__init__ method is a generator¶
ID: py/init-method-is-generator
Kind: problem
Security severity:
Severity: error
Precision: very-high
Tags:
- reliability
- correctness
Query suites:
- python-security-and-quality.qls
Click to see the query in the CodeQL repository
The __init__ method of a class is used to initialize new objects, not create them. As such, it should not return any value. By including a yield expression in the method turns it into a generator method. On calling it will return a generator resulting in a runtime error.
Recommendation¶
The presence of a yield expression in an __init__ method suggests a logical error, so it is not possible to suggest a general fix.
Example¶
In this example the __init__ method contains a yield expression. This is not logical in the context of an initializer.
class InitIsGenerator(object):
def __init__(self, i):
yield i
References¶
Python: The init method.