[Python] How to stop converting into complex

End of this calculation the result automatically turns into complex type in Python 3.

$ cat test.py
#!/usr/bin/python
curryield =-100.0
frequency = 2
coupons = 4
days_to_next = -4.0
days_period = 180.0

part1 = (100.0/((1+curryield/frequency)**(coupons-1+(days_to_next/days_period))))
print("Part 1:{} type:{}".format(part1,type(part1)))


I want to keep part1 as float and stop converting into complex type

When I try this to convert it back to float like this

part2 = float(part1)
print("Part 2:{} type:{}".format(part2,type(part2)))


but it throws an exception

Traceback (most recent call last): File "./test.py", line 12, in <module>
part2 = float(part1) TypeError: can't convert complex to float


I know I can convert only the real part part1.real or imaginary part part1.imag to float but I lose the precision. I want to keep the part1 as float after end of the above calculation.

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