Quiz Discussion

Why are local variable names beginning with an underscore discouraged?
Course Name: Python

  • 1] they are used to indicate a private variables of a class
  • 2] they confuse the interpreter
  • 3] they are used to indicate global variables
  • 4] they slow down execution
Solution
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# Quiz
1
Discuss
Which of the following is invalid?
  • 1] _a = 1
  • 2] __a = 1
  • 3] __str__ = 1
  • 4] none of the mentioned
Solution
2
Discuss

Which of the following is an invalid statement?

  • 1] abc = 1,000,000
  • 2] a b c = 1000 2000 3000
  • 3] a,b,c = 1000, 2000, 3000
  • 4] a_b_c = 1,000,000
Solution
3
Discuss
What is the maximum possible length of an identifier?
  • 1] 31 characters
  • 2] 63 characters
  • 3] 79 characters
  • 4] none of the mentioned
Solution
4
Discuss

What does ~4 evaluate to?

  • 1] -5
  • 2] -4
  • 3] -3
  • 4] +3
Solution
5
Discuss

What is the output of print 0.1 + 0.2 == 0.3?

  • 1] True
  • 2] False
  • 3] Machine dependent
  • 4] Error
Solution
6
Discuss
Which of the following is an invalid variable?
  • 1] my_string_1
  • 2] 1st_string
  • 3] foo
  • 4] _
Solution
7
Discuss
Which of the following is true for variable names in Python?
  • 1] unlimited length
  • 2] all private members must have leading and trailing underscores
  • 3] underscore and ampersand are the only two special characters allowed
  • 4] none of the mentioned
Solution
8
Discuss

What does ~~~~~~5 evaluate to?

  • 1] +5
  • 2] -11
  • 3] +11
  • 4] -5
Solution
9
Discuss
Which of the following cannot be a variable?
  • 1] __init__
  • 2] in
  • 3] it
  • 4] on
Solution
10
Discuss

Which of the following is incorrect?

  • 1] x = 0b101
  • 2] x = 0x4f5
  • 3] x = 19023
  • 4] x = 03964
Solution
# Quiz