Why Does a 'SyntaxError: invalid syntax' Appear on the Wrong Line of My Python Code?

Invalid Syntax Error in Seemingly Valid Code

While debugging code, you may encounter the "SyntaxError: invalid syntax" error despite the line of code appearing valid. If removing the line triggers the same error on the next line, it suggests an underlying issue.

In the provided code:

guess = Pmin+(Pmax-Pmin)*((1-w**2)*fi1+(w**2)*fi2)

Although the error message indicates an issue on this line, the actual error lies in the previous line:

fi2=0.460*scipy.sqrt(1-(Tr-0.566)**2/(0.434**2)+0.494

This line has unbalanced parentheses: three open parentheses and only two closing parentheses. The error message misleads because Python tries to continue parsing the code and reports the syntax error on the subsequent line.

To resolve this issue, correct the parentheses, such as:

fi2=0.460*scipy.sqrt(1-(Tr-0.566)**2/(0.434**2)) + 0.494

In earlier Python versions, such errors could easily be overlooked. However, the PEG parser introduced in Python 3.9 provides improved error messages that accurately pinpoint the location of the error:

  File "prog.py", line 1
    xyzzy = (1 +
            ^
SyntaxError: '(' was never closed

Therefore, when encountering "SyntaxError: invalid syntax" errors, it's crucial to examine the surrounding lines for potential syntax errors, as the reported error line may not be the actual problem.

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