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Install Python
To develop Python, you first need to download and configure a Python interpreter.
Download Python
Visit Python official website: https://www.python.org/
Click the downloads button and select the system type (windows/Mac OS/Linux, etc.) in the drop-down box
Choose to download the latest version of Python
Install Python
- Double-click the downloaded Python installation package
- Check the Add Python 3.7 to PATH option in the lower left corner, and then select Install now to install Python immediately.
- The installation is complete
Test whether the installation is successful
- Click the start button in the lower left corner of the computer, and enter cmd to enter the command line mode of windows.
Enter Python in the command line, and the Python version is displayed correctly, which means that Python is installed Add Python 3.7 to PATHsuccessfully . configuration.
Configure Python manually
Note: If the Add Python 3.7 to PATH option has been checked during the installation process, and no error is reported when entering the python command in the cmd command mode, then there is no need to manually configure Python.
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Right click on This PC --> select Properties
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Select Advanced System Settings --> Environment Variables --> Find and double-click Path
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Double-click Path, click New in the pop-up box, find the Python installation directory, and add the path to it
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The newly added path C:\Users\chris\AppData\Local\Programs\Python\Python37 is the directory where the executable file Python.exe is located after Python is installed.
Use of pip
pip is a modern, general-purpose Python package management tool. Provides the functions of searching, downloading, installing, and uninstalling Python packages, which is convenient for us to manage Python resource packages.
Install
When installing Python, it will automatically download and install pip.
configuration
In the windows command line, enter pip -Vto view the version of pip.
If you run pip -V on the command line, the following prompt appears:
It may be because the Add Python 3.7 to PATH option was not checked during the python installation process, and the pip environment variable needs to be manually configured.
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Right-click on this computer –> Environment Variables –> Find and double-click Path –> Click New in the pop-up window –> Find the pip installation directory and add the path to it.
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The newly added path C:\Users\chris\AppData\Local\Programs\Python\Python37\Scripts is the directory where the executable file pip.exe is located after Python is installed.
Manage Python packages with pip
pip install <包名>Install the specified packagepip uninstall <包名>remove the specified packagepip listshow installed packagespip freezeDisplay the installed packages and display them in the specified formatpip install -r required.txtInstall the installation packages listed in the required.txt file
Modify pip download source
Running the pip install command will download the specified python package from the website, and the default is to download it from the https://files.pythonhosted.org/ website. This is a foreign website. When the network situation is not good, the download may fail. We can modify the source of pip's current software through commands.
Format:pip install 包名 -i 国内源地址
Example: pip install flask -i https://pypi.mirrors.ustc.edu.cn/simple/Download flask (a third-party web framework based on python) from the server of University of Science and Technology of China (ustc)
List of commonly used pip download sources in China:
- Alibaba Cloud http://mirrors.aliyun.com/pypi/simple/
- University of Science and Technology of China https://pypi.mirrors.ustc.edu.cn/simple/
- Douban http://pypi.douban.com/simple/
- Tsinghua University https://pypi.tuna.tsinghua.edu.cn/simple/
- University of Science and Technology of China http://pypi.mirrors.ustc.edu.cn/simple/
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