ENGR 102 EXAM 2 fully solved & updated 2025-2026(latest
version verified for accuracy) | 2024\2025Latest!!
1. List 5 good coding practices that have been mentioned in this course. - Answer: # Q1
# always comment your code
# keep your code simple
# test your code often, work through it in groups
# be consistent with your code
# use good identifying variables
# write as few of lines as possible
2. In the following dictionary, identify the keys and values. Write the command to add the items
'Orange' and 1 to the dictionary. What does the command print(mydict.items()) output to the
console? mydict = {'Apple' : 3, 'Pear' : 5, 'Banana' : 2} - Answer: # Q2
mydict = {'Apple' : 3, 'Pear' : 5, 'Banana' : 2}
mydict['Orange'] = 1
print(mydict.items()) # prints items as list
print(mydict) # **** whats diff ??? ****
# cannot do this, a dictionary does not have append or add
# mydict.append("'Orange' : 1")
3. Explain how dictionaries are different from lists, and how lists are different from tuples. -
Answer: # Q3
# dictionaries are a table of key values while a list
# is an ordered collection of items
# lists are mutable, tuples are not
4. Identify and explain 3 ways strings are similar to lists - Answer: # Q4
# are similar bc both are used to store data and are a collection of items
,ENGR 102 EXAM 2 fully solved & updated 2025-2026(latest
version verified for accuracy) | 2024\2025Latest!!
5. List all of the data types we have seen in this course and provide an example of each. Identify
which ones are mutable and which are immutable. - Answer: # Q5
# integers : 9 : immutable
# floating-point : 2.9 : immutable
# tuples/ strings : "" : immutable
# lists/ dictionaries : [] {} : mutable
6. In your own words, explain the difference between the top-down and bottom-up design
methods. Name at least one advantage and one disadvantage for each. - Answer: # Q6
# Top down programming, in simple terms, is dividing
# and conquering a problem, Bottum-up programming is
# used when you're not sure where to start your code
7. Describe the various components of a hierarchy. How can we use one in program design? -
Answer: # Q7
# A hierarchy is an organized structure where items are
# ranked based on level of importance. As the tree
# descends, the tasks become less important.
8. What type of coding error do you hate the most and why? - Answer: # Q8
# Syntax Errors occur when the program contains invalid code that cannot be understood.
# Indentation Errors occur when the lines of a program are not properly indented.
# Value Errors occur when an invalid value is used - can occur if letters are given to int().
# Name Errors occur when the program tries to use a variable that does not exist.
, ENGR 102 EXAM 2 fully solved & updated 2025-2026(latest
version verified for accuracy) | 2024\2025Latest!!
# Type Errors occur when an operation uses incorrect types - can occur if adding an integer to a
string.
9. When you are trying to fix your code, what are some alternatives to using a debugger? -
Answer: # Q9
# starting with a visual inspection can be helpful
# the try and excpect method aka guess and check
# method is helpful to check blocks of code
10. When would it be best to use the myfile = open(...) / myfile.close() commands for opening
files as opposed to the with open(...) as myfile: command? - Answer: # Q10
### option 1
myfile = open()
x=1
myfile.close()
### option 2
with open() as myfile:
meow = 1
# option 2 is better because it is less lines of code
11. When opening files, what is the difference between the designators r, w, r+, and a? -
Answer: # Q11
# r = read
# w = write
# a = append
version verified for accuracy) | 2024\2025Latest!!
1. List 5 good coding practices that have been mentioned in this course. - Answer: # Q1
# always comment your code
# keep your code simple
# test your code often, work through it in groups
# be consistent with your code
# use good identifying variables
# write as few of lines as possible
2. In the following dictionary, identify the keys and values. Write the command to add the items
'Orange' and 1 to the dictionary. What does the command print(mydict.items()) output to the
console? mydict = {'Apple' : 3, 'Pear' : 5, 'Banana' : 2} - Answer: # Q2
mydict = {'Apple' : 3, 'Pear' : 5, 'Banana' : 2}
mydict['Orange'] = 1
print(mydict.items()) # prints items as list
print(mydict) # **** whats diff ??? ****
# cannot do this, a dictionary does not have append or add
# mydict.append("'Orange' : 1")
3. Explain how dictionaries are different from lists, and how lists are different from tuples. -
Answer: # Q3
# dictionaries are a table of key values while a list
# is an ordered collection of items
# lists are mutable, tuples are not
4. Identify and explain 3 ways strings are similar to lists - Answer: # Q4
# are similar bc both are used to store data and are a collection of items
,ENGR 102 EXAM 2 fully solved & updated 2025-2026(latest
version verified for accuracy) | 2024\2025Latest!!
5. List all of the data types we have seen in this course and provide an example of each. Identify
which ones are mutable and which are immutable. - Answer: # Q5
# integers : 9 : immutable
# floating-point : 2.9 : immutable
# tuples/ strings : "" : immutable
# lists/ dictionaries : [] {} : mutable
6. In your own words, explain the difference between the top-down and bottom-up design
methods. Name at least one advantage and one disadvantage for each. - Answer: # Q6
# Top down programming, in simple terms, is dividing
# and conquering a problem, Bottum-up programming is
# used when you're not sure where to start your code
7. Describe the various components of a hierarchy. How can we use one in program design? -
Answer: # Q7
# A hierarchy is an organized structure where items are
# ranked based on level of importance. As the tree
# descends, the tasks become less important.
8. What type of coding error do you hate the most and why? - Answer: # Q8
# Syntax Errors occur when the program contains invalid code that cannot be understood.
# Indentation Errors occur when the lines of a program are not properly indented.
# Value Errors occur when an invalid value is used - can occur if letters are given to int().
# Name Errors occur when the program tries to use a variable that does not exist.
, ENGR 102 EXAM 2 fully solved & updated 2025-2026(latest
version verified for accuracy) | 2024\2025Latest!!
# Type Errors occur when an operation uses incorrect types - can occur if adding an integer to a
string.
9. When you are trying to fix your code, what are some alternatives to using a debugger? -
Answer: # Q9
# starting with a visual inspection can be helpful
# the try and excpect method aka guess and check
# method is helpful to check blocks of code
10. When would it be best to use the myfile = open(...) / myfile.close() commands for opening
files as opposed to the with open(...) as myfile: command? - Answer: # Q10
### option 1
myfile = open()
x=1
myfile.close()
### option 2
with open() as myfile:
meow = 1
# option 2 is better because it is less lines of code
11. When opening files, what is the difference between the designators r, w, r+, and a? -
Answer: # Q11
# r = read
# w = write
# a = append
