<filename>3_advanced/chapter20/practice/shelve_practice_2.py
# Use mydb.db . Using it, first create a total variable. Then, add
# all of the shelve’s values to the total. Remember to check if
# the value is an integer before adding it to the total.
# After all, shelves can store all types.

<filename>3_advanced/chapter20/practice/shelve_practice_2.py
# Use mydb.db . Using it, first create a total variable. Then, add
# all of the shelve’s values to the total. Remember to check if
# the value is an integer before adding it to the total.
# After all, shelves can store all types.

# Use mydb.db . Using it, first create a total variable. Then, add # all of the shelve’s values to the total. Remember to check if # the value is an integer before adding it to the total. # After all, shelves can store all types.