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    "### <center>San Jose State University<br>Department of Applied Data Science<br><br>**DATA 200<br>Computational Programming for Data Analytics**<br><br>Spring 2023<br>Instructor: Ron Mak</center>"
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   "source": [
    "# 8.10 Characters and Character-Testing Methods"
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    "#### The string character-testing methods test all the characters of a string.\n",
    "| Method | Returns `True` if ... |\n",
    "| --- | --- |\n",
    "| `isalnum()` | The string contains only **alphanmeric** (letters and digit) characters. |\n",
    "| `isalpha()` | The string contains only **alphabetic** (letters) characters. |\n",
    "| `isdecimal()` | The string contains only **decimal integer** characters. |\n",
    "| `isdigit()` | The string contains only digits (`'0'`, `'1'`, `'2'`, ... `'9'`). |\n",
    "| `isidentifier()` | The string represents a valid Python **identifier**. |\n",
    "| `isnumeric()` | The string represents **numeric value** without a `+` or `-` sign or a decimal point. |\n",
    "| `isspace()` | The string contains only **whitespace** characters. |\n",
    "| `istitle()` | Only the first character of each word in the string is **upper case**. |\n",
    "| `isupper()` | The string contains only **upper-case** characters. |\n",
    "| `islower()` | The string contains only **lower-case** characters. |\n",
    "| `isascii()` | The string contains only **ASCII** characters (those with `ord()` less than 128). |"
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   "source": [
    "'-27'.isdigit()"
   ]
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   "source": [
    "'27'.isdigit()"
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  {
   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
   "source": [
    "'A9876'.isalnum()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "'123 Main Street'.isalnum()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "'∑x'.isascii()"
   ]
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   "source": [
    "##########################################################################\n",
    "# (C) Copyright 2019 by Deitel & Associates, Inc. and                    #\n",
    "# Pearson Education, Inc. All Rights Reserved.                           #\n",
    "#                                                                        #\n",
    "# DISCLAIMER: The authors and publisher of this book have used their     #\n",
    "# best efforts in preparing the book. These efforts include the          #\n",
    "# development, research, and testing of the theories and programs        #\n",
    "# to determine their effectiveness. The authors and publisher make       #\n",
    "# no warranty of any kind, expressed or implied, with regard to these    #\n",
    "# programs or to the documentation contained in these books. The authors #\n",
    "# and publisher shall not be liable in any event for incidental or       #\n",
    "# consequential damages in connection with, or arising out of, the       #\n",
    "# furnishing, performance, or use of these programs.                     #\n",
    "##########################################################################\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Additional material (C) Copyright 2023 by Ronald Mak"
   ]
  }
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