Autocomplete python/ namespace at the REPL (#788)

Fixes #787

Author: chrisrink10

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  * Added support for passing through `:tag` metadata to the generated Python AST (#354)
  * Added support for calling symbols as functions on maps and sets (#775)
  * Added support for passing command line arguments to Basilisp (#779)
+ * Added support for autocompleting names in the `python/` pseudo-namespace for Python builtins at the REPL (#787) 
 
 ### Changed
  * Optimize calls to Python's `operator` module into their corresponding native operators (#754)

src/basilisp/lang/runtime.py

@@ -1,5 +1,5 @@
 # pylint: disable=too-many-lines
-
+import builtins
 import contextlib
 import decimal
 import functools
@@ -867,7 +867,9 @@ def __complete_imports_and_aliases(
 
         candidates = filter(
             Namespace.__completion_matcher(prefix),
-            itertools.chain(aliases.items(), imports.items()),
+            itertools.chain(
+                aliases.items(), imports.items(), [(sym.symbol("python"), builtins)]
+            ),
         )
         if name_in_module is not None:
             for _, module in candidates: