[modeller_usage] Use $SGE_TASK_ID in the python script

This thread told me to use $SGE_TASK_ID to generate random integer https://salilab.org/archives/modeller_usage/2020/msg00077.html

I tried: random_integer = int(-1*str($SGE_TASK_ID)[-4:])  # so that the number is within the range of (-50000, -2)

But I was told the $ sign is invalid: random_integer = int(-1*str($SGE_TASK_ID)[-4:])                                            ^ SyntaxError: invalid syntax

So is that possible to use the job ID (e.g. 7172646) as an variable in the python environment? Thank you!