In any case, if your Python script file and your data input file are not in the same directory, you always have to specify either a relative path between them or you have to use an absolute path for one of them. That way, you can simply cd to the directory containing your Python script file and run it. You should make use of this, because it simplifies daily work greatly. Riser failure has both economic and environmental consequences hence the design life is usually greater than the field life, which is significantly reduced by vortex induced vibration (VIV).

These impose direct forces, hence cyclic stresses, and fatigue damage on the SCR.

In order to make this work, the directory containing the python executable must be in the PATH, a so-called environment variable that contains directories that are automatically used for searching executables when you enter a command. Steel catenary risers, (SCR) usually installed between seabed wellhead and floating platform are subjected to vortex shedding. start the terminal, cd to the directory where your input file is located and start the Python script there using the command $ python script.py There, I recommend to work in the terminal (on the command line), i.e. You are obviously performing programming tasks in Python under Mac OS. In your case, the file test.rtf must be in the same directory in which you execute the program. The current working directory usually is the directory in which you started the program. If the user does not pass the full path to the file (on Unix type systems this means a path that starts with a slash), the path is interpreted relatively to the current working directory.

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