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| 55 | <H2><A NAME="SECTION009550000000000000000"></A><A NAME="iterator-objects"></A> | |
| 56 | <BR> | |
| 57 | 7.5.5 Iterator Objects | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | Python provides two general-purpose iterator objects. The first, a | |
| 62 | sequence iterator, works with an arbitrary sequence supporting the | |
| 63 | <tt class="method">__getitem__()</tt> method. The second works with a callable | |
| 64 | object and a sentinel value, calling the callable for each item in the | |
| 65 | sequence, and ending the iteration when the sentinel value is | |
| 66 | returned. | |
| 67 | ||
| 68 | <P> | |
| 69 | <dl><dt>PyTypeObject <b><tt id='l2h-697' xml:id='l2h-697' class="cdata">PySeqIter_Type</tt></b></dt> | |
| 70 | <dd> | |
| 71 | Type object for iterator objects returned by | |
| 72 | <tt class="cfunction">PySeqIter_New()</tt> and the one-argument form of the | |
| 73 | <tt class="function">iter()</tt> built-in function for built-in sequence types. | |
| 74 | ||
| 75 | <span class="versionnote">New in version 2.2.</span> | |
| 76 | ||
| 77 | </dd></dl> | |
| 78 | ||
| 79 | <P> | |
| 80 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-698' xml:id='l2h-698' class="cfunction">PySeqIter_Check</tt></b>(</nobr></td><td>op)</td></tr></table></dt> | |
| 81 | <dd> | |
| 82 | Return true if the type of <var>op</var> is <tt class="cdata">PySeqIter_Type</tt>. | |
| 83 | ||
| 84 | <span class="versionnote">New in version 2.2.</span> | |
| 85 | ||
| 86 | </dd></dl> | |
| 87 | ||
| 88 | <P> | |
| 89 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-699' xml:id='l2h-699' class="cfunction">PySeqIter_New</tt></b>(</nobr></td><td>PyObject *<var>seq</var>)</td></tr></table></dt> | |
| 90 | <dd> | |
| 91 | <div class="refcount-info"> | |
| 92 | <span class="label">Return value:</span> | |
| 93 | <span class="value">New reference.</span> | |
| 94 | </div> | |
| 95 | Return an iterator that works with a general sequence object, | |
| 96 | <var>seq</var>. The iteration ends when the sequence raises | |
| 97 | <tt class="exception">IndexError</tt> for the subscripting operation. | |
| 98 | ||
| 99 | <span class="versionnote">New in version 2.2.</span> | |
| 100 | ||
| 101 | </dd></dl> | |
| 102 | ||
| 103 | <P> | |
| 104 | <dl><dt>PyTypeObject <b><tt id='l2h-700' xml:id='l2h-700' class="cdata">PyCallIter_Type</tt></b></dt> | |
| 105 | <dd> | |
| 106 | Type object for iterator objects returned by | |
| 107 | <tt class="cfunction">PyCallIter_New()</tt> and the two-argument form of the | |
| 108 | <tt class="function">iter()</tt> built-in function. | |
| 109 | ||
| 110 | <span class="versionnote">New in version 2.2.</span> | |
| 111 | ||
| 112 | </dd></dl> | |
| 113 | ||
| 114 | <P> | |
| 115 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int <b><tt id='l2h-701' xml:id='l2h-701' class="cfunction">PyCallIter_Check</tt></b>(</nobr></td><td>op)</td></tr></table></dt> | |
| 116 | <dd> | |
| 117 | Return true if the type of <var>op</var> is <tt class="cdata">PyCallIter_Type</tt>. | |
| 118 | ||
| 119 | <span class="versionnote">New in version 2.2.</span> | |
| 120 | ||
| 121 | </dd></dl> | |
| 122 | ||
| 123 | <P> | |
| 124 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject* <b><tt id='l2h-702' xml:id='l2h-702' class="cfunction">PyCallIter_New</tt></b>(</nobr></td><td>PyObject *<var>callable</var>, | |
| 125 | PyObject *<var>sentinel</var>)</td></tr></table></dt> | |
| 126 | <dd> | |
| 127 | <div class="refcount-info"> | |
| 128 | <span class="label">Return value:</span> | |
| 129 | <span class="value">New reference.</span> | |
| 130 | </div> | |
| 131 | Return a new iterator. The first parameter, <var>callable</var>, can be | |
| 132 | any Python callable object that can be called with no parameters; | |
| 133 | each call to it should return the next item in the iteration. When | |
| 134 | <var>callable</var> returns a value equal to <var>sentinel</var>, the | |
| 135 | iteration will be terminated. | |
| 136 | ||
| 137 | <span class="versionnote">New in version 2.2.</span> | |
| 138 | ||
| 139 | </dd></dl> | |
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| 177 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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