strings.ipynb

{
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  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h1 align=\"center\">Strings</h1>"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
   "source": [
    "ord('T'), chr(84)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   },
   "outputs": [],
   "source": [
    "'' in 'A string', 'str' in 'A string', 'St' not in 'A string'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "print(len('Is this REALLY worth $38.20?'))\n",
    "print('Is this REALLY worth $38.20?'[8])\n",
    "print('Is this REALLY worth $38.20?'[8: 15])\n",
    "print('Is this REALLY worth $38.20?'[8: 15: 2])\n",
    "print('Is this' + ' REALLY worth ' + '$38.20?')\n",
    "print('Is this' ' REALLY worth '\n",
    "      '$38.20?')\n",
    "print('$38.20' * 3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "S = 'Is this REALLY worth $38.20?'\n",
    "print(S.casefold())\n",
    "print(S.lower())\n",
    "print(S.capitalize())\n",
    "print(S.title())\n",
    "print(S.upper())\n",
    "print(S.swapcase())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   },
   "outputs": [],
   "source": [
    "S = 'Is this REALLY worth $38.20?'\n",
    "# Next six strings have a width of 50\n",
    "print(S.center(50))\n",
    "print(S.center(50, '_'))\n",
    "print(S.ljust(50))\n",
    "print(S.ljust(50, '_'))\n",
    "print(S.rjust(50))\n",
    "print(S.rjust(50, '_'))\n",
    "print()\n",
    "\n",
    "print('-123.45'.zfill(4))\n",
    "print('-123.45'.zfill(12))\n",
    "print()\n",
    "\n",
    "print('Use \\t to insert a tab.')\n",
    "# The default, which can be changed, is to replace a tab by 8 spaces\n",
    "print('Use \\t to insert a tab.'.expandtabs())\n",
    "print('Use \\t to insert a tab.'.expandtabs(12))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "print(' \\n\\t  A string with leading and trailing spaces  \\t\\n  '.strip())\n",
    "print(' \\n\\t  A string with leading and trailing spaces  \\t\\n  '.lstrip())\n",
    "print('***')\n",
    "print(' \\n\\t  A string with leading and trailing spaces  \\t\\n  '.rstrip())\n",
    "print('Another string without leading and trailing spaces'.strip('eAconsiw'))\n",
    "print('Another string without leading and trailing spaces'.lstrip('eAconsiw'))\n",
    "print('Another string without leading and trailing spaces'.rstrip('eAconsiw'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "print('Forêt'.isalpha())\n",
    "print('größer_123'.islower())\n",
    "print('ΕΛΛΑΣ$><$!'.isupper())\n",
    "print(' String Reference 1345 Mrfc…'.istitle())\n",
    "print('0123'.isdecimal())\n",
    "print('0123'.isdigit())\n",
    "print('\\u00B2 is also a digit')\n",
    "print('0123'.isnumeric())\n",
    "print('\\u00BD is also numeric')\n",
    "print('012AbC'.isalnum())\n",
    "print('No_digit_such_as_8_in_a_Python_identifier'.isidentifier())\n",
    "print(' \\t\\n\\f\\r'.isspace())\n",
    "print('˜µ≥!a9溧…≈≥!'.isprintable())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "print('baabababababaab'.count('aba'))\n",
    "print('baabababababaab'.count('aba', 3))\n",
    "print('baabababababaab'.count('aba', 3, 11))\n",
    "print('baabababababaab'.count('aba', 3, 10))\n",
    "print()\n",
    "\n",
    "print('baabababababaab'.find('aba'))\n",
    "print('baabababababaab'.find('aba', 3))\n",
    "print('baabababababaab'.find('aba', 3, 7))\n",
    "print('baabababababaab'.find('aba', 3, 6))\n",
    "print('baabababababaab'.index('aba'))\n",
    "print('baabababababaab'.index('aba', 3))\n",
    "print('baabababababaab'.index('aba', 3, 7))\n",
    "print()\n",
    "\n",
    "print('baabababababaab'.rfind('aba'))\n",
    "print('baabababababaab'.rfind('aba', -4))\n",
    "print('baabababababaab'.rfind('aba', 1, 8))\n",
    "print('baabababababaab'.rindex('aba'))\n",
    "print('baabababababaab'.rindex('aba', 1, 8))\n",
    "print()\n",
    "\n",
    "print('baabababababaab'.startswith('baab'))\n",
    "print('baabababababaab'.endswith('abaab'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "print('baabababababaab'.replace('aba', '_NEW_'))\n",
    "print('baabababababaab'.replace('aba', '_NEW_', 2))\n",
    "print()\n",
    "\n",
    "# 99 is the Unicode ordinal of character c\n",
    "print('abcdefgabcdefg'.translate(str.maketrans({'a': '_A_', 99: '_C_', 'd': None })))\n",
    "print('abcdefgabcdefg'.translate(str.maketrans('acd', 'ACD')))\n",
    "print('abcdefgabcdefg'.translate(str.maketrans('acd', 'ACD', 'ef')))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "print('abc;defg;,hijkl;,mnop'.partition(';,'))\n",
    "print('abc;defg;,hijkl;,mnop'.partition(',;'))\n",
    "print()\n",
    "\n",
    "print('abc;defg;,hijkl;,mnop'.rpartition(';,'))\n",
    "print('abc;defg;,hijkl;,mnop'.rpartition(',;'))\n",
    "print()\n",
    "\n",
    "print('abc;defg;,hijkl;,mnop'.split(';,'))\n",
    "print('abc;defg;,hijkl;,mnop'.split(';,', 1))\n",
    "print('  \\n\\t  abc  \\n\\t  defg  \\n\\t  hijkl  \\n\\t  mnop  \\n\\t  '.split())\n",
    "print('  \\n\\t  abc  \\n\\t  defg  \\n\\t  hijkl  \\n\\t  mnop  \\n\\t  '.split(maxsplit = 1))\n",
    "print()\n",
    "\n",
    "print('abc;defg;,hijkl;,mnop'.rsplit(';,'))\n",
    "print('abc;defg;,hijkl;,mnop'.rsplit(';,', 1))\n",
    "print('  \\n\\t  abc  \\n\\t  defg  \\n\\t  hijkl  \\n\\t  mnop  \\n\\t  '.rsplit())\n",
    "print('  \\n\\t  abc  \\n\\t  defg  \\n\\t  hijkl  \\n\\t  mnop  \\n\\t  '.rsplit(maxsplit = 1))\n",
    "print()\n",
    "print('''adc\n",
    "         defg\n",
    "         hijkl\n",
    "         mnop'''.splitlines())\n",
    "print('''adc\n",
    "         defg\n",
    "         hijkl\n",
    "         mnop'''.splitlines(True))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "print('_*_'.join(['a', 'bc', 'de', 'f']))\n",
    "print('_*_'.join(('a', 'bc', 'de', 'f')))\n",
    "print('_*_'.join({'a', 'bc', 'de', 'f'}))\n",
    "print('_*_'.join({'a' : 1, 'bc' : 2, 'de': 3, 'f': 4}))"
   ]
  }
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