complex
complex([real[, imag]])
Creates a complex number with the value real + imag*j or convert a
string or number to a complex number. If the first parameter is a
string, it will be interpreted as a complex number and the function
must be called without a second parameter. The second parameter can
never be a string. Each argument may be any numeric type (including
complex). If the second parameter is omitted, it defaults to zero and
the function serves as a numeric conversion function like int,
long andfloat. If both parameters are omitted, returns 0j.
