Line indexing in Python

[seafoid]

Hi Guys,

When python reads in a file, can lines be referred to via an index?

Example:

for line in file:
     if line[0] == '0':
         a.write(line)

This works, however, I am unsure if line[0] refers only to the first line or
the first character in all lines.

Is there an easy way to refer to a line with the first character being a
single letter that you know?

Thanks in advance,
Seafoid.
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