Some library does change my sys.path in a way that I don't want it to.
But I can't find it. The affected virtualenv has a lot of libraries installed.
I replaced sys.path with a own class which alters the modifications, but this does not help, since the code seems to alter sys.path like this:
sys.path= [...] + sys.path How can I find the "evil" code line and its stack trace?
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I found the evil code line like this.
I alter sys.globals['sys'] in sitecustomize.py:
# sitecustomize.py import sys class AttributeIsReadonly(ValueError): pass class MakeModuleAttributesReadonly(object): def __init__(self, module, readonly_attributes): self.module=module self.readonly_attributes=readonly_attributes def __setattr__(self, item, value): if item in ['module', 'readonly_attributes']: return super(MakeModuleAttributesReadonly, self).__setattr__(item, value) if item in self.readonly_attributes: raise AttributeIsReadonly('Access on attribute %r is readonly' % item) return setattr(self.module, item, value) def __getattr__(self, item): return getattr(self.module, item) sys.modules['sys']=MakeModuleAttributesReadonly(sys, ['path']) #import sys #sys.path=sys.path # this will raise the above AttributeIsReadonly It raises AttributeIsReadonly and I see the code line and the stack trace.
__add__ in VerboseSysPath.__add__ won't work if the modification gets done like this sys.path = [...] + sys.path. But thank you for the feedback, I will update the question.