projects / OpenSPARC-T2-DV / blame
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| 53 | ||
| 54 | <H1><A NAME="SECTION00142000000000000000000"> | |
| 55 | 12.20 <tt class="module">csv</tt> -- CSV File Reading and Writing</A> | |
| 56 | </H1> | |
| 57 | ||
| 58 | <P> | |
| 59 | <A NAME="module-csv"></A> | |
| 60 | ||
| 61 | <P> | |
| 62 | ||
| 63 | <span class="versionnote">New in version 2.3.</span> | |
| 64 | ||
| 65 | <a id='l2h-4212' xml:id='l2h-4212'></a> | |
| 66 | <a id='l2h-4211' xml:id='l2h-4211'></a> | |
| 67 | <P> | |
| 68 | The so-called CSV (Comma Separated Values) format is the most common import | |
| 69 | and export format for spreadsheets and databases. There is no ``CSV | |
| 70 | standard'', so the format is operationally defined by the many applications | |
| 71 | which read and write it. The lack of a standard means that subtle | |
| 72 | differences often exist in the data produced and consumed by different | |
| 73 | applications. These differences can make it annoying to process CSV files | |
| 74 | from multiple sources. Still, while the delimiters and quoting characters | |
| 75 | vary, the overall format is similar enough that it is possible to write a | |
| 76 | single module which can efficiently manipulate such data, hiding the details | |
| 77 | of reading and writing the data from the programmer. | |
| 78 | ||
| 79 | <P> | |
| 80 | The <tt class="module">csv</tt> module implements classes to read and write tabular data in | |
| 81 | CSV format. It allows programmers to say, ``write this data in the format | |
| 82 | preferred by Excel,'' or ``read data from this file which was generated by | |
| 83 | Excel,'' without knowing the precise details of the CSV format used by | |
| 84 | Excel. Programmers can also describe the CSV formats understood by other | |
| 85 | applications or define their own special-purpose CSV formats. | |
| 86 | ||
| 87 | <P> | |
| 88 | The <tt class="module">csv</tt> module's <tt class="class">reader</tt> and <tt class="class">writer</tt> objects read and | |
| 89 | write sequences. Programmers can also read and write data in dictionary | |
| 90 | form using the <tt class="class">DictReader</tt> and <tt class="class">DictWriter</tt> classes. | |
| 91 | ||
| 92 | <P> | |
| 93 | <div class="note"><b class="label">Note:</b> | |
| 94 | This version of the <tt class="module">csv</tt> module doesn't support Unicode | |
| 95 | input. Also, there are currently some issues regarding ASCII NUL | |
| 96 | characters. Accordingly, all input should generally be printable | |
| 97 | ASCII to be safe. These restrictions will be removed in the future. | |
| 98 | </div> | |
| 99 | ||
| 100 | <P> | |
| 101 | <div class="seealso"> | |
| 102 | <p class="heading">See Also:</p> | |
| 103 | ||
| 104 | <dl compact="compact" class="seerfc"> | |
| 105 | <dt><a href="http://www.python.org/peps/pep-0305.html" | |
| 106 | title="CSV File API" | |
| 107 | >PEP 305, <em>CSV File API</em></a> | |
| 108 | <dd>The Python Enhancement Proposal which proposed this addition | |
| 109 | to Python. | |
| 110 | </dl> | |
| 111 | </div> | |
| 112 | ||
| 113 | <P> | |
| 114 | ||
| 115 | <p><br /></p><hr class='online-navigation' /> | |
| 116 | <div class='online-navigation'> | |
| 117 | <!--Table of Child-Links--> | |
| 118 | <A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a> | |
| 119 | ||
| 120 | <UL CLASS="ChildLinks"> | |
| 121 | <LI><A href="csv-contents.html">12.20.1 Module Contents</a> | |
| 122 | <LI><A href="csv-fmt-params.html">12.20.2 Dialects and Formatting Parameters</a> | |
| 123 | <LI><A href="node634.html">12.20.3 Reader Objects</a> | |
| 124 | <LI><A href="node635.html">12.20.4 Writer Objects</a> | |
| 125 | <LI><A href="node636.html">12.20.5 Examples</a> | |
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| 161 | </div> | |
| 162 | </div> | |
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| 164 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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