Python学习之问题记录

Posted by 2018年9月7日 in 其他杂记

一、__init__.py的作用

当需要加载自定义的目录下所有文件时，让该目录识别为package，则目录下需要有__init__.py 文件，另外在模糊加载时，也需要定义 例如： __all__ = [“Pack1Class”,”Pack1Class1″]， 总结如下：

Python中package的标识，不能删除

定义__all__用来模糊导入

编写Python代码(不建议在__init__中写python模块，可以在包中在创建另外的模块来写，尽量保证__init__.py简单）

二、python中时间差中seconds和total_seconds

在python中经常会用到计算两个时间差，两个日期类型进行相减可以获取到时间差

经常会使用seconds来获取，其实seconds获取的是时间差的秒数，遗漏了天

seconds是获取时间部分的差值，而total_seconds()是获取两个时间之间的总差

import datetime

t1 = datetime.datetime.strptime("2016-08-24 10:30:00", "%Y-%m-%d %H:%M:%S")
t2 = datetime.datetime.strptime("2016-08-24 12:30:00", "%Y-%m-%d %H:%M:%S")

interval_time = (t2 - t1).seconds  # 输入的结果：7200
total_interval_time = (t2 - t1).total_seconds() # 输出结果也是: 7200

# 换一个方式
t1 = datetime.datetime.strptime("2016-08-24 10:30:00", "%Y-%m-%d %H:%M:%S")
t2 = datetime.datetime.strptime("2016-08-27 12:30:00", "%Y-%m-%d %H:%M:%S")

interval_time = (t2 – t1).seconds # 输入的结果：7200 total_interval_time = (t2 – t1).total_seconds() # 输出结果也是: 266400

三、 遍历数组获取索引下标

for i, one_js in enumerate(js_actions):

四、Python出现’ascii’ codec can’t encode characters…的解决方法

第一步，别忘了给顶行加上：
# -*- coding: utf-8 -*-
第二步，重新载入SYS模块并设置uft-8

         import sys
         reload(sys)
         sys.setdefaultencoding(‘utf-8’)

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