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    <p>For illustration, let's take a small excerpt of that bash script:</p> <pre><code>python -c 'print file.shape\n import sys,os\n' </code></pre> <p>In a bash single-quoted string, as you have here, the characters "\n" represent a backslash followed by "n". Python sees this as an "extra backslash" even though you meant "\n" to be interpreted as a newline character. This is what generates errors of the type</p> <pre><code>unexpected character after line continuation character </code></pre> <p>To fix this, try instead:</p> <pre><code>python -c $'print file.shape\n import sys,os\n' </code></pre> <p>Bash treats <code>$'...'</code> strings specially and will, among other things, replace <code>\n</code> sequences with new line characters which python will understand and know how to process.</p> <p>(The above will still give an error because <code>file</code> does not have a <code>shape</code> attribute. More on this below.)</p> <p>There are other issues. Take, for example, this excerpt:</p> <pre><code>python -c 'sys.path.append(os.path.join(os.environ['PETSC_DIR'],'bin','pythonscripts'))' </code></pre> <p>After bash does quote removal, python sees: </p> <pre><code>sys.path.append(os.path.join(os.environ[PETSC_DIR],bin,pythonscripts)) </code></pre> <p>This won't work because python needs <code>PETSC_DIR</code> and <code>bin</code> and <code>pythonscripts</code> to be quoted (with either single or double-quotes: python doesn't care). Try instead:</p> <p>python -c 'sys.path.append(os.path.join(os.environ["PETSC_DIR"],"bin","pythonscripts"))'</p> <p>When bash sees double-quotes inside single quotes, it leaves them alone. Thus, python will receive quoted strings where it needs them.</p> <p>In sum, it looks to me like the error is caused not by your python code but by what bash does to your python code before passing it to python.</p> <p>ADDENDUM: As for the <code>print walls.shape()</code> error where <code>walls</code> is a file handle, the error means what it says: file handles do not have <code>shape</code> attributes. Possibly you want to use the <a href="http://docs.python.org/2/library/os.path.html#os.path.getsize" rel="nofollow"><code>os.path.getsize(path)</code></a> function from the <code>os.path</code> module to get file size in bytes?</p>
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    1. COthanks @John1024 ! that helped!! yes the trouble was running python in bash!
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