# Harvard:Biophysics 101/2007/02/08

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## Q&A

- Q1: "I keep getting indentation errors when running my python scripts - what's the deal?"
- A1: See 1, 2 for info.

## New tasks

- Start thinking about what kind of project you want to work on.
- Read the Python Style Guide by GvR

## Solution to Feb 6 Assignment

#!/usr/bin/env python from random import choice # create a list to store our results tally = [0 for i in range(11)] for i in range(10000): # generate a random 10-mer coinflip = ''.join([choice('HT') for j in range(10)]) # tally k-mers in the 10-mer for k in range(2,11): Hcount = Tcount = 0 H = ''.join(['H' for n in range(k)]) # k-mer of H's pos = coinflip.find(H,0) while not pos == -1: Hcount = Hcount + 1 pos = coinflip.find(H,pos+1) T = ''.join(['T' for n in range(k)]) # k-mer of T's pos = coinflip.find(T,0) while not pos == -1: Tcount = Tcount + 1 pos = coinflip.find(T,pos+1) tally[k] = tally[k] + Hcount + Tcount for i in range(2,11): print '%2s: %5d' % (i, tally[i])

- Example output

2: 45129 3: 20055 4: 8776 5: 3784 6: 1588 7: 638 8: 247 9: 81 10: 22