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<p class="MsoNormal">Hi there,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a problem making the SeqFeature() class comparable by providing a __lt__ function. Consider the following:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">------------------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal">#!/usr/bin/env python3<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">from Bio import SeqFeature<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">def cmp1(this,other):<o:p></o:p></p>
<p class="MsoNormal"> return int(this.location.start) < int(other.location.start);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">SeqFeature.__lt__=cmp1;<o:p></o:p></p>
<p class="MsoNormal">f1 = SeqFeature.SeqFeature(SeqFeature.FeatureLocation(10, 200));<o:p></o:p></p>
<p class="MsoNormal">f2 = SeqFeature.SeqFeature(SeqFeature.FeatureLocation(1000, 1200));<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">if f1<f2:<o:p></o:p></p>
<p class="MsoNormal"> print("f1<f2");<o:p></o:p></p>
<p class="MsoNormal">else:<o:p></o:p></p>
<p class="MsoNormal"> print("nope, f1>=f2");<o:p></o:p></p>
<p class="MsoNormal">------------------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The code above runs with an error message: <o:p></o:p></p>
<p class="MsoNormal"> if f1<f2:<o:p></o:p></p>
<p class="MsoNormal">TypeError: unorderable types: SeqFeature() < SeqFeature()<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What I do not understand is that this should be the canonical recipe for making any class comparable via LT operator. Compare to the following code which runs without problems:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">------------------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal">#!/usr/bin/env python3<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">class myclass():<o:p></o:p></p>
<p class="MsoNormal"> def __init__(self, value):<o:p></o:p></p>
<p class="MsoNormal"> self.bla=value;<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">def cmp2(this,other):<o:p></o:p></p>
<p class="MsoNormal"> return this.bla < other.bla;<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">myclass.__lt__=cmp2;<o:p></o:p></p>
<p class="MsoNormal">m1=myclass(1);<o:p></o:p></p>
<p class="MsoNormal">m2=myclass(2);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">if m1<m2:<o:p></o:p></p>
<p class="MsoNormal"> print("m1<m2");<o:p></o:p></p>
<p class="MsoNormal">else:<o:p></o:p></p>
<p class="MsoNormal"> print("nope, m1>=m2");<o:p></o:p></p>
<p class="MsoNormal">------------------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What am I missing?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best,<o:p></o:p></p>
<p class="MsoNormal"> Bastien<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:8.5pt;color:#008FD5">-- <br>
DSM Nutritional Products Microbia Inc | Bioinformatics<br>
60 Westview Street | Lexington, MA 02421 | United States<br>
Phone +1 781 259 7613 | Fax +1 781 259 0615</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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