The Magic Boolean variable in Python

In Python, a variable is not just a Boolean value of a variable, but a true one that satisfies any of the following conditions: The variable exists, is not NULL, is not a Boolean false. Conversely, when the value of a variable is false

In Python and Django template systems, the following objects are equivalent to False Boolean values, empty tuples, empty dictionaries, empty lists, empty strings, 0 values, special objects None, Object false.

Here's a simple example to look at a simple definition of a Boolean attribute in Python

Examples of:

The first line is very easy, is to judge 1==1 this expression is set up, the second line we have a Boolean value of true a value, and finally to this judgment, so there is a conclusion as above. In other words, you can arbitrarily modify the Boolean properties in Python.