diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
new file mode 100644
index 0000000..0695e93
--- /dev/null
+++ b/.github/workflows/run_tests.yml
@@ -0,0 +1,29 @@
+name: Python application
+
+on: [push]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.13
+      uses: actions/setup-python@v3
+      with:
+        python-version: "3.13"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install ruff
+        pip install pytest
+    - name: Lint with ruff
+      run: |
+        ruff check --output-format=github
+    - name: Test with pytest
+      run: |
+        pytest
\ No newline at end of file
diff --git a/walker_scheme/test_walker.py b/walker_scheme/test_walker.py
new file mode 100644
index 0000000..706f4cd
--- /dev/null
+++ b/walker_scheme/test_walker.py
@@ -0,0 +1,8 @@
+from walker import Walker
+
+
+def test():
+    test = Walker([("a", 0), ("b", 1)])
+    rand = test.get_random()
+    assert rand == 1
+
diff --git a/walker_scheme/walker.py b/walker_scheme/walker.py
new file mode 100644
index 0000000..0cdbc74
--- /dev/null
+++ b/walker_scheme/walker.py
@@ -0,0 +1,33 @@
+import random
+
+
+class Walker:
+    def __init__(self, probabilities: list[tuple[str, float]]):
+        self.probabilities = sorted(probabilities, key=lambda x: x[1])
+        self.probabilities_walker = [[self.probabilities[i][0], 1 / len(self.probabilities)] for i in range(len(self.probabilities))]
+        summa = sum(probabilities[i][1] for i in range(len(probabilities)))
+        if summa != 1:
+            raise ValueError('Сумма вероятностей не равна единице')
+
+    def walker_scheme(self):
+        barrier = 0
+        for i in range(len(self.probabilities) - 1):
+            if self.probabilities[i][1] < self.probabilities_walker[i][1]:
+                self.probabilities_walker[i][1] = self.probabilities[i][1] + barrier
+                self.probabilities_walker[i + 1][1] += (self.probabilities_walker[i][1] - self.probabilities[i][1])
+                barrier = self.probabilities_walker[i][1]
+            elif  self.probabilities[i][1] > self.probabilities_walker[i][1]:
+                self.probabilities_walker[i][1] = self.probabilities[i][1] + barrier
+                self.probabilities_walker[i + 1][1] -= (self.probabilities[i][1] - self.probabilities_walker[i][1])
+                barrier = self.probabilities_walker[i][1]
+            elif self.probabilities[i][1] == self.probabilities_walker[i][1]:
+                self.probabilities_walker[i][1] += barrier
+                barrier = self.probabilities_walker[i][1]
+        self.probabilities_walker[-1][1] += barrier
+
+    def get_random(self):
+        probability = random.random()
+        self.walker_scheme()
+        for i in self.probabilities_walker:
+            if probability <= i[1]:
+                return i[0]