diff --git a/2020-python/inputs/day_25 b/2020-python/inputs/day_25
new file mode 100644
index 0000000..fe7ecff
--- /dev/null
+++ b/2020-python/inputs/day_25
@@ -0,0 +1,2 @@
+1614360
+7734663
diff --git a/2020-python/solutions/day_25.py b/2020-python/solutions/day_25.py
new file mode 100644
index 0000000..26c9bd3
--- /dev/null
+++ b/2020-python/solutions/day_25.py
@@ -0,0 +1,52 @@
+"""AOC 2020 Day 25"""
+
+import pathlib
+import time
+
+TEST_INPUT = """5764801
+17807724"""
+
+def read_input(input_path: str) -> str:
+    """take input file path and return a str with the file's content"""
+    with open(input_path, 'r') as input_file:
+        input_data = input_file.read().strip()
+        return input_data
+
+def extract(input_data: str) -> tuple:
+    """take input data and return the appropriate data structure"""
+    return tuple(map(int, input_data.splitlines()))
+
+def part1(entries: tuple) -> int:
+    """part1 solver"""
+    card_key, door_key = entries
+    loop_size = 0
+    key = 1
+    while key not in (card_key, door_key):
+        loop_size += 1
+        key = (key * 7) % 20201227
+
+    if key == card_key:
+        return pow(door_key, loop_size, 20201227)
+    return pow(card_key, loop_size, 20201227)
+
+def test_input_day_25():
+    """pytest testing function"""
+    entries = extract(TEST_INPUT)
+    assert part1(entries) == 14897079
+
+def test_bench_day_25(benchmark):
+    """pytest-benchmark function"""
+    benchmark(main)
+
+def main():
+    """main function"""
+    input_path = str(pathlib.Path(__file__).resolve().parent.parent) + "/inputs/" + str(pathlib.Path(__file__).stem)
+    start_time = time.time()
+    input_data = read_input(input_path)
+    entries = extract(input_data)
+    print("Part 1: %s" % part1(entries))
+    end_time = time.time()
+    print("Execution time: %f" % (end_time-start_time))
+
+if __name__ == "__main__":
+    main()
diff --git a/README.md b/README.md
index 7a5bdf4..9a849dc 100644
--- a/README.md
+++ b/README.md
@@ -34,3 +34,4 @@
 | [Day 22](https://adventofcode.com/2020/day/22) | [1.516s](./2020-python/solutions/day_22.py)    | [1.353s](./2020-python/solutions/day_22.py)    |
 | [Day 23](https://adventofcode.com/2020/day/23) | [14.754s](./2020-python/solutions/day_23.py)   | [3.572s](./2020-python/solutions/day_23.py)    |
 | [Day 24](https://adventofcode.com/2020/day/24) | [753.985ms](./2020-python/solutions/day_24.py) | [357.455ms](./2020-python/solutions/day_24.py) |
+| [Day 25](https://adventofcode.com/2020/day/25) | [144.685ms](./2020-python/solutions/day_25.py) | [4.184ms](./2020-python/solutions/day_25.py)   |