理解Python中raise、assert语句

Simple statements

A simple statement is comprised within a single logical line.

Several simple statements may occur on a single line separated by semicolons.

The syntax for simple statements is :

simple_stmt ::= expression_stmt | assert_stmt | assignment_stmt | augmented_assignment_stmt | annotated_assignment_stmt | pass_stmt | del_stmt | return_stmt | yield_stmt | raise_stmt | break_stmt | continue_stmt | import_stmt | future_stmt | global_stmt | nonlocal_stmt

7.1 Expression statements

7.2 Assignment statements

Assignment statements are used to (re)bind names to values to modify attributes or items of mutable objects.

7.3 The assert statement

Assert statements are a convenient way to insert debugging assertions into a program.

7.4 The pass statement

pass is a null operation , which means when it is executed, nothing happens.

7.5 The del statement

7.6 The return statement

7.7 The yield statement

7.8 The raise statement

If no expressions are present, raise re-raise the last exception that was active in the current scope. If no exception is active in the current scope, a RuntimeError exception is raised indicating that this is an error.

From tutorial, definition of raise is :

The raise keyword is used to raise an exception. You can define what kind od error to raise, and the text to

7.9 The break statement

7.10 The continue statement

7.11 The import statement

7.12 The global statement

7.13 The nonlocal statement

References

Python Tutorial