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context managers for microscope #16

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context managers for microscope #16

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29 changes: 20 additions & 9 deletions notebook/context manager/hands_on/1_microscope_script.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,13 @@ def do_stuff_under_vacuum(microscope_state):
finally:
deactivate_vacuum_pump(microscope_state)

@contextmanager
def sample_inserted(microscope_state):
insert_sample(microscope_state)
try:
yield # sample_image = scan_sample(microscope_state)
finally:
remove_sample(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
Expand All @@ -33,14 +40,18 @@ def do_stuff_under_vacuum(microscope_state):
# Rewrite this script using the two context managers.
microscope_state = connect_to_microscope()

activate_vacuum_pump(microscope_state)
try:
insert_sample(microscope_state)
try:
sample_image = scan_sample(microscope_state)
finally:
remove_sample(microscope_state)
finally:
deactivate_vacuum_pump(microscope_state)
with do_stuff_under_vacuum(microscope_state):
with sample_inserted(microscope_state):
sample_image = scan_sample(microscope_state)

# activate_vacuum_pump(microscope_state)
#try:
# insert_sample(microscope_state)
# try:
# sample_image = scan_sample(microscope_state)
# finally:
# remove_sample(microscope_state)
#finally:
# deactivate_vacuum_pump(microscope_state)

release_microscope(microscope_state)