обавлены data.txt и script.py

python_env_practice/.gitignore

@@ -0,0 +1,4 @@
+.venv/
+__pycache__/
+*.pyc
+output.txt

python_env_practice/data.txt

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+Иванов
+Петров
+Сидоров

python_env_practice/script.py

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+with open('data.txt', 'r', encoding='utf-8') as f:
+    lines = f.readlines()
+
+with open('output.txt', 'w', encoding='utf-8') as f:
+    for line in lines:
+        f.write(line.strip().upper() + '\n')
+
+print("Готово, результат в output.txt")