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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<title>20.6. base64 —— Base16、Base32、Base64、Base85 資料編碼 — Python 3.7.0 說明文件</title>
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<div class="section" id="module-base64">
<span id="base64-base16-base32-base64-base85-data-encodings"></span><h1>20.6. <a class="reference internal" href="#module-base64" title="base64: RFC 3548: Base16, Base32, Base64 Data Encodings; Base85 and Ascii85"><code class="xref py py-mod docutils literal notranslate"><span class="pre">base64</span></code></a> —— Base16、Base32、Base64、Base85 資料編碼<a class="headerlink" href="#module-base64" title="本標題的永久連結">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.7/Lib/base64.py">Lib/base64.py</a></p>
<hr class="docutils" id="index-0" />
<p>這個模組提供將二進位資料編碼成可顯示 ASCII 字元以及解碼回原始資料的功能，包括了<span class="target" id="index-12"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc3548.html"><strong>RFC 3548</strong></a>中的 Base16、Base32、Base64 等編碼方式，以及標準 Ascii85、Base85 編碼等。</p>
<p><span class="target" id="index-13"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc3548.html"><strong>RFC 3548</strong></a>標準編碼可以使電子郵件、URL，或是 HTTP POST 內容等傳輸管道安全地傳遞資料。這些編碼演算法與<strong class="program">uuencode</strong> 並不相同。</p>
<p>There are two interfaces provided by this module. The modern interface
supports encoding <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like objects</span></a> to ASCII
<a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>, and decoding <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like objects</span></a> or
strings containing ASCII to <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>. Both base-64 alphabets
defined in <span class="target" id="index-3"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc3548.html"><strong>RFC 3548</strong></a> (normal, and URL- and filesystem-safe) are supported.</p>
<p>The legacy interface does not support decoding from strings, but it does
provide functions for encoding and decoding to and from <a class="reference internal" href="../glossary.html#term-file-object"><span class="xref std std-term">file objects</span></a>. It only supports the Base64 standard alphabet, and it adds
newlines every 76 characters as per <span class="target" id="index-4"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2045.html"><strong>RFC 2045</strong></a>. Note that if you are looking
for <span class="target" id="index-5"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2045.html"><strong>RFC 2045</strong></a> support you probably want to be looking at the <a class="reference internal" href="email.html#module-email" title="email: Package supporting the parsing, manipulating, and generating email messages."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email</span></code></a>
package instead.</p>
<div class="versionchanged">
<p><span class="versionmodified">3.3 版更變: </span>ASCII-only Unicode strings are now accepted by the decoding functions of
the modern interface.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified">3.4 版更變: </span>Any <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like objects</span></a> are now accepted by all
encoding and decoding functions in this module. Ascii85/Base85 support added.</p>
</div>
<p>The modern interface provides:</p>
<dl class="function">
<dt id="base64.b64encode">
<code class="descclassname">base64.</code><code class="descname">b64encode</code><span class="sig-paren">(</span><em>s</em>, <em>altchars=None</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.b64encode" title="本定義的永久連結">¶</a></dt>
<dd><p>Encode the <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> <em>s</em> using Base64 and return the encoded
<a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
<p>Optional <em>altchars</em> must be a <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> of at least
length 2 (additional characters are ignored) which specifies an alternative
alphabet for the <code class="docutils literal notranslate"><span class="pre">+</span></code> and <code class="docutils literal notranslate"><span class="pre">/</span></code> characters. This allows an application to e.g.
generate URL or filesystem safe Base64 strings. The default is <code class="docutils literal notranslate"><span class="pre">None</span></code>, for
which the standard Base64 alphabet is used.</p>
</dd></dl>
<dl class="function">
<dt id="base64.b64decode">
<code class="descclassname">base64.</code><code class="descname">b64decode</code><span class="sig-paren">(</span><em>s</em>, <em>altchars=None</em>, <em>validate=False</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.b64decode" title="本定義的永久連結">¶</a></dt>
<dd><p>Decode the Base64 encoded <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> or ASCII string
<em>s</em> and return the decoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
<p>Optional <em>altchars</em> must be a <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> or ASCII string of
at least length 2 (additional characters are ignored) which specifies the
alternative alphabet used instead of the <code class="docutils literal notranslate"><span class="pre">+</span></code> and <code class="docutils literal notranslate"><span class="pre">/</span></code> characters.</p>
<p>A <a class="reference internal" href="binascii.html#binascii.Error" title="binascii.Error"><code class="xref py py-exc docutils literal notranslate"><span class="pre">binascii.Error</span></code></a> exception is raised
if <em>s</em> is incorrectly padded.</p>
<p>If <em>validate</em> is <code class="docutils literal notranslate"><span class="pre">False</span></code> (the default), characters that are neither
in the normal base-64 alphabet nor the alternative alphabet are
discarded prior to the padding check. If <em>validate</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code>,
these non-alphabet characters in the input result in a
<a class="reference internal" href="binascii.html#binascii.Error" title="binascii.Error"><code class="xref py py-exc docutils literal notranslate"><span class="pre">binascii.Error</span></code></a>.</p>
</dd></dl>
<dl class="function">
<dt id="base64.standard_b64encode">
<code class="descclassname">base64.</code><code class="descname">standard_b64encode</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.standard_b64encode" title="本定義的永久連結">¶</a></dt>
<dd><p>Encode <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> <em>s</em> using the standard Base64 alphabet
and return the encoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
</dd></dl>
<dl class="function">
<dt id="base64.standard_b64decode">
<code class="descclassname">base64.</code><code class="descname">standard_b64decode</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.standard_b64decode" title="本定義的永久連結">¶</a></dt>
<dd><p>Decode <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> or ASCII string <em>s</em> using the standard
Base64 alphabet and return the decoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
</dd></dl>
<dl class="function">
<dt id="base64.urlsafe_b64encode">
<code class="descclassname">base64.</code><code class="descname">urlsafe_b64encode</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.urlsafe_b64encode" title="本定義的永久連結">¶</a></dt>
<dd><p>Encode <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> <em>s</em> using the
URL- and filesystem-safe alphabet, which
substitutes <code class="docutils literal notranslate"><span class="pre">-</span></code> instead of <code class="docutils literal notranslate"><span class="pre">+</span></code> and <code class="docutils literal notranslate"><span class="pre">_</span></code> instead of <code class="docutils literal notranslate"><span class="pre">/</span></code> in the
standard Base64 alphabet, and return the encoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>. The result
can still contain <code class="docutils literal notranslate"><span class="pre">=</span></code>.</p>
</dd></dl>
<dl class="function">
<dt id="base64.urlsafe_b64decode">
<code class="descclassname">base64.</code><code class="descname">urlsafe_b64decode</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.urlsafe_b64decode" title="本定義的永久連結">¶</a></dt>
<dd><p>Decode <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> or ASCII string <em>s</em>
using the URL- and filesystem-safe
alphabet, which substitutes <code class="docutils literal notranslate"><span class="pre">-</span></code> instead of <code class="docutils literal notranslate"><span class="pre">+</span></code> and <code class="docutils literal notranslate"><span class="pre">_</span></code> instead of
<code class="docutils literal notranslate"><span class="pre">/</span></code> in the standard Base64 alphabet, and return the decoded
<a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
</dd></dl>
<dl class="function">
<dt id="base64.b32encode">
<code class="descclassname">base64.</code><code class="descname">b32encode</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.b32encode" title="本定義的永久連結">¶</a></dt>
<dd><p>Encode the <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> <em>s</em> using Base32 and return the
encoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
</dd></dl>
<dl class="function">
<dt id="base64.b32decode">
<code class="descclassname">base64.</code><code class="descname">b32decode</code><span class="sig-paren">(</span><em>s</em>, <em>casefold=False</em>, <em>map01=None</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.b32decode" title="本定義的永久連結">¶</a></dt>
<dd><p>Decode the Base32 encoded <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> or ASCII string <em>s</em> and
return the decoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
<p>Optional <em>casefold</em> is a flag specifying
whether a lowercase alphabet is acceptable as input. For security purposes,
the default is <code class="docutils literal notranslate"><span class="pre">False</span></code>.</p>
<p><span class="target" id="index-6"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc3548.html"><strong>RFC 3548</strong></a> allows for optional mapping of the digit 0 (zero) to the letter O
(oh), and for optional mapping of the digit 1 (one) to either the letter I (eye)
or letter L (el). The optional argument <em>map01</em> when not <code class="docutils literal notranslate"><span class="pre">None</span></code>, specifies
which letter the digit 1 should be mapped to (when <em>map01</em> is not <code class="docutils literal notranslate"><span class="pre">None</span></code>, the
digit 0 is always mapped to the letter O). For security purposes the default is
<code class="docutils literal notranslate"><span class="pre">None</span></code>, so that 0 and 1 are not allowed in the input.</p>
<p>A <a class="reference internal" href="binascii.html#binascii.Error" title="binascii.Error"><code class="xref py py-exc docutils literal notranslate"><span class="pre">binascii.Error</span></code></a> is raised if <em>s</em> is
incorrectly padded or if there are non-alphabet characters present in the
input.</p>
</dd></dl>
<dl class="function">
<dt id="base64.b16encode">
<code class="descclassname">base64.</code><code class="descname">b16encode</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.b16encode" title="本定義的永久連結">¶</a></dt>
<dd><p>Encode the <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> <em>s</em> using Base16 and return the
encoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
</dd></dl>
<dl class="function">
<dt id="base64.b16decode">
<code class="descclassname">base64.</code><code class="descname">b16decode</code><span class="sig-paren">(</span><em>s</em>, <em>casefold=False</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.b16decode" title="本定義的永久連結">¶</a></dt>
<dd><p>Decode the Base16 encoded <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> or ASCII string <em>s</em> and
return the decoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
<p>Optional <em>casefold</em> is a flag specifying whether a
lowercase alphabet is acceptable as input. For security purposes, the default
is <code class="docutils literal notranslate"><span class="pre">False</span></code>.</p>
<p>A <a class="reference internal" href="binascii.html#binascii.Error" title="binascii.Error"><code class="xref py py-exc docutils literal notranslate"><span class="pre">binascii.Error</span></code></a> is raised if <em>s</em> is
incorrectly padded or if there are non-alphabet characters present in the
input.</p>
</dd></dl>
<dl class="function">
<dt id="base64.a85encode">
<code class="descclassname">base64.</code><code class="descname">a85encode</code><span class="sig-paren">(</span><em>b</em>, <em>*</em>, <em>foldspaces=False</em>, <em>wrapcol=0</em>, <em>pad=False</em>, <em>adobe=False</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.a85encode" title="本定義的永久連結">¶</a></dt>
<dd><p>Encode the <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> <em>b</em> using Ascii85 and return the
encoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
<p><em>foldspaces</em> is an optional flag that uses the special short sequence 『y』
instead of 4 consecutive spaces (ASCII 0x20) as supported by 『btoa』. This
feature is not supported by the 「standard」 Ascii85 encoding.</p>
<p><em>wrapcol</em> controls whether the output should have newline (<code class="docutils literal notranslate"><span class="pre">b'\n'</span></code>)
characters added to it. If this is non-zero, each output line will be
at most this many characters long.</p>
<p><em>pad</em> controls whether the input is padded to a multiple of 4
before encoding. Note that the <code class="docutils literal notranslate"><span class="pre">btoa</span></code> implementation always pads.</p>
<p><em>adobe</em> controls whether the encoded byte sequence is framed with <code class="docutils literal notranslate"><span class="pre"><~</span></code>
and <code class="docutils literal notranslate"><span class="pre">~></span></code>, which is used by the Adobe implementation.</p>
<div class="versionadded">
<p><span class="versionmodified">3.4 版新加入.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="base64.a85decode">
<code class="descclassname">base64.</code><code class="descname">a85decode</code><span class="sig-paren">(</span><em>b</em>, <em>*</em>, <em>foldspaces=False</em>, <em>adobe=False</em>, <em>ignorechars=b' \t\n\r\v'</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.a85decode" title="本定義的永久連結">¶</a></dt>
<dd><p>Decode the Ascii85 encoded <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> or ASCII string <em>b</em> and
return the decoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
<p><em>foldspaces</em> is a flag that specifies whether the 『y』 short sequence
should be accepted as shorthand for 4 consecutive spaces (ASCII 0x20).
This feature is not supported by the 「standard」 Ascii85 encoding.</p>
<p><em>adobe</em> controls whether the input sequence is in Adobe Ascii85 format
(i.e. is framed with <~ and ~>).</p>
<p><em>ignorechars</em> should be a <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> or ASCII string
containing characters to ignore
from the input. This should only contain whitespace characters, and by
default contains all whitespace characters in ASCII.</p>
<div class="versionadded">
<p><span class="versionmodified">3.4 版新加入.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="base64.b85encode">
<code class="descclassname">base64.</code><code class="descname">b85encode</code><span class="sig-paren">(</span><em>b</em>, <em>pad=False</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.b85encode" title="本定義的永久連結">¶</a></dt>
<dd><p>Encode the <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> <em>b</em> using base85 (as used in e.g.
git-style binary diffs) and return the encoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
<p>If <em>pad</em> is true, the input is padded with <code class="docutils literal notranslate"><span class="pre">b'\0'</span></code> so its length is a
multiple of 4 bytes before encoding.</p>
<div class="versionadded">
<p><span class="versionmodified">3.4 版新加入.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="base64.b85decode">
<code class="descclassname">base64.</code><code class="descname">b85decode</code><span class="sig-paren">(</span><em>b</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.b85decode" title="本定義的永久連結">¶</a></dt>
<dd><p>Decode the base85-encoded <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> or ASCII string <em>b</em> and
return the decoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>. Padding is implicitly removed, if
necessary.</p>
<div class="versionadded">
<p><span class="versionmodified">3.4 版新加入.</span></p>
</div>
</dd></dl>
<p>The legacy interface:</p>
<dl class="function">
<dt id="base64.decode">
<code class="descclassname">base64.</code><code class="descname">decode</code><span class="sig-paren">(</span><em>input</em>, <em>output</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.decode" title="本定義的永久連結">¶</a></dt>
<dd><p>Decode the contents of the binary <em>input</em> file and write the resulting binary
data to the <em>output</em> file. <em>input</em> and <em>output</em> must be <a class="reference internal" href="../glossary.html#term-file-object"><span class="xref std std-term">file objects</span></a>. <em>input</em> will be read until <code class="docutils literal notranslate"><span class="pre">input.readline()</span></code> returns an
empty bytes object.</p>
</dd></dl>
<dl class="function">
<dt id="base64.decodebytes">
<code class="descclassname">base64.</code><code class="descname">decodebytes</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.decodebytes" title="本定義的永久連結">¶</a></dt>
<dd><p>Decode the <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> <em>s</em>, which must contain one or more
lines of base64 encoded data, and return the decoded <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a>.</p>
<div class="versionadded">
<p><span class="versionmodified">3.1 版新加入.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="base64.decodestring">
<code class="descclassname">base64.</code><code class="descname">decodestring</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.decodestring" title="本定義的永久連結">¶</a></dt>
<dd><p>Deprecated alias of <a class="reference internal" href="#base64.decodebytes" title="base64.decodebytes"><code class="xref py py-func docutils literal notranslate"><span class="pre">decodebytes()</span></code></a>.</p>
<div class="deprecated">
<p><span class="versionmodified">3.1 版後已棄用.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="base64.encode">
<code class="descclassname">base64.</code><code class="descname">encode</code><span class="sig-paren">(</span><em>input</em>, <em>output</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.encode" title="本定義的永久連結">¶</a></dt>
<dd><p>Encode the contents of the binary <em>input</em> file and write the resulting base64
encoded data to the <em>output</em> file. <em>input</em> and <em>output</em> must be <a class="reference internal" href="../glossary.html#term-file-object"><span class="xref std std-term">file
objects</span></a>. <em>input</em> will be read until <code class="docutils literal notranslate"><span class="pre">input.read()</span></code> returns
an empty bytes object. <a class="reference internal" href="#base64.encode" title="base64.encode"><code class="xref py py-func docutils literal notranslate"><span class="pre">encode()</span></code></a> inserts a newline character (<code class="docutils literal notranslate"><span class="pre">b'\n'</span></code>)
after every 76 bytes of the output, as well as ensuring that the output
always ends with a newline, as per <span class="target" id="index-7"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2045.html"><strong>RFC 2045</strong></a> (MIME).</p>
</dd></dl>
<dl class="function">
<dt id="base64.encodebytes">
<code class="descclassname">base64.</code><code class="descname">encodebytes</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.encodebytes" title="本定義的永久連結">¶</a></dt>
<dd><p>Encode the <a class="reference internal" href="../glossary.html#term-bytes-like-object"><span class="xref std std-term">bytes-like object</span></a> <em>s</em>, which can contain arbitrary binary
data, and return <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a> containing the base64-encoded data, with newlines
(<code class="docutils literal notranslate"><span class="pre">b'\n'</span></code>) inserted after every 76 bytes of output, and ensuring that
there is a trailing newline, as per <span class="target" id="index-8"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2045.html"><strong>RFC 2045</strong></a> (MIME).</p>
<div class="versionadded">
<p><span class="versionmodified">3.1 版新加入.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="base64.encodestring">
<code class="descclassname">base64.</code><code class="descname">encodestring</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#base64.encodestring" title="本定義的永久連結">¶</a></dt>
<dd><p>Deprecated alias of <a class="reference internal" href="#base64.encodebytes" title="base64.encodebytes"><code class="xref py py-func docutils literal notranslate"><span class="pre">encodebytes()</span></code></a>.</p>
<div class="deprecated">
<p><span class="versionmodified">3.1 版後已棄用.</span></p>
</div>
</dd></dl>
<p>An example usage of the module:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">base64</span>
<span class="gp">>>> </span><span class="n">encoded</span> <span class="o">=</span> <span class="n">base64</span><span class="o">.</span><span class="n">b64encode</span><span class="p">(</span><span class="sa">b</span><span class="s1">'data to be encoded'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">encoded</span>
<span class="go">b'ZGF0YSB0byBiZSBlbmNvZGVk'</span>
<span class="gp">>>> </span><span class="n">data</span> <span class="o">=</span> <span class="n">base64</span><span class="o">.</span><span class="n">b64decode</span><span class="p">(</span><span class="n">encoded</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">data</span>
<span class="go">b'data to be encoded'</span>
</pre></div>
</div>
<div class="admonition seealso">
<p class="first admonition-title">也參考</p>
<dl class="last docutils">
<dt>Module <a class="reference internal" href="binascii.html#module-binascii" title="binascii: Tools for converting between binary and various ASCII-encoded binary representations."><code class="xref py py-mod docutils literal notranslate"><span class="pre">binascii</span></code></a></dt>
<dd>Support module containing ASCII-to-binary and binary-to-ASCII conversions.</dd>
<dt><span class="target" id="index-9"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc1521.html"><strong>RFC 1521</strong></a> - MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies</dt>
<dd>Section 5.2, 「Base64 Content-Transfer-Encoding,」 provides the definition of the
base64 encoding.</dd>
</dl>
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