What parameters does float have?

The parameters of float include integers, strings, floating point numbers, scientific notation strings, Boolean values, None, other types, etc. Detailed introduction: 1. Integer, you can directly convert an integer into a floating point number; 2. String, you can convert a string representing a floating point number into a floating point number; 3. Floating point number, if the parameter is already a floating point number, the value will be returned directly ; 4. Scientific notation string, you can convert the string representing scientific notation into a floating point number; 5. Boolean value, you can convert True to 1.0, False to 0.0, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In programming, float is a data type used to represent floating point numbers (that is, decimals). In Python, the float type has the following parameters:

1. Integer: Integers can be converted directly to floating point numbers. For example, float(10) will return 10.0.

2. String: A string representing a floating point number can be converted to a floating point number. For example, float("3.14") will return 3.14. If the string cannot be converted to a floating point number, a ValueError exception is raised.

3. Floating point number: If the parameter is already a floating point number, the float() function will not perform any conversion on it, but will directly return the value. For example, float(3.14) will return 3.14.

4. Scientific notation string: A string representing scientific notation can be converted to a floating point number. For example, float("1.23e-4") will return 0.000123.

5. Boolean value: True can be converted to 1.0 and False can be converted to 0.0.

6. None: Convert None to 0.0.

7. Other types: If the parameter is not one of the above types, a TypeError exception will be raised.

In addition to the above parameter types, the float() function can also accept an additional optional parameter to specify the rounding precision. This parameter is called rounding. By default, the rounding precision is None, which means no rounding is performed, that is, the original floating point number is returned. When the rounding precision is specified, the floating point number will be rounded according to the specified precision and the rounded result will be returned.

For example, float(3.14159, 2) will return 3.14, which rounds the floating point number 3.14159 to 2 decimal places.

It should be noted that the float() function does not perform type checking on parameters. If the argument cannot be converted to a floating point number, an appropriate exception is thrown. Therefore, when using the float() function, you should ensure that the parameter type passed is correct to avoid unnecessary errors.

The above is the detailed content of What parameters does float have?. For more information, please follow other related articles on the PHP Chinese website!