mirror of
https://github.com/github/codeql.git
synced 2026-01-04 10:10:20 +01:00
46 lines
1.9 KiB
XML
46 lines
1.9 KiB
XML
<!DOCTYPE qhelp PUBLIC
|
|
"-//Semmle//qhelp//EN"
|
|
"qhelp.dtd">
|
|
<qhelp>
|
|
<overview>
|
|
<p>
|
|
A call to the <code>__init__</code> method of a class must supply an argument
|
|
for each parameter that does not have a default value defined, so:
|
|
</p>
|
|
<ul>
|
|
<li>The minimum number of arguments is the number of parameters without default values.</li>
|
|
<li>The maximum number of arguments is the total number of parameters, unless
|
|
the class <code>__init__</code> method takes a varargs (starred) parameter in
|
|
which case there is no limit.</li>
|
|
</ul>
|
|
</overview>
|
|
<recommendation>
|
|
<p>If there are too few arguments then check to see which arguments have been omitted and supply values for those.</p>
|
|
|
|
<p>If there are too many arguments then check to see if any have been added by mistake and remove those.</p>
|
|
|
|
<p>
|
|
Also check where a comma has been inserted instead of an operator or a dot.
|
|
For example, the code is <code>obj,attr</code> when it should be <code>obj.attr</code>.
|
|
</p>
|
|
|
|
<p> If it is not clear which are the missing or surplus arguments, then this suggests a logical error.
|
|
The fix will then depend on the nature of the error.
|
|
</p>
|
|
|
|
</recommendation>
|
|
<example>
|
|
<sample src="WrongNumberArgumentsInClassInstantiation.py"/>
|
|
</example>
|
|
|
|
<references>
|
|
|
|
<li>Python Glossary: <a href="https://docs.python.org/2/glossary.html#term-argument">Arguments</a>.</li>
|
|
<li>Python Glossary: <a href="https://docs.python.org/glossary.html#term-parameter">Parameters</a>.</li>
|
|
<li>Python Programming FAQ: <a href="https://docs.python.org/2/faq/programming.html#faq-argument-vs-parameter">
|
|
What is the difference between arguments and parameters?</a>.</li>
|
|
<li>The Python Language Reference: <a href="https://docs.python.org/3/reference/datamodel.html#object.__init__">Data model: object.__init__</a></li>
|
|
<li>The Python Tutorial: <a href="https://docs.python.org/3/tutorial/classes.html">Classes</a></li>
|
|
</references>
|
|
</qhelp>
|