Issue2

notebook/context manager/hands_on/1_microscope_script.py

@@ -4,15 +4,22 @@
     connect_to_microscope,  # Connect to microscope and get a state object
     release_microscope,
 
-    activate_vacuum_pump,  # Make vacuum inside the microscope 
+    activate_vacuum_pump,  # Make vacuum inside the microscope
     deactivate_vacuum_pump,
-    
+
     insert_sample,  # Insert sample for scanning
     remove_sample,
-    
+
     calibrate,  # Calibrate microscope
     scan_sample,  # Scan sample currently in the microscope
 )
+@contextmanager
+def sample_inserted(microscope_state):
+    insert_sample(microscope_state)
+    try:
+        yield
+    finally:
+        remove_sample(microscope_state)
 
 
 @contextmanager
@@ -26,21 +33,16 @@ def do_stuff_under_vacuum(microscope_state):
 
 
 # Write here the `sample_inserted` context manager that inserts a sample
-# in the microscope before executing a block of code, and safely removes 
+# in the microscope before executing a block of code, and safely removes
 # it at the end of the block.
 
 
 # Rewrite this script using the two context managers.
 microscope_state = connect_to_microscope()
 
-activate_vacuum_pump(microscope_state)
-try:
-    insert_sample(microscope_state)
-    try:
+with do_stuff_under_vacuum(microscope_state):
+    with sample_inserted(microscope_state):
         sample_image = scan_sample(microscope_state)
-    finally:
-        remove_sample(microscope_state)
-finally:
-    deactivate_vacuum_pump(microscope_state)
+
 
 release_microscope(microscope_state)

notebook/generators/hands_on/recognize_smell.py

@@ -0,0 +1,16 @@
+def generator_useful(n,divider):
+    """Wonderful comments"""
+
+    for i in range(n):
+        if i % divider == 0:
+            continue
+        yield i
+
+for i in generator_useful(9,3):
+    print('Square is', i ** 2)
+
+for i in generator_useful(5,2):
+    print('Cube is', i ** 3)
+
+for i in generator_useful(13,5):
+    print('A' * i)