python-3.9

来源： https://stackoverflow.com/questions/64404523/issues-with-installing-matplotlib-on-windows-10-with-pipwin

来源： https://stackoverflow.com/questions/64210846/when-to-use-dictionary-merge-vs-update-operator

来源： https://stackoverflow.com/questions/64210846/when-to-use-dictionary-merge-vs-update-operator

来源： https://stackoverflow.com/questions/64010263/gcloud-not-working-with-fedora33-and-python3-9

来源： https://stackoverflow.com/questions/63216201/how-to-install-python3-9-with-conda

来源： https://stackoverflow.com/questions/63216201/how-to-install-python3-9-with-conda

来源： https://stackoverflow.com/questions/63216201/how-to-install-python3-9-with-conda

来源： https://stackoverflow.com/questions/63216201/how-to-install-python3-9-with-conda

来源： https://stackoverflow.com/questions/63216201/how-to-install-python3-9-with-conda

问题 In python 3.9, dictionaries gained combine | and update |= operators. Is there a dunder/magic method which will enable this to be used for other classes? I've tried looking in the python source but found it a bit bewildering. 回答1: Yes, | and |= correspond to __or__ and __ior__. Don't look at the python source code , look at the documentation. In particular, the data model. See here And note, this isn't specific to python 3.9. 回答2: Yes, the method for | is __or__ and the method for |= is __ior