* **`'encoding=None'` means default encoding is used, which is platform dependent. Best practice is to use `'encoding="utf-8"'` whenever possible.**

* **`'newline=None'` means all different end of line combinations are converted to '\n' on read, while on write all '\n' characters are converted to system's default line separator.**

* **`'r'` - Read (default).**

<str/bytes> = <file>.read(size=-1) # Reads 'size' chars/bytes or until EOF.

<str/bytes> = <file>.readline() # Returns a line or empty string on EOF.

<str/bytes> = next(<file>) # Returns a line using buffer. Do not mix.

<li><strong><code class="python hljs"><span class="hljs-string">'encoding=None'</span></code> means default encoding is used, which is platform dependent. Best practice is to use <code class="python hljs"><span class="hljs-string">'encoding="utf-8"'</span></code> whenever possible.</strong></li>

<li><strong><code class="python hljs"><span class="hljs-string">'newline=None'</span></code> means all different end of line combinations are converted to '\n' on read, while on write all '\n' characters are converted to system's default line separator.</strong></li>

<div><h3 id="modes">Modes</h3><ul>

<li><strong><code class="python hljs"><span class="hljs-string">'r'</span></code> - Read (default).</strong></li>

<pre><code class="python language-python hljs">&lt;str/bytes&gt; = &lt;file&gt;.read(size=<span class="hljs-number">-1</span>) <span class="hljs-comment"># Reads 'size' chars/bytes or until EOF.</span>

&lt;str/bytes&gt; = &lt;file&gt;.readline() <span class="hljs-comment"># Returns a line or empty string on EOF.</span>

&lt;str/bytes&gt; = next(&lt;file&gt;) <span class="hljs-comment"># Returns a line using buffer. Do not mix.</span>

<pre><code class="python language-python hljs">&lt;file&gt;.write(&lt;str/bytes&gt;) <span class="hljs-comment"># Writes a string or bytes object.</span>