CSE 102 Exam 3 Practice

What is the correct way to open a file for reading in Python? (Assume there is a variable filename that contains the filename)

• open(filename, 'r')

• open(filename, 'w')

• with open(filename, 'r') as openFile:

• with open(filename, 'r')

What is the correct syntax to define a user-defined function in Python?

• function myFunction():

• def myFunction():

• create myFunction():

• define myFunction():

For the following function, what are the parameters? (select all that apply)

• val1

• val2

• val3

• val4

• val5

Which of the following is a valid way to create a dictionary in Python?

• my_dict = {1, 2}

• my_dict = [1: 'a', 2: 'b']

• my_dict = {'a': 1, 'b': 2}

• my_dict = {'a' =1, 'b' = 2}

Which function can be used to skip (and if desired gather) a row in a csv file.

• next()

• skip()

• pass()

• read()

How do you read all lines from a text file into a list in Python?

• file.readlines()

• file.read()

• file.readlist()

• file.read_all()

What is the correct way to update a value in a dictionary?

• 
• 
• 
• 

What is the difference between parameters and arguments?

• Arguments are the placeholders in the function definition and parameters are the values passed to the function when it is called.

• Parameters and Arguments are interchangeable words that have no difference.

• Parameters are the placeholders in the function definition and arguments are the values passed to the function when it is called.

• Parameters are used with built-in functions and arguments are used with user-defined functions.

How do you remove a key-value pair from a dictionary?

• my_dict.remove(key)

• del my_dict[key]

• remove my_dict[key]

• my_dict.del(key)

What is the output of the code snippet?

• [1, 2, 3]

• [5, 2, 3]

• None

• Error for an undefined variable