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PONeed to remove duplicates for a list with in a function
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  1. PONeed to remove duplicates for a list with in a function
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    copied!<p>this is what i have so far:</p> <pre><code>def unique_element(group): list=[] for element in group: piece=parse_formula(element) for x in piece: list.append(x[0]) return list #list(set(list)) </code></pre> <p>I have the other function below but this is the one I am trying to fix. Right now it returns a function with a list of letters but I do not want repeating letters. Example:</p> <pre><code>unique_element(['H2O2Y2','R3O2','Y2S3']) ['H', 'O', 'Y', 'R', 'O', 'Y', 'S'] </code></pre> <p>I thought using <code>list(set(list))</code> would work but when i run the function i get:</p> <pre><code>unique_element(['H2O2Y2','R3O2','Y2S3']) </code></pre> <p>Traceback (most recent call last):</p> <pre><code>File "&lt;stdin&gt;", line 1, in &lt;module&gt; File "_sage_input_61.py", line 10, in &lt;module&gt; exec compile(u'print _support_.syseval(python, u"unique_element([\'H2O2Y2\',\'R3O2\',\'Y2S3\'])", __SAGE_TMP_DIR__) File "", line 1, in &lt;module&gt; File "/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/devel/sagenb-git/sagenb/misc/support.py", line 479, in syseval return system.eval(cmd, sage_globals, locals = sage_globals) File "/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/misc/python.py", line 56, in eval eval(z, globals) File "", line 1, in &lt;module&gt; File "", line 10, in unique_element TypeError: 'list' object is not callable </code></pre> <p>other functions:</p> <pre><code> from numpy import * from scipy import * from pylab import * import re def parse_formula(formula): '''Given a simple chemical formula, return a list of (element, multiplicity) tuples. Example: 'H2SO4' --&gt; [('H', 2.0), ('S', 1.0), ('O', 4.0)] ''' return [ (elem, float(mul) if mul else 1.) for (elem, mul) in re.findall(r'([A-Z][a-z]*)(\d*)', formula) ] </code></pre>
 

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