Python3基础 assert 断言 确保程序的正确运行条件

 

•        Python : 3.7.0
•          OS : Ubuntu 18.04.1 LTS
•         IDE : PyCharm 2018.2.4
•       Conda : 4.5.11
•    typesetting : Markdown

 

code

"""
@Author : 行初心
@Date   : 18-9-24
@Blog   : www.cnblogs.com/xingchuxin
"""


def main():
    data = int(input('输入一个整数:'))

    assert data >= 0  # 当data小于0时，触发此异常

    if 90 <= data <= 100:
        print(str(data) + '在90到100之间')
    elif 80 <= data <= 90:
        print(str(data) + '在80到90之间')
    else:
        print(str(data) + '小于80')


if __name__ == '__main__':
    main()

 

result

/home/coder/anaconda3/envs/py37/bin/python /home/coder/PycharmProjects/basic/demo.py
输入一个整数:-1
Traceback (most recent call last):
  File "/home/coder/PycharmProjects/basic/demo.py", line 23, in <module>
    main()
  File "/home/coder/PycharmProjects/basic/demo.py", line 12, in main
    assert data >= 0  # 当data小于0时，触发此异常
AssertionError

Process finished with exit code 1

/home/coder/anaconda3/envs/py37/bin/python /home/coder/PycharmProjects/basic/demo.py
输入一个整数:5
5小于80

Process finished with exit code 0

 

resource

• [文档] docs.python.org/3
• [规范] www.python.org/dev/peps/pep-0008
• [规范] zh-google-styleguide.readthedocs.io/en/latest/google-python-styleguide/python_language_rules
• [源码] www.python.org/downloads/source
• [ PEP ] www.python.org/dev/peps
• [平台] www.cnblogs.com
• [平台] gitee.com

 

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Python具有开源、跨平台、解释型、交互式等特性，值得学习。
Python的设计哲学：优雅，明确，简单。提倡用一种方法，最好是只有一种方法来做一件事。
代码的书写要遵守规范，这样有助于沟通和理解。
每种语言都有独特的思想，初学者需要转变思维、踏实践行、坚持积累。