Which of the following lines properly starts a function using two parameters, both with zeroed default values?

Question

Options

• Adef fun(a=0, b=0):
• Bdef fun(a=0, b):
• Cdef fun(a, b=0):
• Ddef fun(a, b=0):

• A
  78% (31)
• B
  13% (5)
• C
  8% (3)
• D
  3% (1)

Explanation

Option A is the only choice that assigns a default value of 0 to both parameters, satisfying the requirement that each parameter is "zeroed" by default. Option B is actually a SyntaxError in Python - a parameter without a default (b) cannot follow one that has a default (a=0), because Python wouldn't know which argument maps where. Options C and D are identical and only give a default to the second parameter (b=0), leaving a without any default - so a caller would be forced to supply a explicitly, meaning both parameters are not zeroed.

Memory tip: Think of it as a sliding rule - once you start assigning defaults, every parameter to the right must also have a default. If you want all defaults, every parameter needs one, top to bottom.

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