python-3.9

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

问题 What does dict | dict2 operation do in Python? I came across it and I am not sure what it actually does and when to use it. 回答1: New dictionary update and merge operators (Python >= 3.9) Starting with Python 3.9 it is possible to use merge ( | ) and update ( |= ) operators in Python. They are described in PEP-584. Essentially the semantics is that the value for the last duplicate key overwrites previous values and becomes the values for the key in the resulting dictionary. These operators are

问题 What does dict | dict2 operation do in Python? I came across it and I am not sure what it actually does and when to use it. 回答1: New dictionary update and merge operators (Python >= 3.9) Starting with Python 3.9 it is possible to use merge ( | ) and update ( |= ) operators in Python. They are described in PEP-584. Essentially the semantics is that the value for the last duplicate key overwrites previous values and becomes the values for the key in the resulting dictionary. These operators are

问题 Background: I have been learning Python (on MacOS) for about three months now, so please go easy on me. I began by installing Python 3.7 through Anaconda and predominantly used Jupyter Notebook to write code. As I learnt more, I found out about different text editors and IDEs, and tried out different programs: IDLE, Sublime and PyCharm. As I progressed I also learned about package management systems, such as pip and conda, and other such wonderful things that helped me achieve the things I