2to3:tldr:bb762

This command is using the 2to3 tool, which is a utility in Python used to convert Python 2.x code to Python 3.x code. Here is a breakdown of the command:

• 2to3: The name of the command-line tool being executed.
• --processes=${4}: This option specifies the number of parallel processes to use for conversion. ${4} likely refers to a command-line argument provided when running the command.
• --output-dir=${path-to-python3_directory}: This option specifies the directory where the converted Python 3 code will be written. ${path-to-python3_directory} likely refers to the path of the desired output directory.
• --write: This option tells the tool to actually apply the changes and overwrite the original Python 2 code files with the converted Python 3 code.
• --nobackups: With this option, the tool does not create backup files of the original Python 2 code.
• --no-diff: This option makes the tool skip producing a diff file that shows the differences between the original and converted code.
• ${path-to-python2_directory}: This is the path to the directory containing the Python 2 code that needs to be converted.

In summary, running this command will convert Python 2 code in the specified directory to Python 3 code, using multiple processes if specified, and write the converted code directly to the specified output directory without creating backups or producing a diff file.