Traceback (most recent call last):
File "G:/test.py", line 56, in <module>
heartdis_flt.append(float(item))
TypeError: float() argument must be a string or a number, not 'list'

heartdis = heartdis[5:]

heartdis_flt = []

for item in heartdis:

    heartdis_flt.append(float(item))

print(heartdis_flt)