Python学习手记

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>>> print(*[1], *[2], 3)
1 2 3
>>> dict(**{'x': 1}, y=2, **{'z': 3})
{'x': 1, 'y': 2, 'z': 3}
>>> {'x': 1, **{'x': 2}}
{'x': 2}
>>> {**{'x': 2}, 'x': 1}
{'x': 1}

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>>> print('你好')
你好
>>> print(u'你好')
你好

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>>> print('\n \t sss')

 	 sss
>>> print(r'\n \t sss')
\n \t sss

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'内容'.encode('utf-8')
>>>b'\xe5\x86\x85\xe5\xae\xb9'

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>>> word='before' if 1>2 else 'after'
>>> print(word)
after

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# 首先生成一个列表
>>> container=list(range(1,11))
>>> print(container)
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# 传统思路是对列表进行循环
>>> empty=[]
>>> for x in container:
...     empty.append(x-1)
...     
>>> empty
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

# 使用列表生成式，对每个元素直接处理
>>> [x-1 for x in container]
>>> [x-1 for x in range(1,11)]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
# 后面还可以对元素进行条件判断，比如3的倍数才进行处理
>>> [x-1 for x in container if x%3==0]
[2, 5, 8]
# 还可以对多个`iterable`进行操作，如下可以生成两个集合的笛卡尔积
>>> [x+y for x in '123' for y in 'abc']
['1a', '1b', '1c', '2a', '2b', '2c', '3a', '3b', '3c']
# 同理可以将`dict`一次转为`list`
>>> dictVar={'1':'a','2':'b'}
>>> print(dictVar)
{'1': 'a', '2': 'b'}
>>> listVar=[k+'->'+v for k,v in dictVar.items()]
>>> listVar
['1->a', '2->b']

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# 还是以上述列表生成式中的需求为例，借助`map`处理每个元素
>>> list(map(lambda x:x-1, container))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
# 等同于
>>> list(x-1 for x in container)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> [x-1 for x in container]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

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import SimpleHTTPServer
import SocketServer

PORT = 8000

Handler = SimpleHTTPServer.SimpleHTTPRequestHandler

httpd = SocketServer.TCPServer(("", PORT), Handler)

print "serving at port", PORT
httpd.serve_forever()

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python -m SimpleHTTPServer 8000
# python3
python3 -m http.server 8000

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#!/usr/bin/python3
import json
 
# Python 字典类型转换为 JSON 对象
data = {
  "header": {
    "code": "200",
    "desc": "success"
  },
  "body": {
    "total": 489,
    "pageIndex": 3,
    "msg": "success",
    "pageSize": 200,
    "dataList": [
      {
          "key":666,
          "other":888
      },
      {
          "key":666,
          "other":888
      },
      {
          "key":666,
          "other":888
      },
      {
          "other":888
      },
      {
          "key":None,
          "other":888
      }
    ]
  }
}
json_str = json.dumps(data)
# print ("Python 原始数据：", repr(data))
# print ("JSON 对象：", json_str)

# print(data['body']['dataList'])
# 这里我们检查上述json结构dataList的每一项，查看不存在 "key"的dict项，或者值空的数据
[print(dataItem) for dataItem in data['body']['dataList'] if ("key" not in dataItem.keys() or dataItem["key"]==None)]

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#!/usr/bin/python3
# -*- coding:UTF-8 -*-
###############################################################################
# pip install qrcode
# 命令行二维码工具
#
# :author:: DragonSong 📅: 2022/3/4
#

import qrcode

def printQR(str):
      qr = qrcode.QRCode()
      qr.border = 1
      qr.add_data(str)
      qr.make()
      qr.print_ascii(out=None, tty=False, invert=False)


if __name__ == "__main__":
    str = input("请输入你要encode为二维码的字符:")
    printQR(str)

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with open('/Users/dragonsong/Downloads/code-repo/dragonsong031100/content/posts/methodology/work/make-a-great-meeting/freemind.txt') as fp:
   line = fp.readline()
   while line:
       str_arr = line.split(' ')
       for ele in str_arr:
             if "TEXT" in ele:
                   print(ele.replace("TEXT=","").replace("\"",""));
       line = fp.readline()


#conding=utf8  
import os 

directory = os.walk(r"/Users/dragonsong/Desktop/dir")  

for path,dir_list,file_list in directory:  
    for file_name in file_list:  
        print(file_name)

        suffix = os.path.splitext(file_name)[1]
        if suffix == '.record_dat':
            print(file_name)
            os.rename((path+ os.sep + file_name),(path+ os.sep + file_name+'.mp4'))

# concat 拼接操作
content = []
with open('/Users/dragonsong/Downloads/zeus_2022_2_23.csv', 'r') as f:
    for line in f.readlines():
        line_list = line.strip('\n').split(',')     # 去除换行符，以制表符分隔
        new_c = line_list[2]+'("'+line_list[1]+'","'+line_list[0]+'"),'
        print(new_c)