[Tutor] Open a text file, read and print pattern matching

[ALAN GAULD]

> thanks this solve the error but running the code produces another error ie 
>index out of range.
>     if line[3] == pattern:
> IndexError: list index out of range

So you need to check that there are at least 4 elements in the line before
trying to access it. Or else catch the exception (see my other post about 
unpacking the data)

HTH,

Alan G.
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