complex(real=0, imag=0)

complex(string)

Returns a complex number with the value real + imag * 1j or converts a string to a complex number if the first argument is a string. The second argument is optional and defaults to 0. If both arguments are omitted, it returns 0j.

Parameters¶

complex() accepts two parameters:

• real - the real part. If omitted, it defaults to 0.
• imag - the imaginary part. If not specified, it defaults to 0.

If the first parameter is a string, it will be interpreted as a complex number. In this case, do not provide the second parameter.

Return Value¶

• The complex() function returns a complex number.
• If the string passed to this function is not a valid complex number, a ValueError is raised.

Examples¶

complex(1)  # (1+0j)
complex(1, 2)  # (1+2j)
complex("1.5+1j")  # (1.5+1j)
complex("1.5+2j")  # (1.5+2j)