import os
import re

with open('core/views.py', 'r') as f:
    content = f.read()

# Find the first occurrence of return render(request, 'core/log_door_visit.html', context)
# and the next def door_visit_history(request):
pattern = r"(return render\(request, 'core/log_door_visit.html', context\)).*?(def door_visit_history\(request\):)"
new_content = re.sub(pattern, r"\1\n\n\2", content, flags=re.DOTALL)

with open('core/views.py', 'w') as f:
    f.write(new_content)