Question

question: 4
which of the following programs will not cause an error?
say_hi(\margaret\)
def say_hi(name):
print(\hi \ + name)

function say_hi(name):
print(\hi \ + name)

def say_hi(first_name=\john\, last_name=\doe\):
print(\hi \ + first_name + \ \ + last_name)
say_hi(\polly pocket\)

def say_hi(first_name=\john\, last_name):
print(\hi \ + first_name + \ \ + last_name)
say_hi(polly, pocket)

Explanation:

Step1: Analyze the first option

In Python, you cannot call a function before it is defined. Here, say_hi("Margaret") is called before the def say_hi(name) function definition. This will cause a NameError.

Step2: Analyze the second option

In Python, the correct syntax to define a function is def function_name(parameters):, not function function_name(parameters):. This is a syntax error.

Step3: Analyze the third option

When calling say_hi("Polly Pocket"), the function def say_hi(first_name = "John", last_name = "Doe") expects two separate arguments (for first_name and last_name). Passing a single string "Polly Pocket" cannot be unpacked into two variables as expected by the function parameters. This will cause an error (either a TypeError due to incorrect number of arguments or an issue with string concatenation as the function tries to use the single string in a context expecting two).

Step4: Analyze the fourth option

In Python, when defining a function with default parameters, all non - default parameters must come before default parameters. Here, def say_hi(first_name = "John", last_name) has a non - default parameter (last_name) after a default parameter (first_name). This is a syntax error.

Since the problem is about Python programming (a part of Computer Science which is a sub - field of Natural Science), and we are checking for errors in code (a type of logical deduction in programming), we use the Step - by - Step format.

Answer:

None of the given programs are error - free. But if we assume there is a formatting error in the problem presentation and re - evaluate:

If we consider the first option with the function definition and call in the correct order (swap the function call and definition), the code def say_hi(name): print("hi " + name) followed by say_hi("Margaret") is correct. But as per the given order in the first option (call before definition), it is wrong.

If we assume that in the third option, the intention was to pass two arguments (e.g., say_hi("Polly", "Pocket")), then the function def say_hi(first_name = "John", last_name = "Doe"): print("hi " + first_name + " " + last_name) is correct. But as given (passing a single string), it is wrong.

If we correct the syntax in the second option (change function to def), it is correct. But as given (with function keyword), it is wrong.

If we correct the parameter order in the fourth option (put non - default parameter first: def say_hi(last_name, first_name = "John")), then say_hi('Pocket', 'Polly') is correct. But as given (non - default after default), it is wrong.

If we assume that there is a mis - presentation and the first option has the function definition before the call (a common code organization error in the problem's display), then the first option (after re - ordering) is correct.