Python
The default argument is mutable
Warning
New
Last modified: 03 December 2024Reports a problem when a mutable value as a list or dictionary is detected in a default value for an argument.
Default argument values are evaluated only once at function definition time, which means that modifying the default value of the argument will affect all subsequent calls of that function.
Example:
def func(s, cache={}):
cache[s] = None
When the quick-fix is applied, the code changes to:
def func(s, cache=None):
if cache is None:
cache = {}
cache[s] = None
- By ID
Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.
PyDefaultArgument
Inspection Details | |
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By default bundled with: | CLion 2024.3, IntelliJ IDEA 2024.3, PyCharm 2024.3, Qodana for JVM 2024.3, |
Can be installed with plugin: | Python Community Edition, 243.23126 |
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