REGR: show_versions (#32041)

Author: simonjayhawkins

Diff for: pandas/tests/test_optional_dependency.py

@@ -22,12 +22,12 @@ def test_xlrd_version_fallback():
     import_optional_dependency("xlrd")
 
 
-def test_bad_version():
+def test_bad_version(monkeypatch):
     name = "fakemodule"
     module = types.ModuleType(name)
     module.__version__ = "0.9.0"
     sys.modules[name] = module
-    VERSIONS[name] = "1.0.0"
+    monkeypatch.setitem(VERSIONS, name, "1.0.0")
 
     match = "Pandas requires .*1.0.0.* of .fakemodule.*'0.9.0'"
     with pytest.raises(ImportError, match=match):
@@ -42,11 +42,11 @@ def test_bad_version():
     assert result is module
 
 
-def test_no_version_raises():
+def test_no_version_raises(monkeypatch):
     name = "fakemodule"
     module = types.ModuleType(name)
     sys.modules[name] = module
-    VERSIONS[name] = "1.0.0"
+    monkeypatch.setitem(VERSIONS, name, "1.0.0")
 
     with pytest.raises(ImportError, match="Can't determine .* fakemodule"):
         import_optional_dependency(name)

Diff for: pandas/tests/util/test_show_versions.py

@@ -0,0 +1,22 @@
+import re
+
+import pandas as pd
+
+
+def test_show_versions(capsys):
+    # gh-32041
+    pd.show_versions()
+    captured = capsys.readouterr()
+    result = captured.out
+
+    # check header
+    assert "INSTALLED VERSIONS" in result
+
+    # check full commit hash
+    assert re.search(r"commit\s*:\s[0-9a-f]{40}\n", result)
+
+    # check required dependency
+    assert re.search(r"numpy\s*:\s([0-9\.\+a-f]|dev)+\n", result)
+
+    # check optional dependency
+    assert re.search(r"pyarrow\s*:\s([0-9\.]+|None)\n", result)

Diff for: pandas/util/_print_versions.py

@@ -118,10 +118,10 @@ def show_versions(as_json=False):
         print("\nINSTALLED VERSIONS")
         print("------------------")
         for k, stat in sys_info:
-            print(f"{{k:<{maxlen}}}: {{stat}}")
+            print(f"{k:<{maxlen}}: {stat}")
         print("")
         for k, stat in deps_blob:
-            print(f"{{k:<{maxlen}}}: {{stat}}")
+            print(f"{k:<{maxlen}}: {stat}")
 
 
 def main() -> int: