Question

What does the '+=' operator do in Python, and how is it incorporated into the following code?

def ExtractOdds(zeta):
result = ""
for x in range(0, len(zeta), 1):
if x % 2 == 1:
result += zeta[x]
return result
a) It subtracts the right-hand operand from the left-hand operand.
b) It multiplies the left-hand operand by the right-hand operand.
c) It appends the character at the odd indices of 'zeta' to the 'result' variable.
d) It divides the left-hand operand by the right-hand operand.

Answer 1

The '+=' operator in Python is used for concatenation. In the given code, it appends characters at odd indices to a result variable.

Step-by-step explanation:

The '+=' operator in Python is the concatenation assignment operator. It is used to add the right-hand operand to the left-hand operand and assign the result to the left-hand operand.

In the given code, the '+=' operator is used to append the character at the odd indices of the 'zeta' string to the 'result' variable. The for loop iterates through the indices of 'zeta' using the range() function, and the if statement checks if the index is odd (x % 2 == 1). If it is, the character at that index is added to the 'result' using the '+=' operator.

Therefore, option c) is the correct answer. The '+=' operator appends the character at the odd indices of 'zeta' to the 'result' variable.