[Tutor] help with inch to cms conversion .

Dave Angel davea at davea.name
Mon Feb 11 17:25:01 CET 2013

On 02/11/2013 11:06 AM, Pravya Reddy wrote:
> Can you please help me with the code.
> #!/usr/bin/env python
> """
> inchtocm.py
> """

First, remove that try/except until the code is free of obvious bugs. 
It's masking where the error actually occurs.  Alternatively, include a 
variable there, and print the stack trace yourself.

> def Inchtocm(inches):
>      """Returns 2.54 * inches"""
>      return (2.54 * float(inches_number1))

As Joel pointed out, you're using a global instead of the parameter that 
was passed.  Call float() on  inches, not on some non-local variable.

> inches = None
> while True:
>      try:
>          inches_number1 = input(input("How many inches you want to convert:
> "))

Calling input(input())  doesn't do any favors.  It echoes the first 
response, and waits for another one.  The user doesn't probably realize 
that he has to type the number 455 twice.

>          inches = float(inches_number1)

Since you're presumably getting the exception on this line, you should 
print out the value you're trying to convert.  You can remove the print 
after it works.

>          print ("You got", Inchtocm(inches), "cm.")
>          print ("You converted", inches, "inches to cm.")
>          break
>      except ValueError:
>          print ("This is not a number!")
> The code is incomplete and i am not getting a proper output:
> How many inches you want to convert: 455
> 455
> This is not a number!
> How many inches you want to convert:

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