Python--use of negative square root-imaginary

The square root of a negative number is an imaginary number.

SQRT cannot be used because it can only handle floating-point numbers, and the imaginary numbers are completely different-that is why these functions are implemented by another module called Cmath (that is, complex math, complex number).

Import cmath>>> cmath.sqrt ( -1)1j

Note that this does not use the From ... import ... Statement, because once this statement is used, the normal sqrt function cannot be used.

Therefore, unless you really need a module import statement from this form, you should stick with normal import.

Python--use of negative square root-imaginary