pythonpython-3.xmathpython-3.7
Cube root in python different in shell
I noticed that when I run this program:
from random import *
z=random()*-1
print(z)
print(z**(1/3))
It returns a complex value. For example, one time its output was
-0.08310434620988971
(0.21819489400101133+0.37792464236185713j)
However, if I run the equivalent command in the shell, it returns the correct answer:
I have repeated this experiment several times, with the same result. Does anybody know why this is?
Solution
Exponentiation has a higher precedence to sign. While -0.08310434620988971**(1/3) is actually
-(0.08310434620988971**(1/3))
z**(1/3) calculates
(-0.08310434620988971)**(1/3)
In the second example z is already a negative number, so the result in that context is correct.
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