python interview - override & overload

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2018-09-29

Python interview - override & overload

将一个Python数据结构转换为JSON dumps

将一个JSON编码的字符串转换回一个Python数据结构. loads

import json 

if __name__ == '__main__':
    
    with open('bonds.json', encoding='utf-8') as f:
        data = json.load(f)
        with open('bonds.json', 'w') as s:
            data_json = json.dump(data, s, ensure_ascii=False, indent=2)

decode json unicode python 搜索关键词

Handling Unicode Strings in Python

Python-cookbook

错误关键词定义：json load unicodedecodeError ascii

解答链接：json.load() function give strange ‘UnicodeDecodeError: ‘ascii’ codec can’t decode’ error

with open('bonds.json', encoding='utf-8') as f:
    data = json.load(f)
    with open('bonds.json', 'w') as s:
        data_json = json.dump(data, s, ensure_ascii=False, indent=2)





import json
import os

from django.core.management.base import BaseCommand
from django.conf import settings


# from config.settings.base import BASE_DIR

class Command(BaseCommand):

    def add_arguments(self, parser):
        parser.add_argument('app_name', help="需要更新数据的app的名称")

    def handle(self, *args, **kwargs):
        file_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "../../../"))
        app_name = kwargs['app_name']
        fixture_path = file_path + "{app_name}/fixtures/{app_name}.json".format(app_name=app_name, file_name=app_name)

        with open(fixture_path, encoding='utf-8') as f:
            data = json.load(f)
            data_jsons = json.dumps(data, ensure_ascii=False, indent=2)
            with open(fixture_path, 'w', encoding='utf-8') as s:
                for data_json in data_jsons:
                    s.write(data_json)

os.path 使用

问题定义： python file path Parent

How to Create Custom Django Management Commands

https://simpleisbetterthancomplex.com/tutorial/2018/08/27/how-to-create-custom-django-management-commands.html

How to get the parent dir location

Get parent of current directory from Python script

os.path.join 将多个路径组合后返回，第一个绝对路径之前的参数将被忽略

os.path.dirname 返回path的目录。其实就是os.path.split(path)的第一个元素

path = os.path.join(os.path.dirname(__file__), os.path.join('templates', 'blog1/page.html'))


aParent
   |--a
   |  |---b.py
   |      |---templates
   |              |--------blog1
   |                         |-------page.html
   |--templates
          |--------blog1
                     |-------page.html

how to get the aParent location:

dirname = os.path.dirname 
path = os.path.join(dirname(dirname(__file__)), os.path.join('templated', 'blog1/page.html'))

or

path = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))

import os
current_dir =  os.path.abspath(os.path.dirname(__file__))
parent_dir = os.path.abspath(current_dir + "/../")

path = os.path.abspath(os.path.join(os.path.dirname(os.path.abspath(__file__)),"..",".."))

pycharm 查看todo

views --> Tool Windows: commands + 6

https://docs.djangoproject.com/en/2.1/howto/custom-management-commands/#command-objects

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