Are you familiar with the information on this Python docs page?
The first line is Leading whitespace (spaces and tabs) at the beginning of a logical line is used to compute the indentation level of the line, which in turn is used to determine the grouping of statements.
The error message you see indicates that the parser cannot place the line within a ‘grouping of statements.’ Unless it is inside a defined function or control block (loop, if statement etc) it probably should be left justified.