- 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
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。