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| <div class="section" id="pyarrow-parquet-parquetwriter"> |
| <h1>pyarrow.parquet.ParquetWriter<a class="headerlink" href="#pyarrow-parquet-parquetwriter" title="Permalink to this headline">¶</a></h1> |
| <dl class="py class"> |
| <dt id="pyarrow.parquet.ParquetWriter"> |
| <em class="property">class </em><code class="sig-prename descclassname">pyarrow.parquet.</code><code class="sig-name descname">ParquetWriter</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">where</span></em>, <em class="sig-param"><span class="n">schema</span></em>, <em class="sig-param"><span class="n">filesystem</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">flavor</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">version</span><span class="o">=</span><span class="default_value">'1.0'</span></em>, <em class="sig-param"><span class="n">use_dictionary</span><span class="o">=</span><span class="default_value">True</span></em>, <em class="sig-param"><span class="n">compression</span><span class="o">=</span><span class="default_value">'snappy'</span></em>, <em class="sig-param"><span class="n">write_statistics</span><span class="o">=</span><span class="default_value">True</span></em>, <em class="sig-param"><span class="n">use_deprecated_int96_timestamps</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">compression_level</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">use_byte_stream_split</span><span class="o">=</span><span class="default_value">False</span></em>, <em class="sig-param"><span class="n">writer_engine_version</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">data_page_version</span><span class="o">=</span><span class="default_value">'1.0'</span></em>, <em class="sig-param"><span class="o">**</span><span class="n">options</span></em><span class="sig-paren">)</span><a class="reference internal" href="../../_modules/pyarrow/parquet.html#ParquetWriter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyarrow.parquet.ParquetWriter" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p> |
| <p>Class for incrementally building a Parquet file for Arrow tables.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>where</strong> (<em>path</em><em> or </em><em>file-like object</em>) – </p></li> |
| <li><p><strong>schema</strong> (<em>arrow Schema</em>) – </p></li> |
| <li><p><strong>version</strong> (<em>{"1.0"</em><em>, </em><em>"2.0"}</em><em>, </em><em>default "1.0"</em>) – Determine which Parquet logical types are available for use, whether the |
| reduced set from the Parquet 1.x.x format or the expanded logical types |
| added in format version 2.0.0 and after. Note that files written with |
| version=’2.0’ may not be readable in all Parquet implementations, so |
| version=’1.0’ is likely the choice that maximizes file compatibility. Some |
| features, such as lossless storage of nanosecond timestamps as INT64 |
| physical storage, are only available with version=’2.0’. The Parquet 2.0.0 |
| format version also introduced a new serialized data page format; this can |
| be enabled separately using the data_page_version option.</p></li> |
| <li><p><strong>use_dictionary</strong> (<em>bool</em><em> or </em><em>list</em>) – Specify if we should use dictionary encoding in general or only for |
| some columns.</p></li> |
| <li><p><strong>use_deprecated_int96_timestamps</strong> (<em>bool</em><em>, </em><em>default None</em>) – Write timestamps to INT96 Parquet format. Defaults to False unless enabled |
| by flavor argument. This take priority over the coerce_timestamps option.</p></li> |
| <li><p><strong>coerce_timestamps</strong> (<em>str</em><em>, </em><em>default None</em>) – Cast timestamps a particular resolution. The defaults depends on <cite>version</cite>. |
| For <code class="docutils literal notranslate"><span class="pre">version='1.0'</span></code> (the default), nanoseconds will be cast to |
| microseconds (‘us’), and seconds to milliseconds (‘ms’) by default. For |
| <code class="docutils literal notranslate"><span class="pre">version='2.0'</span></code>, the original resolution is preserved and no casting |
| is done by default. The casting might result in loss of data, in which |
| case <code class="docutils literal notranslate"><span class="pre">allow_truncated_timestamps=True</span></code> can be used to suppress the |
| raised exception. |
| Valid values: {None, ‘ms’, ‘us’}</p></li> |
| <li><p><strong>data_page_size</strong> (<em>int</em><em>, </em><em>default None</em>) – Set a target threshold for the approximate encoded size of data |
| pages within a column chunk (in bytes). If None, use the default data page |
| size of 1MByte.</p></li> |
| <li><p><strong>allow_truncated_timestamps</strong> (<em>bool</em><em>, </em><em>default False</em>) – Allow loss of data when coercing timestamps to a particular |
| resolution. E.g. if microsecond or nanosecond data is lost when coercing to |
| ‘ms’, do not raise an exception.</p></li> |
| <li><p><strong>compression</strong> (<em>str</em><em> or </em><em>dict</em>) – Specify the compression codec, either on a general basis or per-column. |
| Valid values: {‘NONE’, ‘SNAPPY’, ‘GZIP’, ‘LZO’, ‘BROTLI’, ‘LZ4’, ‘ZSTD’}.</p></li> |
| <li><p><strong>write_statistics</strong> (<em>bool</em><em> or </em><em>list</em>) – Specify if we should write statistics in general (default is True) or only |
| for some columns.</p></li> |
| <li><p><strong>flavor</strong> (<em>{'spark'}</em><em>, </em><em>default None</em>) – Sanitize schema or set other compatibility options to work with |
| various target systems.</p></li> |
| <li><p><strong>filesystem</strong> (<a class="reference internal" href="pyarrow.fs.FileSystem.html#pyarrow.fs.FileSystem" title="pyarrow.fs.FileSystem"><em>FileSystem</em></a><em>, </em><em>default None</em>) – If nothing passed, will be inferred from <cite>where</cite> if path-like, else |
| <cite>where</cite> is already a file-like object so no filesystem is needed.</p></li> |
| <li><p><strong>compression_level</strong> (<em>int</em><em> or </em><em>dict</em><em>, </em><em>default None</em>) – Specify the compression level for a codec, either on a general basis or |
| per-column. If None is passed, arrow selects the compression level for |
| the compression codec in use. The compression level has a different |
| meaning for each codec, so you have to read the documentation of the |
| codec you are using. |
| An exception is thrown if the compression codec does not allow specifying |
| a compression level.</p></li> |
| <li><p><strong>use_byte_stream_split</strong> (<em>bool</em><em> or </em><em>list</em><em>, </em><em>default False</em>) – Specify if the byte_stream_split encoding should be used in general or |
| only for some columns. If both dictionary and byte_stream_stream are |
| enabled, then dictionary is preferred. |
| The byte_stream_split encoding is valid only for floating-point data types |
| and should be combined with a compression codec.</p></li> |
| <li><p><strong>data_page_version</strong> (<em>{"1.0"</em><em>, </em><em>"2.0"}</em><em>, </em><em>default "1.0"</em>) – The serialized Parquet data page format version to write, defaults to |
| 1.0. This does not impact the file schema logical types and Arrow to |
| Parquet type casting behavior; for that use the “version” option.</p></li> |
| <li><p><strong>**options</strong> (<em>dict</em>) – If options contains a key <cite>metadata_collector</cite> then the |
| corresponding value is assumed to be a list (or any object with |
| <cite>.append</cite> method) that will be filled with the file metadata instance |
| of the written file.</p></li> |
| </ul> |
| </dd> |
| </dl> |
| <dl class="py method"> |
| <dt id="pyarrow.parquet.ParquetWriter.__init__"> |
| <code class="sig-name descname">__init__</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">where</span></em>, <em class="sig-param"><span class="n">schema</span></em>, <em class="sig-param"><span class="n">filesystem</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">flavor</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">version</span><span class="o">=</span><span class="default_value">'1.0'</span></em>, <em class="sig-param"><span class="n">use_dictionary</span><span class="o">=</span><span class="default_value">True</span></em>, <em class="sig-param"><span class="n">compression</span><span class="o">=</span><span class="default_value">'snappy'</span></em>, <em class="sig-param"><span class="n">write_statistics</span><span class="o">=</span><span class="default_value">True</span></em>, <em class="sig-param"><span class="n">use_deprecated_int96_timestamps</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">compression_level</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">use_byte_stream_split</span><span class="o">=</span><span class="default_value">False</span></em>, <em class="sig-param"><span class="n">writer_engine_version</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">data_page_version</span><span class="o">=</span><span class="default_value">'1.0'</span></em>, <em class="sig-param"><span class="o">**</span><span class="n">options</span></em><span class="sig-paren">)</span><a class="reference internal" href="../../_modules/pyarrow/parquet.html#ParquetWriter.__init__"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyarrow.parquet.ParquetWriter.__init__" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Initialize self. See help(type(self)) for accurate signature.</p> |
| </dd></dl> |
| |
| <p class="rubric">Methods</p> |
| <table class="longtable docutils align-default"> |
| <colgroup> |
| <col style="width: 10%" /> |
| <col style="width: 90%" /> |
| </colgroup> |
| <tbody> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.parquet.ParquetWriter.__init__" title="pyarrow.parquet.ParquetWriter.__init__"><code class="xref py py-obj docutils literal notranslate"><span class="pre">__init__</span></code></a>(where, schema[, filesystem, …])</p></td> |
| <td><p>Initialize self.</p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.parquet.ParquetWriter.close" title="pyarrow.parquet.ParquetWriter.close"><code class="xref py py-obj docutils literal notranslate"><span class="pre">close</span></code></a>()</p></td> |
| <td><p></p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.parquet.ParquetWriter.write_table" title="pyarrow.parquet.ParquetWriter.write_table"><code class="xref py py-obj docutils literal notranslate"><span class="pre">write_table</span></code></a>(table[, row_group_size])</p></td> |
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| <dl class="py method"> |
| <dt id="pyarrow.parquet.ParquetWriter.close"> |
| <code class="sig-name descname">close</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../../_modules/pyarrow/parquet.html#ParquetWriter.close"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyarrow.parquet.ParquetWriter.close" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="py method"> |
| <dt id="pyarrow.parquet.ParquetWriter.write_table"> |
| <code class="sig-name descname">write_table</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">table</span></em>, <em class="sig-param"><span class="n">row_group_size</span><span class="o">=</span><span class="default_value">None</span></em><span class="sig-paren">)</span><a class="reference internal" href="../../_modules/pyarrow/parquet.html#ParquetWriter.write_table"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyarrow.parquet.ParquetWriter.write_table" title="Permalink to this definition">¶</a></dt> |
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