builtin: added `__xonsh__.imp` to have an ability to import and use modules immediately in one line (#5595)

* imp

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* imp

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* imp

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: a <1@1.1>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

news/inline_import.rst

@@ -0,0 +1,25 @@
+**Added:**
+
+* builtin: added ``__xonsh__.imp`` to have an ability to import and use modules immediately in one line
+  e.g. ``__xonsh__.json.loads('{}')``.
+  In the future ``__xonsh__`` will have short notation ``@`` and the line will looks more elegant ``@.imp.json.loads('{}')``.
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>

xonsh/built_ins.py

@@ -520,6 +520,15 @@ def xonsh_builtins(execer=None):
     XSH.unload()
 
 
+class InlineImporter:
+    """Inline importer allows to import and use module attribute or function in one line."""
+
+    def __getattr__(self, name):
+        if name.startswith("__"):
+            return getattr(super(), name)
+        return __import__(name)
+
+
 class XonshSession:
     """All components defining a xonsh session."""
 
@@ -530,6 +539,7 @@ class XonshSession:
         self.history = None
         self.shell = None
         self.env = None
+        self.imp = InlineImporter()
         self.rc_files = None
 
         # AST-invoked functions