•        Python : 3.7.3
•          OS : Ubuntu 18.04.2 LTS
•         IDE : pycharm-community-2019.1.3
•       Conda : 4.7.5
•    typesetting : Markdown

 

code

"""

@Author : 行初心

@Date   : 2019/7/7

@Blog   : www.cnblogs.com/xingchuxin

@Gitee  : gitee.com/zhichengjiu

"""

def main():

    # eval会把字符串的内容 当做 有效的表达式

    # 信息安全 -> eval不要直接执行用户的输入内容

    # 字符串的格式得对

    # txt文本存储 数据信息 -> 读取 转换 应用

    # str -> list

    print(eval("['地浆','阿井泉','盐胆水']"), type(eval("['地浆','阿井泉','盐胆水']")))

    # str -> tuple

    print(eval("(1,2,3,4)"), type(eval("(1,2,3,4)")))

    # str -> dict

    print(eval("{'子':'鼠','丑':'牛','寅':'虎'}"), type(eval("{'子':'鼠','丑':'牛','寅':'虎'}")))

if __name__ == '__main__':

    main()

 

result

/home/coder/anaconda3/envs/py37/bin/python /home/coder/PycharmProjects/Base/demo.py

['地浆', '阿井泉', '盐胆水'] <class 'list'>

(1, 2, 3, 4) <class 'tuple'>

{'子': '鼠', '丑': '牛', '寅': '虎'} <class 'dict'>

Process finished with exit code 0

 

source_code

def eval(*args, **kwargs): # real signature unknown

    """

    Evaluate the given source in the context of globals and locals.

    The source may be a string representing a Python expression

    or a code object as returned by compile().

    The globals must be a dictionary and locals can be any mapping,

    defaulting to the current globals and locals.

    If only globals is given, locals defaults to it.

    """

    pass

 

resource

• [文档 - English] docs.python.org/3
• [文档 - 中文] docs.python.org/zh-cn/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。