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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def guard_activate(analysis_service):
 """Returns whether the transition activate can be performed for the analysis service passed in """

    calculation = analysis_service.getCalculation()
    if not calculation:
        return True

    # If the calculation is inactive, we cannot activate the service
    if not api.is_active(calculation):
        return False

    # All services that we depend on to calculate our result are active or we
    # don't depend on other services.
    dependencies = calculation.getDependentServices()
    for dependency in dependencies:
        if not api.is_active(dependency):
            return False

    return True