Syntax Error invalid syntax for no apparent reason

Question

I ve been trying to get a fix and can t find why the error keeps appearing  Pmin Pmax w fi1 and fi2 have all been assigned finite values     guess Pmin  Pmax-Pmin    1-w  2  fi1  w  2  fi2    When i remove this line from the code  the same error appears at the next line of code  again for no reason I can think of  Edit  Here is the chunk of code I was referring to   def Psat self  T       pop  self getPborder T      boolean int pop 0        P1 pop 1      P2 pop 2      if boolean          Pmin   float min  P1  P2            Pmax   float max  P1  P2            Tr T self typeMolecule Tc         w 0 5  1 scipy tanh  10  5   Tr-0 6            fi1 0 5  1-scipy tanh 8   Tr  0 4 -1            fi2 0 460 scipy sqrt 1- Tr-0 566   2  0 434  2  0 494          guess   Pmin  Pmax-Pmin    1-w  2  fi1  w  2  fi2     error here          solution   scipy optimize newton funcPsat guess  args  T self

User · Accepted Answer

For problems where it seems to be an error on a line you think is correct, you can often remove/comment the line where the error appears to be and, if the error moves to the next line, there are two possibilities.

Either both lines have a problem or the previous line has a problem which is being carried forward. The most likely case is the second option (even more so if you remove another line and it moves again).

For example, the following Python program twisty_passages.py:

xyzzy = (1 +
plugh = 7

generates the error:

  File "twisty_passages.py", line 2
    plugh = 7
          ^
SyntaxError: invalid syntax

despite the problem clearly being on line 1.

In your particular case, that is the problem. The parentheses in the line before your error line is unmatched, as per the following snippet:

# open parentheses: 1  2             3
#                   v  v             v
fi2=0.460*scipy.sqrt(1-(Tr-0.566)**2/(0.434**2)+0.494
#                               ^             ^
# close parentheses:            1             2

Depending on what you're trying to achieve, the solution may be as simple as just adding another closing parenthesis at the end, to close off the sqrt function.

I can't say for certain since I don't recognise the expression off the top of my head. Hardly surprising if (assuming PSAT is the enzyme, and the use of the typeMolecule identifier) it's to do with molecular biology - I seem to recall failing Biology consistently in my youth :-)

User · Answer

I encountered a similar problem  with a syntax error that I knew should not be a syntax error   In my case it turned out that a Python 2 interpreter was trying to run Python 3 code  or vice versa  I think that my shell had a PYTHONPATH with a mixture of Python 2 and Python 3

User · Answer

You re missing a close paren in this line   fi2 0 460 scipy sqrt 1- Tr-0 566   2  0 434  2  0 494   There are three   and only two     I hope This will help you

User · Answer

I noticed that invalid syntax error for no apparent reason can be caused by using space in  print f  something something     Python IDLE seems to jump and highlight a part of the first line for some reason  even if the first line happens to be a comment   which is misleading

User · Answer

If you are running the program with python  try running it with python3

[python] 'Syntax Error: invalid syntax' for no apparent reason

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