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This seems to output an AttributeError, namely 'sage.rings.real_mpfr.RealLiteral' object has no attribute 'real_part'. Also note that there are some real numbers in the list.

A way to work around this is to convert each element x to a complex number via CC(x), see updated for loop below.

for el in [CC(x) for x in allRootsAPow2]:
    if (math.ceil(el.real_part()*10)/10)== 2 and (math.ceil(el.imag_part()*10)/10)== 3  :
        show(el)

One other option is to define a number to which you cant to compare ($2+3i$ in your example) and a tolerance (0 from above) and use the modulus of the difference as a metric (here the conversion to CC seems to be implicit through the subtraction from other).

other = CC(2+3*i)
tolerance = 0.001
print [x for x in allRootsAPow2 if abs(other-x)<=tolerance]

This seems to output an AttributeError, namely 'sage.rings.real_mpfr.RealLiteral' object has no attribute 'real_part'. Also note that there are some real numbers in the list.

A way to work around this is to convert each element x to a complex number via CC(x), see updated for for loop below.

for el in [CC(x) for x in allRootsAPow2]:
    if (math.ceil(el.real_part()*10)/10)== 2 and (math.ceil(el.imag_part()*10)/10)== 3  :
        show(el)

One other option is to define a number to which you cant want to compare to ($2+3i$ in your example) and a tolerance (0 from above) and use the modulus of the difference as a metric (here the conversion to CC seems to be implicit through the subtraction from other).

other = CC(2+3*i)
tolerance = 0.001
print [x for x in allRootsAPow2 if abs(other-x)<=tolerance]