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My Goal：Checking whether the voltage within the range of 0.9 to 1.05

**My_Code_1：**

ierr, volts = psspy.abusreal(1,1,string='PU')

x1.set_cell ((3, 'z'),'pass' if (0.9 < max(zip(*volts )) < 1.05  and  0.9 < min(zip(*volts ))

             < 1.05) else 'Not Pass')*


**My_Code_1_Result：**  

'Not Pass'

**My_Code_2：**

ierr, volts = psspy.abusreal(1,1,string='PU')

max_value = max(zip(*volts ))

min_value = min(zip(*volts ))

x1.set_cell ((3, 'z'),'pass' if (0.9 < max_value  < 1.05  and  0.9 < min_value< 1.05) else 

             'Not Pass')*


**My_Code_2_Result：**  

'Not Pass'

**My_Code_3：**

tolerance = 1e-6 

ierr, volts = psspy.abusreal(1,1,string='PU')

x1.set_cell ((3, 'z'),'pass' if (0.9+tolerance < max(zip(*volts )) < 1.05-tolerance and 0.9+tolerance < min(zip(*volts)<1.05-tolerance) else 'Not Pass')*


**My_Code_3_Result：**  

'Not Pass'

I checked all the value of max(zip(volts )) and min(zip(volts )).

They are all within 0.9~1.05. But why keep jumping into else shows 'Not Pass' ?

I did it wrong or can't do like this ?

Thank you for reading my question.