Background: originally, I planned to create a crawler project with scratch, but it showed Zsh: command not found: scratch . After reading many blogs, I solved the problem and decided to record it.

Main reference Blogs:

https://www.jianshu.com/p/51196153f804

https://stackoverflow.com/questions/17607944/scrapy-not-installed-correctly-on-mac

Problem analysis:

When I reinstall the script, I show:

WARNING: The script scrapy is installed in 
'/Library/Frameworks/Python.framework/Versions/3.9/bin' which is not on PATH.
  Consider adding this directory to PATH 
  or, if you prefer to suppress this warning, use --no-warn-script-location.

Note /library/frameworks/python.framework/versions/3.9/bin is not in the path. We need to add this path to the environment variable (consumer adding this directory to path).

terms of settlement:

Step 1: add source ~ /. Bash at the end of the. Zshrc file_ profile。

Open the finder, press Command + Shift + G, enter. Zshrc, open the. Zshrc file, and then write source ~ /. Bash at the end of the file_ profile。



Press Command + s to save

Open the terminal, enter source ~ /. Zshrc , and execute the file.

Step 2: in. Bash_ Add environment variables to the profile file

Open the finder, press Command + Shift + G at the same time, and enter. Bash_ Profile, open. Bash_ Profile file.

Write on the last line:

export PATH="/Library/Frameworks/Python.framework/Versions/3.9/bin:$PATH"

be careful ⚠️： The number after versions is the python version number. It should be modified according to your own Python version. If the version is 2.7, it should be changed to:

export PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:$PATH"

Press Command + s to save.

Open the terminal and enter source ~ /. Bash_ Profile , execute the file.

Finally, you can enter echo $path on the terminal to see if the environment variable is added.

You can see that /library/frameworks/python.framework/versions/2.7/bin has been added ( and many ).

Finally, enter scapy and you can finally use it!!!