exercise 7

Author: ErmiasBahru

2. os/exercise 7/README.md

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+# Exercise 7
+
+Using the built-in os module create a directory called `images`. Then create two directories in this directory named `images_png` and `images_jpg`. Before creating each directory, check if such directory exists.
+
+```python exercise.py
+import os
+
+base_dir = 'images'
+
+# add your solution here
+
+for root, dirs, files in os.walk(base_dir):
+    print(root)
+
+```
+
+## Expected result
+
+```cmd
+images
+images/images_jpg
+images/images_png
+```

2. os/exercise 7/exercise.py

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+import os
+
+
+base_dir = 'images'
+
+# add your solution here
+
+for root, dirs, files in os.walk(base_dir):
+    print(root)

2. os/exercise 7/solution.py

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+import os
+
+base_dir = 'images'
+
+# add your solution here
+
+png_dir = os.path.join(base_dir, 'images_png')
+jpg_dir = os.path.join(base_dir, 'images_jpg')
+
+if not os.path.exists(base_dir):
+    os.mkdir(base_dir)
+
+if not os.path.exists(png_dir):
+    os.mkdir(png_dir)
+
+if not os.path.exists(jpg_dir):
+    os.mkdir(jpg_dir)
+
+for root, dirs, files in os.walk(base_dir):
+    print(root)