Rather than patch your code, I think you should see a better approach.
from textwrap import dedent # removes common whitespace prefix
lines = []
def add_header(ss):
"Add header to sequence of string lines"
ss.append(dedent("""\ # No initial blank line
my multi-line
string here
"""))
def add_more(ss):
"Add more to sequence of string lines"
ss.append(dedent(""" # Start with blank line
another
multi-line
string here
"""))
add_header(lines)
add_more(lines)
print(''.join(lines)) # prints
--------------------------------
my multi-line
string here
another
multi-line
string here
--------------------------------
PS. Only use 'gen' for naming generator functions when you get to them.
--
Terry Jan Reedy
--
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