A little Python question

[C++buntu]

Hi everyone,

I'm puzzled, I'm new to programming but I work my way up with Python. I have a question for the guru's out there.

There's my code:



# Filename: convert_temp.py
def C2F(C):
""" C2F(C) convert a Celsius to a Fahrenheit temperature.

Input: C: Celsius degree.
Output: F: Fahrenheit degree.

Example: >>> C2F(0)
32.0
"""
if C < -273.15:
raise ValueError('C = %g is a non-physical value.' % C)
else:
value = (9./5)*C + 32
return value
Now, when I run this in IPython, I obtain the following:



In [1]: from convert_temp import *

In [2]: C2F(0)
Out[2]: 32.0

In [3]: C2F(-400)
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (38, 0))

---------------------------------------------------------------------------
ValueError Traceback (most recent call last)

/home/steeve/Py4cs/problems/chapter 03/<ipython console> in <module>()

/home/steeve/Py4cs/problems/chapter 03/convert_temp.pyc in C2F(C)
16 """
17 if C < -273.15:
---> 18 raise ValueError('C = %g is a non-physical value.' % C)
19 else:
20 value = (9./5)*C + 32

ValueError: C = -400 is a non-physical value.
Any help for my error?

Thanks,

C++buntu

[diesch]

Works for me:


In [1]: from convert_temp import *

In [2]: C2F(0)
Out[2]: 32.0

In [3]: C2F(-400)
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)

/home/diesch/<ipython console> in <module>()

/home/diesch/convert_temp.py in C2F(C)
10 """
11 if C < -273.15:
---> 12 raise ValueError('C = %g is a non-physical value.' % C)
13 else:
14 value = (9./5)*C + 32

ValueError: C = -400 is a non-physical value.



The line numbers suggest that the file you are using contains not only the code you've given. I guess that the problem is caused by this extra lines.

[Axos]

I plead ignorance about IPython but I ran your program using ordinary python and it seemed to work fine (I used the file name "c2f.py", thus the "import c2f"):

Python 2.6.4 (r264:75706, Dec 7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import c2f
>>> c2f.C2F(0)
32.0
>>> c2f.C2F(-400)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "c2f.py", line 12, in C2F
raise ValueError('C = %g is a non-physical value.' % C)
ValueError: C = -400 is a non-physical value.

[C++buntu]

Thanks for the reply, I will comment my other lines of code in the file to check where the error comes from.

Cheers,

Danke

[nvteighen]

Hm... My guess is that you've got a tab/space mix... or that you edited the code in Windows or Mac.