[modeller_usage] Use $SGE_TASK_ID in the python script

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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!