Python3基础 str format 四舍六入五凑偶 保留一位小数

Posted 2021-01-08 xingchuxin

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•                    python : 3.7.0
•                           OS : Ubuntu 18.04.1 LTS
  
•                          IDE : PyCharm 2018.2.4
•                      conda : 4.5.11
•            type setting : Markdown

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code

[email protected]:~$ source activate py37
(py37) [email protected]:~$ ipython
Python 3.7.0 (default, Jun 28 2018, 13:15:42) 
Type ‘copyright‘, ‘credits‘ or ‘license‘ for more information
IPython 6.5.0 -- An enhanced Interactive Python. Type ‘?‘ for help.

In [1]: # 四舍

In [2]: "{0:.1f}".format(27.54)
Out[2]: ‘27.5‘

In [3]: "{0:.1f}".format(27.64)
Out[3]: ‘27.6‘

In [4]: 

In [4]: # 六入

In [5]: "{0:.1f}".format(27.56)
Out[5]: ‘27.6‘

In [6]: "{0:.1f}".format(27.66)
Out[6]: ‘27.7‘

In [7]: 

In [7]: # 五凑偶

In [8]: "{0:.1f}".format(27.55)
Out[8]: ‘27.6‘

In [9]: "{0:.1f}".format(27.65)
Out[9]: ‘27.6‘

In [10]: exit
(py37) [email protected]:~$ source deactivate py37
[email protected]:~$ 

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resource

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