On 25/03/14 19:21, Saad Bashir wrote:
As per its instructions I am using the IDLE environment (Python shell)
of Python [3.2.3 MSC v.1500 64 bit AMD64]. I have been going through
the book without any problems but have become stuck at the following stage:
When using "if" and "elif" statement I get two types of error messages:
1. Practicing the code as given in the book:
>>> ph = float(input('Enter the pH level: '))
Enter the pH level: 8.5
>>> if ph < 7.0:
... print(ph, "is acidic.")
... elif ph > 7.0:
... print(ph, "is basic.")
When I write this in the Python shell, as soon as I hit return after
"elif ph > 7.0:"
I get an error message highlighting "elif" and saying syntax error.
Or if I try the indentation as follows with elif aligned if above I get
the message below:
>>> ph = float(input('Enter the pH level: '))
Enter the pH level: 8.5
>>> if ph < 7.0:
... print(ph, "is acidic.")
... elif ph > 7.0:
... print(ph, "is basic.")
"SyntaxError: : unindent does not match any outer indentation level.
Do you actually get the three dots in your IDLE? I don't in mine...
And thats important because in my IDLE I have to align my indentation
with the left margin rather than the code above.
So your code would look like:
>>> if ph < 7.0:
print(ph, "is acidic.")
elif ph > 7.0:
print(ph, "is basic.")
in my IDLE.
That's pretty ugly and I wish the IDLE guys would fix it but
it's been that way for a long time.
Basically you have to pretend the first line started on
the left margin...
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.flickr.com/photos/alangauldphotos
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