[Tutor] Out of range

[Gregor Lingl]

Adam Vardy schrieb:

>Someone have any suggestions on this index error?
>
>IndexError: string index out of range
>SyntaxError: invalid syntax
>  
>
>>>>print index
>>>>        
>>>>
>Traceback (most recent call last):
>  File "<pyshell#75>", line 1, in ?
>    print index
>NameError: name 'index' is not defined
>  
>
>
>  
>
You report us three Errors. The last one is clear (for me),
as there is no name index in Python (unless you define it).
In Python index is a method either of string or of list objects:

 >>> "abcde".index("c")
2
 >>> [1,2,3,4,5].index(4)
3

What are the situations, where the other two occur?
The first on is easy to imagine:

 >>> a = "hey!"
 >>> a[4]
Traceback (most recent call last):
  File "<pyshell#10>", line 1, in ?
    a[4]
IndexError: string index out of range

This occurs because ...

 >>> for c in a:
    c, a.index(c)

   
('h', 0)
('e', 1)
('y', 2)
('!', 3)
 >>>

There is no character with index 4 in "hey!"

Only from knowing that a SyntaxError occured,
it's impossible to imagine what it possibly caused ...

Regards, Gregor