[libvirt] [PATCHv2 12/25] WmiClass: Don't share "versions" between instances

Lists in Python are mutable and when used as a default value of a parameter for class constructor, its value will be shared between all class instances. Example: class Test: def __init__(self, mylist=[]): self.mylist = mylist A = Test() B = Test() A.mylist.append("mylist from instance A") print(B.mylist) # Will print ['mylist from instance A'] Signed-off-by: Radostin Stoyanov <rstoyanov1(a)gmail.com&gt; --- src/hyperv/hyperv_wmi_generator.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/hyperv/hyperv_wmi_generator.py b/src/hyperv/hyperv_wmi_generator.py index 6e98f0a89..0dcd9e438 100755 --- a/src/hyperv/hyperv_wmi_generator.py +++ b/src/hyperv/hyperv_wmi_generator.py @@ -44,9 +44,9 @@ class WmiClass: to. """ - def __init__(self, name, versions = []): + def __init__(self, name, versions=None): self.name = name - self.versions = versions + self.versions = versions if versions else list() self.common = None -- 2.14.3