1.02_ManipulatingDNAStrings.ipynb

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     "data": {
      "text/plain": [
       "'ACCA'"
      ]
     },
     "execution_count": 1,
     "metadata": {},
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   "source": [
    "def longestCommonPrefix(s1, s2):\n",
    "    i = 0\n",
    "    while i < len(s1) and i < len(s2) and s1[i] == s2[i]:\n",
    "        i += 1\n",
    "    return s1[:i]\n",
    "longestCommonPrefix('ACCATTG', 'ACCAAGTC')"
   ]
  },
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   "cell_type": "code",
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   "metadata": {
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    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
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   "source": [
    "def match(s1, s2):\n",
    "    if not len(s1) == len(s2):\n",
    "        return False\n",
    "    for i in range(0, len(s1)):\n",
    "        if not s1[i] == s2[i]:\n",
    "            return False\n",
    "    return True\n",
    "match('ACCATTG', 'ACCATTG')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
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     "execution_count": 3,
     "metadata": {},
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   "source": [
    "'ACCATTG' == 'ACCATTG'"
   ]
  },
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   "execution_count": 4,
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   "outputs": [],
   "source": [
    "complement = {'A': 'T', 'C': 'G', 'G': 'C', 'T': 'A'}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
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    {
     "data": {
      "text/plain": [
       "'T'"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "complement['A']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "'G'"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "complement['C']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'CAATGGT'"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def reverseComplement(s):\n",
    "    complement = {'A': 'T', 'C': 'G', 'G': 'C', 'T': 'A'}\n",
    "    t = ''\n",
    "    for base in s:\n",
    "        t = complement[base] + t\n",
    "    return t\n",
    "reverseComplement('ACCATTG')"
   ]
  }
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