Translating code into mathematical formula: conditionals

How would I translate this code into a mathematical formula?

myset={4,2,5,26,8,1,2}, d0=[], d1=[], dnp1=[]
for i in range(myset):
if   i==0: d0=myset[i]
elif i==1: d1=myset[i]
else:      dnp1+=myset[i]


(a $\LaTeX$ example would be great)

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I have received this solution over IRC, it is useful but being able to more explicitly do an if elif type thing would be better: $$d1 = myset_1, d0 = myset_0, dnp1 = \sum_{i >= 2} myset_i$$ –  A T Jul 6 '12 at 16:50
If $i \in \{4, 2, 5, 26, 8, 1, 2\}$ then how come you test for $i = 0$?! $i$ will never be zero. –  user2468 Jul 6 '12 at 17:35

$$\sum_{i}^{\text{myset}} d_0=\{ \unicode{x27E6}i==0\unicode{x27E7}\ i \},\ d_1=\{ \unicode{x27E6}i==1\unicode{x27E7}\ i \},\ d_{np1}=\{ \unicode{x27E6}i>1\unicode{x27E7}\ i \}$$