Do not use empty array as default parameter

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Metadata

ID: python-security/no-empty-array-as-parameter

Language: Python

Severity: Warning

Category: Security

Description

We should never pass an empty array parameter to a function. Instead, use None and check the value if defined. This can cause unwanted behavior as the value of the argument is only evaluated once.

Read more

Avoid using empty list as default argument

Non-Compliant Code Examples

def newFunction(arg1, arg2: int, arg3 = [], arg4: MyType = []):  # do not use empty array/list as default parameter
  print("bla")

Compliant Code Examples

def newFunction(arg1, arg2: int, arg3 = None):  # do not use empty array/list as default parameter
  print("bla")