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This article is to share with you about how to use the freeze command migration module in python3, the editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

Python3 installs virtual environment # 1. Install the virtual environment pip3 install virtualenv#2. Create a virtual environment python3-m venv venv# or python3-m venv. # 3. Activate the virtual environment before starting to work, activate the corresponding virtual environment:. When venv/bin/activate is activated under Windows: venv\ Scripts\ activate#, your terminal prompt will display the name of the virtual environment. Use freeze to move all modules # Export the installation module document pip freeze > my_freeze.txt# or specify the address pip freeze > e:\ my_freeze.txt# in another environment, install the module pip install-r my_freeze.txt in this document

This is a very vivid model because in computer concurrency scenarios, the number of certain resources is often limited. It is most likely preempted by multiple threads. If mishandled, everyone gets one resource and waits for another.

There are many ways to solve the deadlock problem. Here we introduce a relatively simple method to number these locks. When a thread needs to hold multiple locks at the same time, it must access the locks in ascending order. We can easily do this with the context manager.

The above is how to use the freeze command migration module in python3. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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