def get_data():
with open(data_file, 'r') as file:
lines = file.readlines()
if lines:
data = lines[0].strip()
with lock:
with open(data_file, 'w') as file:
file.writelines(lines[1:])
return data
else:
return None
@app.route('/')
def index():
return get_data() or 'No data available'