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Python Beginner Help (Calculator)
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Hello Everyone,
I just joined here hoping to increase my knowledge at python. I have been beginning to learn this language as of yesterday. I have decided that if I really want to increase my knowledge I should start on a project. Well here is my first project, a simple calculator. But for whatever reason when I run the program I'm getting some strange errors... Whatever help and advice you guys could give me would be most appreciated!
Thanks,
Inkcoder
I just joined here hoping to increase my knowledge at python. I have been beginning to learn this language as of yesterday. I have decided that if I really want to increase my knowledge I should start on a project. Well here is my first project, a simple calculator. But for whatever reason when I run the program I'm getting some strange errors... Whatever help and advice you guys could give me would be most appreciated!
#Calculator Test1
print "Calculator:"
print "1)+"
print "2)-"
print "3)*"
print "4)/"
print " "
print "Select Choice:"
op = input(">")
print " "
#Add
if op == "1":
print "a + b"
add1 = input("a:")
add2 = input("b:")
print "a + b =", add1+add2
#Sub
if op == "2":
print "a - b"
sub1 = input("a:")
sub2 = input("b:")
print "a - b =", sub1-sub2
#Multi
if op == "3":
print "a * b"
mul1 = input("a:")
mul2 = input("b:")
print "a * b =", mul1*mul2
#Div
if op == "4":
print "a / b"
div1 = input("a:")
div2 = input("b:")
print "a / b =", div1/div2Thanks,
Inkcoder
THe line:
Takes the input AND evaluates it. That means inputing "1" results in eval("1") which is int("1').
Putting in something like "a" results in the interpreter looking for a name "a" and not finding it.
For the beginning I recommend to use:
python Syntax (Toggle Plain Text)
Takes the input AND evaluates it. That means inputing "1" results in eval("1") which is int("1').
Putting in something like "a" results in the interpreter looking for a name "a" and not finding it.
For the beginning I recommend to use:
python Syntax (Toggle Plain Text)
Last edited by slate; Jun 7th, 2008 at 7:40 am.
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Join Date: Oct 2006
Posts: 2,279
Reputation: 
Solved Threads: 176
First, welcome to the forum!
What 'slate' is really telling you is that input() is for numbers and raw_input() is for strings. Using input() has certain risks since you can also enter a command and it will excute it.
Anyway, if you want to use
op = input(">")
then op will not be a string
and you have to use this if statement
if op == 1:
In the matter of fact, input() allows you to create this very simple calculator, since it evaluates mathematical expressions directly:
What 'slate' is really telling you is that input() is for numbers and raw_input() is for strings. Using input() has certain risks since you can also enter a command and it will excute it.
Anyway, if you want to use
op = input(">")
then op will not be a string
and you have to use this if statement
if op == 1:
In the matter of fact, input() allows you to create this very simple calculator, since it evaluates mathematical expressions directly:
python Syntax (Toggle Plain Text)
Last edited by sneekula; Jun 7th, 2008 at 11:23 am.
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