Python Mixed Mode operator

We know that the plus sign (+) can be used to do addition operations, but not only for addition operations, because the number has integer, Long integer, floating point type and so on, these are not directly added, you must first convert to the same type to add, and as two strings added, not to represent the addition operation, but to connect two strings together, Generates a new string.

The principle of numeric type conversions:

(1) If one operand is a complex number, the other operand is converted to a plural
(2) If one of the operands is floating point, the other operand is converted to float, such as 1 + 4.5 result is 5.5
(3) If one of the operands is a long integer, the other operand is converted to a long integer type
(4) If two operands are integral type, no conversion is required

Python Mixed Mode operator