in String_Var:
-
try:
-
AddVar1 = float(raw_input ('Number 1: '))
-
AddVar2 = float(raw_input ('Number 2: '))
-
except:
-
print 'Invalid input, numbers only please.'
-
continue
-
Add_Var = AddVar1 + AddVar2
-
print AddVar1, '+', AddVar2, '=', Add_Var
-
Play around with this and try entering a string into the number input.
Here's a little more exploration with python for ya:
-
if 'add' in String_Var:
-
try:
-
AddVar1 = float(raw_input ('Number 1: '))
-
AddVar2 = float(raw_input ('Number 2: '))
-
except:
-
print 'Invalid input, numbers only please.'
-
continue
-
Add_Var = AddVar1 + AddVar2
-
print AddVar1, '+', AddVar2, '=', Add_Var
-
Play around with this and try entering a string into the number input.
thanks. so, that will return an aerror message unless they enter a number?
Yes... when using a try: except: block, you can acheive many things.
Since this is a generic except: it will catch any and all "exceptions ". Sometimes it is good to have a specific exception listed, such as in this case:
ValueError is what is thrown when trying toconvert anything non-numerical via int() or float(). You can have multiple except statements, each with a different exception to catch different possible user-errors all followed by a blank "catch-all" except block to catch anything else that might happen. A good way to figure out what kind of error will be generated is to go into the shell, and perform something that you know will throw an exception, such as int('wtf'). ;)
There are also variations on the structure to look into (try, except, else, finally can all be incorporated). Which can provide a variety of error-checking and code balancing.
The finished product! - import math
-
-
while True:
-
String_Var = raw_input ('Add, Divide, Multiply, Subtract, Square, Square Root, Index Notation, or Quit? ').lower()
-
-
if 'add' in String_Var:
-
try:
-
Var1 = float(raw_input ('Number 1: '))
-
Var2 = float(raw_input ('Number 2: '))
-
except:
-
print 'Invalid input, numbers only please.'
-
continue
-
Var = Var1 + Var2
-
print Var1, '+', Var2, '=', Var
-
-
elif 'sub' in String_Var:
-
try:
-
Var1 = float(raw_input ('Number 1: '))
-
Var2 = float(raw_input ('Number 2: '))
-
except:
-
print 'Invalid input, numbers only please.'
-
continue
-
Var = Var1 - Var2
-
print Var1, '-', Var2, '=', Var
-
-
elif 'div' in String_Var:
-
try:
-
Var1 = float(raw_input ('Number 1: '))
-
Var2 = float(raw_input ('Number 2: '))
-
except:
-
print 'Invalid input, numbers only please.'
-
continue
-
Var = Var1 / Var2
-
print Var1, '/', Var2, '=', Var
-
-
elif 'mul' in String_Var:
-
try:
-
Var1 = float(raw_input ('Number 1: '))
-
Var2 = float(raw_input ('Number 2: '))
-
except:
-
print 'Invalid input, numbers only please.'
-
continue
-
Var = Var1 * Var2
-
print Var1, '*', Var2, '=', Var
-
-
elif 'sq' in String_Var:
-
try:
-
Var1 = float(raw_input ('Number: '))
-
except:
-
print 'Invalid input, numbers only please.'
-
continue
-
Var = Var1 * Var1
-
print Var1, 'squared =', Var
-
-
elif 'index' in String_Var:
-
try:
-
Var1 = float(raw_input ('Number: '))
-
Var2 = float(raw_input ('To the power of: '))
-
except:
-
print 'Invalid input, numbers only please.'
-
continue
-
Var = math.pow(Var1,Var2)
-
print Var1, 'to the power of', Var2, '=', Var
-
-
elif 'root' in String_Var:
-
try:
-
Var1 = float(raw_input ('Number: '))
-
except:
-
print 'Invalid input, numbers only please.'
-
continue
-
Var = sqrt (Var1)
-
print 'the square root of', Var1, 'is', Var, '.'
-
-
-
-
-
elif 'q' in String_Var:
-
break
-
-
else:
-
print 'Syntax Error.'
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