Fixed bug where pyscripts could edit cmd2.Cmd.py_locals dictionary.

Fixed bug where cmd2 set sys.path[0] for a pyscript to its cwd instead of the script's directory.
Fixed bug where sys.path was not being restored after a pyscript ran.
Setting the following pyscript variables:
    __name__: __main__
    __file__: script path (as typed)
Removed do_py.run() function since it didn't handle arguments and offered no benefit over run_pyscript.

4 files changed, 21 insertions, 8 deletions

diff --git a/tests/pyscript/environment.py b/tests/pyscript/environment.py
new file mode 100644
index 00000000..5e4d93d6
--- /dev/null
+++ b/tests/pyscript/environment.py
@@ -0,0 +1,20 @@
+# flake8: noqa F821
+# Tests that cmd2 populates __name__, __file__, and sets sys.path[0] to our directory
+import os
+import sys
+app.cmd_echo = True
+
+if __name__ != '__main__':
+    print("Error: __name__ is: {}".format(__name__))
+    quit()
+
+if __file__ != sys.argv[0]:
+    print("Error: __file__ is: {}".format(__file__))
+    quit()
+
+our_dir = os.path.dirname(os.path.abspath(__file__))
+if our_dir != sys.path[0]:
+    print("Error: our_dir is: {}".format(our_dir))
+    quit()
+
+print("PASSED")
diff --git a/tests/pyscript/recursive.py b/tests/pyscript/recursive.py
index 21550592..7f02bb78 100644
--- a/tests/pyscript/recursive.py
+++ b/tests/pyscript/recursive.py
@@ -5,6 +5,7 @@
 Example demonstrating that calling run_pyscript recursively inside another Python script isn't allowed
 """
 import os
+import sys
 
 app.cmd_echo = True
 my_dir = (os.path.dirname(os.path.realpath(sys.argv[0])))
diff --git a/tests/pyscript/run.py b/tests/pyscript/run.py
deleted file mode 100644
index 47250a10..00000000
--- a/tests/pyscript/run.py
+++ /dev/null
@@ -1,6 +0,0 @@
-# flake8: noqa F821
-import os
-
-app.cmd_echo = True
-my_dir = (os.path.dirname(os.path.realpath(sys.argv[0])))
-run(os.path.join(my_dir, 'to_run.py'))
diff --git a/tests/pyscript/to_run.py b/tests/pyscript/to_run.py
deleted file mode 100644
index b207952d..00000000
--- a/tests/pyscript/to_run.py
+++ /dev/null
@@ -1,2 +0,0 @@
-# flake8: noqa F821
-print("I have been run")