fix: compatibility for Python 2.7

httprunner/compat.py

@@ -47,6 +47,7 @@ if is_py2:
     integer_types = (int, long)
 
     FileNotFoundError = IOError
+    import StringIO as io
 
 elif is_py3:
     builtin_str = str
@@ -57,3 +58,4 @@ elif is_py3:
     integer_types = (int,)
 
     FileNotFoundError = FileNotFoundError
+    import io as io

tests/test_cli.py

@@ -1,8 +1,8 @@
-import io
 import sys
 import unittest
 
 from httprunner.cli import main
+from httprunner.compat import io
 
 
 class TestCli(unittest.TestCase):