GH1061 add calamine literal to ExcelFile engine (#1062)

* GH1061 add calamine literal to ExcelFile engine

* fix format

Author: sanzoghenzo

pandas-stubs/io/excel/_base.pyi

@@ -246,7 +246,7 @@ class ExcelFile:
     def __init__(
         self,
         io: FilePath | ReadBuffer[bytes] | bytes,
-        engine: Literal["xlrd", "openpyxl", "odf", "pyxlsb"] | None = ...,
+        engine: ExcelReadEngine | None = ...,
         storage_options: StorageOptions = ...,
     ) -> None: ...
     def __fspath__(self): ...

tests/test_io.py

@@ -1109,6 +1109,14 @@ def test_read_excel_dtypes():
         check(assert_type(read_excel(path, dtype=dtypes), pd.DataFrame), pd.DataFrame)
 
 
+def test_excel_reader():
+    with ensure_clean(".xlsx") as path:
+        check(assert_type(DF.to_excel(path), None), type(None))
+        with pd.ExcelFile(path, engine="calamine") as ef:
+            check(assert_type(ef, pd.ExcelFile), pd.ExcelFile)
+            check(assert_type(pd.read_excel(ef), pd.DataFrame), pd.DataFrame)
+
+
 def test_excel_writer():
     with ensure_clean(".xlsx") as path:
         with pd.ExcelWriter(path) as ew: