PEP8: continuation line over-indented for visual indent

A continuation line is indented farther than it should be for a visual indent.

Anti-pattern In this example, the string "World" is indented two spaces farther than it should be.

print("Python", ("Hello",
                   "World"))

Best practice

print("Python", ("Hello",
                 "World"))

reference: https://www.flake8rules.com/rules/E127.html

The line-extending backslash has the issue of having trailing whitespace that can break your code. This is a popular fix and is PEP8-compliant:

if (first_index < 0 or
    second_index > self._number_of_plates - 1):

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