Operator //= not recognized

Hello,
I have a Perl program which includes:
```
    $time_start_h //= 18;
```

The translating generates Python with syntax error:
```
    _num(time_start_h)/ /= 18
```

`$time_start_h` is an integer.
I don't know what the operator do, but it is referecended: https://perldoc.perl.org/perlop#Assignment-Operators