"""Indents blank lines that would otherwise cause early compilation

lines = s.split('\n')

ends_with_newline = False

if lines and not lines[-1]:

ends_with_newline = True

lines.pop()

result_lines = []

for p_line, line, n_line in zip([''] + lines[:-1], lines,

lines[1:] + ['']):

if len(line) == 0:

p_indent = indent_empty_lines_re.match(p_line).group()

n_indent = indent_empty_lines_re.match(n_line).group()

result_lines.append(min([p_indent, n_indent], key=len) + line)

else:

result_lines.append(line)

lines = s.split('\n')

result_lines = []

tab_to_space = lambda m: len(m.group()) * 4 * ' '

for line in lines:

result_lines.append(tabs_to_spaces_re.sub(tab_to_space, line))