fix python3 compatibility problem

app/doccano/doccano.py

@@ -1,5 +1,6 @@
 import argparse
 import os
+import sys
 import subprocess
 
 
@@ -19,19 +20,19 @@ def main():
     print('Setup Database.')
     base = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
     manage_path = os.path.join(base, 'manage.py')
-    subprocess.call(['python', manage_path, 'wait_for_db'], shell=False)
-    subprocess.call(['python', manage_path, 'migrate'], shell=False)
-    subprocess.call(['python', manage_path, 'create_roles'], shell=False)
+    subprocess.call([sys.executable, manage_path, 'wait_for_db'], shell=False)
+    subprocess.call([sys.executable, manage_path, 'migrate'], shell=False)
+    subprocess.call([sys.executable, manage_path, 'create_roles'], shell=False)
 
     print('Create admin user.')
-    subprocess.call(['python', manage_path, 'create_admin',
+    subprocess.call([sys.executable, manage_path, 'create_admin',
                      '--username', args.username,
                      '--password', args.password,
                      '--email', args.email,
                      '--noinput'], shell=False)
 
     print(f'Starting server with port {args.port}.')
-    subprocess.call(['python', manage_path, 'runserver', f'0.0.0.0:{args.port}'])
+    subprocess.call([sys.executable, manage_path, 'runserver', f'0.0.0.0:{args.port}'])
 
 
 if __name__ == '__main__':