Python 101

1. An identifier cannot begin with a number. Which of the following is NOT a valid identifier?

• num
• _num
• NUM
• 1num_

2. An identifier can begin with an underscore (“_”).

• True
• False

3. An identifier can begin with a number.

• True
• False

4. In Python, an identifier may begin with an underscore or a letter. Which of the following is a valid identifier? Select all that apply.

• _total
• 2_count
• NUM_COUNT
• dollar_sign

5. Which of the following is a valid function call?

• forwad)
• tu-left()
• forward()
• forward(;

6. Select the following function calls that are invalid.

• ford)(
• $forDS()
• forward()
• turn_left()

7. How would you call a function named “my_function”?

• Call my_function()
• my_function
• my_function))
• my_function()

8. Identifiers in Python are case-sensitive.

• True
• False

9. 78090 is a valid identifier in Python.

• True
• False

10. Select the following invalid identifiers. (Identifiers are only allowed to start with an underscore or letter.)

• &ident
• 1ident
• _ident
• -ident

11. How would you move an object forward 3 times?

• 

  forward()
  forward()
  forward()
  

• forward() * 3
• Call_forward() 3 times
• forward() {3}

12. You are not able to call the same function twice in a row.

• True
• False

13. You can replace the parentheses on a function call with square brackets.

• True
• False

14. The parentheses at the end of a function call are optional.

• True
• False

15. Which of the following is the correct way to start a multi-line comment?

• '''
• /*
• #
• //

16. Both of the following are valid ways to comment code:

# hello 
# world

'''hello
world'''

• True
• False

17. Which of the following comments are correct? Select all that apply.

• // hello

• 

  # hello 

• /*he
      llo */

• //he
  llo// 

18. Commented lines affect the execution of your program.

• True
• False

19. What is the error in this code?

''' 
    This function does something
'''
def foo() :
    print("hello world") ''' print a message

• The single line comment must use # instead of '''
• The end of the multi-line comment cannot be on its own line
• The beginning and end of the multi line comments are incorrect
• All answers are errors in the code