一份以代码和注释方式讲解 Python 的免费教程。每个 Python 基础语法和知识点都采用可以运行的代码为例讲解，再配上适当的注释和参考资料，让你快速上手 Python。此项目不仅可以当做学习 Python 的资料，还可以留着做为速查表 ```python """WHILE statement @see: https://docs.python.org/3/tutorial/controlflow.html @see: https://docs.python.org/3/reference/compound_stmts.html#the-while-statement The while loop executes as long as the condition remains true. In Python, like in C, any non-zero integer value is true; zero is false. The condition may also be a string or list value, in fact any sequence; anything with a non-zero length is true, empty sequences are false. The test used in the example is a simple comparison. The standard comparison operators are written the same as in C: < (less than), > (greater than), == (equal to), <= (less than or equal to), >= (greater than or equal to) and != (not equal to). """ def test_while_statement(): """WHILE statement""" # Let's raise the number to certain power using while loop. number = 2 power = 5 result = 1 while power > 0: result *= number power -= 1 # 2^5 = 32 assert result == 32 ```