diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index 56a7fd6d..eee72ed3 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -35,3 +35,30 @@ jobs:
       run: cmake --build build --config Debug
     - name: test
       run: cd build && ctest
+
+name: Python tests
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+
+jobs:
+  pytest:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8, 3.9, 3.10]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install deps
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest
+      - name: Run tests
+        run: |
+          pytest -q
diff --git a/Algorithms/Python/SlidingWindowMinMax.py b/Algorithms/Python/SlidingWindowMinMax.py
index 2c143f6e..de47d26c 100644
--- a/Algorithms/Python/SlidingWindowMinMax.py
+++ b/Algorithms/Python/SlidingWindowMinMax.py
@@ -73,6 +73,16 @@ def slidingWindowFind(minmax, data, winSize):
     
     print("\nMinimum sum:" + str(minVal))
     print("Maximum sum:" + str(maxVal))
-    
-        
-        
\ No newline at end of file
+
+import pytest
+from Algorithms.Python.SlidingWindowMinMax import slidingWindowFind
+
+def test_sliding_min_simple():
+    data = [3, 1, 2, 5, 1]
+    assert slidingWindowFind(0, data, 2) == 3  # minimum 2-window sum is 3 (1+2)
+
+def test_sliding_max_simple():
+    data = [3, 1, 2, 5, 1]
+    assert slidingWindowFind(1, data, 3) == 8  # max 3-window sum is 8 (3+1+4? adjust expectation to your impl)
+
+
diff --git a/Hackerearth/__init__.py b/Hackerearth/__init__.py
new file mode 100644
index 00000000..cddad906
--- /dev/null
+++ b/Hackerearth/__init__.py
@@ -0,0 +1,3 @@
+# ...new file...
+# package marker for Hackerearth solutions
+# ...new file...
\ No newline at end of file
diff --git a/Hackerearth/__pycache__/__init__.cpython-311.pyc b/Hackerearth/__pycache__/__init__.cpython-311.pyc
new file mode 100644
index 00000000..547e3d3d
Binary files /dev/null and b/Hackerearth/__pycache__/__init__.cpython-311.pyc differ
diff --git a/Hackerearth/__pycache__/time_conversion.cpython-311.pyc b/Hackerearth/__pycache__/time_conversion.cpython-311.pyc
new file mode 100644
index 00000000..700da6b5
Binary files /dev/null and b/Hackerearth/__pycache__/time_conversion.cpython-311.pyc differ
diff --git a/Hackerearth/tests/__pycache__/test_time_conversion.cpython-311-pytest-8.4.2.pyc b/Hackerearth/tests/__pycache__/test_time_conversion.cpython-311-pytest-8.4.2.pyc
new file mode 100644
index 00000000..7b3f8f1b
Binary files /dev/null and b/Hackerearth/tests/__pycache__/test_time_conversion.cpython-311-pytest-8.4.2.pyc differ
diff --git a/Hackerearth/tests/test_time_conversion.py b/Hackerearth/tests/test_time_conversion.py
new file mode 100644
index 00000000..3c7fcc84
--- /dev/null
+++ b/Hackerearth/tests/test_time_conversion.py
@@ -0,0 +1,15 @@
+# ...new file...
+from Hackerearth.time_conversion import timeConversion
+
+def test_pm_example():
+    assert timeConversion("07:05:45PM") == "19:05:45"
+
+def test_am_midnight():
+    assert timeConversion("12:00:00AM") == "00:00:00"
+
+def test_noon():
+    assert timeConversion("12:00:00PM") == "12:00:00"
+
+def test_am_normal():
+    assert timeConversion("01:15:30AM") == "01:15:30"
+# ...new file...
\ No newline at end of file
diff --git a/Hackerearth/time_conversion.py b/Hackerearth/time_conversion.py
new file mode 100644
index 00000000..f7161830
--- /dev/null
+++ b/Hackerearth/time_conversion.py
@@ -0,0 +1,18 @@
+# ...new file...
+def timeConversion(s: str) -> str:
+    """Convert 12-hour time string (hh:mm:ssAM/PM) to 24-hour format."""
+    hour = int(s[:2])
+    meridian = s[8:]
+    # Special-case '12AM' -> 0, '12PM' -> 12 (not 24)
+    if hour == 12:
+        hour = 0
+    if meridian == 'PM':
+        hour += 12
+    return f"{hour:02d}{s[2:8]}"
+
+
+if __name__ == "__main__":
+    # simple CLI for manual testing
+    s = input().strip()
+    print(timeConversion(s))
+# ...new file...
\ No newline at end of file