diff --git a/.gitignore b/.gitignore
index b680166..08229e8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@ sandbox/
 
 # Byte-compiled / optimized / DLL files
 __pycache__/
+*_cache/
 *.py[cod]
 *$py.class
 
diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..306f58e
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,16 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Python: Current File",
+            "type": "python",
+            "request": "launch",
+            "program": "${file}",
+            "console": "integratedTerminal",
+            "justMyCode": true
+        }
+    ]
+}
\ No newline at end of file
diff --git a/.vscode/linux.env b/.vscode/linux.env
new file mode 100644
index 0000000..3781571
--- /dev/null
+++ b/.vscode/linux.env
@@ -0,0 +1,4 @@
+# linux
+PYTHONPATH = "/home/postgres/dhca/pyeit:/home/postgres/dhca/eitmesh:/home/postgres/dhca/pydhca"
+# Jupyter: run all cells
+# ctrl + alt + r
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..533f74f
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,12 @@
+{
+    "python.testing.unittestArgs": [
+        "-v",
+        "-s",
+        "./tests",
+        "-p",
+        "*test.py",
+        "test*.py",
+    ],
+    "python.testing.pytestEnabled": true,
+    "python.testing.unittestEnabled": false
+}
\ No newline at end of file
diff --git a/.vscode/windows.env b/.vscode/windows.env
new file mode 100644
index 0000000..ba939b4
--- /dev/null
+++ b/.vscode/windows.env
@@ -0,0 +1,4 @@
+# windows
+PYTHONPATH = "D:/dhca/pyeit;D:/dhca/eitmesh;D:/dhca/pydhca"
+# Jupyter: run all cells
+# ctrl + alt + r