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<H1><A NAME="SECTION0081500000000000000000">
6.15 <tt class="module">curses.ascii</tt> --
         Utilities for ASCII characters</A>
</H1>

<P>


<P>
New in version 1.6.

<P>
The <tt class="module">curses.ascii</tt> module supplies name constants for
ASCII characters and functions to test membership in various
ASCII character classes.  The constants supplied are names for
control characters as follows:

<P>
<table border align="center" style="border-collapse: collapse">
  <thead>
    <tr class="tableheader">
      <th align="left"><b>Name</b>&nbsp;</th>
      <th align="left"><b>Meaning</b>&nbsp;</th>
    </thead>
  <tbody valign='baseline'>
    <tr><td align="left" valign="baseline"><tt class="constant">NUL</tt></td>
        <td align="left">&nbsp;</td>
    <tr><td align="left" valign="baseline"><tt class="constant">SOH</tt></td>
        <td align="left">Start of heading, console interrupt</td>
    <tr><td align="left" valign="baseline"><tt class="constant">STX</tt></td>
        <td align="left">Start of text</td>
    <tr><td align="left" valign="baseline"><tt class="constant">ETX</tt></td>
        <td align="left">End of text</td>
    <tr><td align="left" valign="baseline"><tt class="constant">EOT</tt></td>
        <td align="left">End of transmission</td>
    <tr><td align="left" valign="baseline"><tt class="constant">ENQ</tt></td>
        <td align="left">Enquiry, goes with <tt class="constant">ACK</tt> flow control</td>
    <tr><td align="left" valign="baseline"><tt class="constant">ACK</tt></td>
        <td align="left">Acknowledgement</td>
    <tr><td align="left" valign="baseline"><tt class="constant">BEL</tt></td>
        <td align="left">Bell</td>
    <tr><td align="left" valign="baseline"><tt class="constant">BS</tt></td>
        <td align="left">Backspace</td>
    <tr><td align="left" valign="baseline"><tt class="constant">TAB</tt></td>
        <td align="left">Tab</td>
    <tr><td align="left" valign="baseline"><tt class="constant">HT</tt></td>
        <td align="left">Alias for <tt class="constant">TAB</tt>: ``Horizontal tab''</td>
    <tr><td align="left" valign="baseline"><tt class="constant">LF</tt></td>
        <td align="left">Line feed</td>
    <tr><td align="left" valign="baseline"><tt class="constant">NL</tt></td>
        <td align="left">Alias for <tt class="constant">LF</tt>: ``New line''</td>
    <tr><td align="left" valign="baseline"><tt class="constant">VT</tt></td>
        <td align="left">Vertical tab</td>
    <tr><td align="left" valign="baseline"><tt class="constant">FF</tt></td>
        <td align="left">Form feed</td>
    <tr><td align="left" valign="baseline"><tt class="constant">CR</tt></td>
        <td align="left">Carriage return</td>
    <tr><td align="left" valign="baseline"><tt class="constant">SO</tt></td>
        <td align="left">Shift-out, begin alternate character set</td>
    <tr><td align="left" valign="baseline"><tt class="constant">SI</tt></td>
        <td align="left">Shift-in, resume default character set</td>
    <tr><td align="left" valign="baseline"><tt class="constant">DLE</tt></td>
        <td align="left">Data-link escape</td>
    <tr><td align="left" valign="baseline"><tt class="constant">DC1</tt></td>
        <td align="left">XON, for flow control</td>
    <tr><td align="left" valign="baseline"><tt class="constant">DC2</tt></td>
        <td align="left">Device control 2, block-mode flow control</td>
    <tr><td align="left" valign="baseline"><tt class="constant">DC3</tt></td>
        <td align="left">XOFF, for flow control</td>
    <tr><td align="left" valign="baseline"><tt class="constant">DC4</tt></td>
        <td align="left">Device control 4</td>
    <tr><td align="left" valign="baseline"><tt class="constant">NAK</tt></td>
        <td align="left">Negative acknowledgement</td>
    <tr><td align="left" valign="baseline"><tt class="constant">SYN</tt></td>
        <td align="left">Synchronous idle</td>
    <tr><td align="left" valign="baseline"><tt class="constant">ETB</tt></td>
        <td align="left">End transmission block</td>
    <tr><td align="left" valign="baseline"><tt class="constant">CAN</tt></td>
        <td align="left">Cancel</td>
    <tr><td align="left" valign="baseline"><tt class="constant">EM</tt></td>
        <td align="left">End of medium</td>
    <tr><td align="left" valign="baseline"><tt class="constant">SUB</tt></td>
        <td align="left">Substitute</td>
    <tr><td align="left" valign="baseline"><tt class="constant">ESC</tt></td>
        <td align="left">Escape</td>
    <tr><td align="left" valign="baseline"><tt class="constant">FS</tt></td>
        <td align="left">File separator</td>
    <tr><td align="left" valign="baseline"><tt class="constant">GS</tt></td>
        <td align="left">Group separator</td>
    <tr><td align="left" valign="baseline"><tt class="constant">RS</tt></td>
        <td align="left">Record separator, block-mode terminator</td>
    <tr><td align="left" valign="baseline"><tt class="constant">US</tt></td>
        <td align="left">Unit separator</td>
    <tr><td align="left" valign="baseline"><tt class="constant">SP</tt></td>
        <td align="left">Space</td>
    <tr><td align="left" valign="baseline"><tt class="constant">DEL</tt></td>
        <td align="left">Delete</td></tbody>
</table>

<P>
Note that many of these have little practical use in modern usage.

<P>
The module supplies the following functions, patterned on those in the
standard C library:

<P>
<dl><dt><b><a name='l2h-1315'><tt class='function'>isalnum</tt></a></b> (<var>c</var>)
<dd>
Checks for an ASCII alphanumeric character; it is equivalent to
"<tt class="samp">isalpha(<var>c</var>) or isdigit(<var>c</var>)</tt>".
</dl>

<P>
<dl><dt><b><a name='l2h-1316'><tt class='function'>isalpha</tt></a></b> (<var>c</var>)
<dd>
Checks for an ASCII alphabetic character; it is equivalent to
"<tt class="samp">isupper(<var>c</var>) or islower(<var>c</var>)</tt>".
</dl>

<P>
<dl><dt><b><a name='l2h-1317'><tt class='function'>isascii</tt></a></b> (<var>c</var>)
<dd>
Checks for a character value that fits in the 7-bit ASCII set.
</dl>
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