Python-floating point number integer

There are several methods with different effects.

1. Type factory function, INT (), effect: the floating point number is rounded up, for example, INT (3.5), 3 is returned; the Character Form of a number is converted to a number, such as int ("35 ") returns 35
2. The round () of the built-in function is rounded to the fifth place. The second parameter indicates the number of digits after the decimal point. The default value is 0. For example, if round (3.5) returns 4.0, round (3.5, 1) 3.5 is returned and cannot be rounded up... Bytes
3. The floor () of the math module is an integer smaller than or equal to. For example, floor (3.5) returns 3.0, floor (-1.5) returns-2.0, and cannot be rounded up... Retry

Corresponding to method 1 is the floating point type factory function, float (), for example, float (3) returns 3.0, float ("3.5") returns 3.5