Which of the following functions creates a sequence of 50 bytes?

The function that creates a sequence of 50 bytes is indeed the one that takes an integer argument, specifically bytes(50). When called this way, it generates a bytes object that consists of 50 null bytes (\x00). This effectively gives you a sequence where each byte is initialized to zero, resulting in a total of 50 bytes.

In contrast, when looking at the other choices, bytes([50, 0]) and bytes([50]) create bytes objects based on the elements of the list provided. However, the input to these functions is a list of integers that correspond to the byte values, so they do not yield a sequence of 50 bytes but rather encode the specific byte values represented by the integers in the list. On the other hand, bytes('50') attempts to convert a string into bytes directly, which leads to a TypeError since the string must first be encoded into bytes.

Thus, bytes(50) is the function that effectively creates a straightforward sequence of 50 bytes, all initialized to zero, making it the correct choice for this question.