Merge from 3.x: PR #4992

Fixes #3529

Author: ccordoba12

Diff for: spyder/utils/site/sitecustomize.py

@@ -195,6 +195,21 @@ def execfile(filename, namespace):
     HAS_CYTHON = False
 
 
+#==============================================================================
+# Prevent subprocess.Popen calls to create visible console windows on Windows.
+# See issue #4932
+#==============================================================================
+if os.name == 'nt':
+    import subprocess
+    creation_flag = 0x08000000  # CREATE_NO_WINDOW
+
+    class SubprocessPopen(subprocess.Popen):
+        def __init__(self, *args, **kwargs):
+            kwargs['creationflags'] = creation_flag
+            super(SubprocessPopen, self).__init__(*args, **kwargs)
+
+    subprocess.Popen = SubprocessPopen
+
 #==============================================================================
 # Importing user's sitecustomize
 #==============================================================================
@@ -227,7 +242,6 @@ def _getfilesystemencoding_wrapper():
     except:
         pass
 
-
 #==============================================================================
 # This prevents a kernel crash with the inline backend in our IPython
 # consoles on Linux and Python 3 (Fixes Issue 2257)