sys模块 json pickle模块

# sys模块
# import sys
# sys.path
# sys.argv
# sys.exit() # 脚本退出
# print('[%s]'%('#'*1))
# print('[%s]'%('#'*2))
# print('[%s]'%('#'*3))
# print('[%s]'%('#'*4))
# print('[%s]'%('#'*5))
# print('[%-50s]'%('#'*1))
# print('[%-50s]'%('#'*2))
# print('[%-50s]'%('#'*3))
# print('[%-50s]'%('#'*4))
# print('[%-50s]'%('#'*5))
'''
[#]
[##]
[###]
[####]
[#####]
[#                                                 ]
[##                                                ]
[###                                               ]
[####                                              ]
[#####                                             ]
'''
# print('%d%%'%30) # 30%
# print('[%%-%ds]'%50)
# print(('[%%-%ds]'%50)%('#'*1))
# print(('[%%-%ds]'%50)%('#'*2))
# print(('[%%-%ds]'%50)%('#'*3))
# print(('[%%-%ds]'%50)%('#'*4))
# print(('[%%-%ds]'%50)%('#'*5))
'''
[%-50s]
[#                                                 ]
[##                                                ]
[###                                               ]
[####                                              ]
[#####                                             ]
'''
# def progress(percent,width=50):
#     show_str=('[%%-%ds]'%width)%('#'*int(width*percent))
#     print('\r%s'%show_str,end='')

# progress(0.1)
# progress(0.2)
# progress(0.3)
# progress(0.4)
# progress(0.5)
'''
[#####                                             ]
[##########                                        ]
[###############                                   ]
[####################                              ]
[#########################                         ]
'''
# def progress(percent,width=50):
#     show_str=('[%%-%ds]'%width)%('#'*int(width*percent))
#     print('\r%s'%show_str,end='')
# progress(0.1)
# progress(0.2)
# progress(0.3)
# progress(0.4)
# progress(0.5)
'''
[#########################                         ]
'''
# def progress(percent,width=50):
#     show_str=('[%%-%ds]'%width)%('#'*int(width*percent))
#     print('\r%s %d%%'%(show_str,int(100*percent)),end='')
# progress(0.1)
# progress(0.2)
# progress(0.3)
# progress(0.4)
# progress(0.5)
'''
[#########################                         ] 50%
'''
# import time
# def progress(percent,width=50):
#     show_str=('[%%-%ds]'%width)%('#'*int(width*percent))
#     print('\r%s %d%%'%(show_str,int(100*percent)),end='')
# recv_size=0
# total_size=198749
# while recv_size < total_size:
#     time.sleep(0.1)
#     recv_size+=1034
#     progress(recv_size/total_size)
'''
[##################################################] 100%
'''
# import time
# def progress(percent,width=50):
#     show_str=('[%%-%ds]'%width)%('#'*int(width*percent))
#     print('\r%s %d%%'%(show_str,int(100*percent)),end='')
# recv_size=0
# total_size=10241
# while recv_size < total_size:
#     time.sleep(0.1)
#     recv_size+=1024
#     progress(recv_size/total_size)
'''
[######################################################] 109%
'''
# import time
# def progress(percent,width=50):
#     if percent >= 1:
#         percent=1
#     show_str=('[%%-%ds]'%width)%('#'*int(width*percent))
#     print('\r%s %d%%'%(show_str,int(100*percent)),end='')
# recv_size=0
# total_size=10241
# while recv_size < total_size:
#     time.sleep(0.1)
#     recv_size+=1024
#     progress(recv_size/total_size)
'''
[##################################################] 100%
'''
# 序列化可以将内存中的数据结构保存下来，字典 ，列表，元组，字符串...
# dic={'a':1}
# with open('db.txt','w',encoding='utf-8')as f:
#     f.write(str(dic))
# with open('db.txt','r',encoding='utf-8')as f:
#     dic=eval(f.read())
#     print(dic['a'])
'''
1
'''
'''
内存中结构化的数据<->格式json<->字符串<->保存到文件中或基于网络传输
'''
# eval("[null,false,1]")
# [null,false,1]
# import json
# dic={'a':1}
# res=json.dumps(dic)
# print(res,type(res))
'''
{"a": 1} <class 'str'>
'''
# import json
# dic={'a':1}
# res=str(dic)
# print(res,type(res))
'''
{'a': 1} <class 'str'>
'''
# import json
# x=None
# print(json.dumps(x))
'''
null
'''
# import json
# user={'name':'egon','age':18,'nb':True}
# # with open('user.json','w',encoding='utf-8')as f:
# #     f.write(json.dumps(user))
# json.dump(user,open('user_new.json','w',encoding='utf-8'))
# import json,time
# user={'name':'egon','age':18,'nb':True}
# with open('user.json','w',encoding='utf-8')as f:
#     f.write(json.dumps(user))
# students=['egon','wer','axjl']
# json.dump(students,open('students.json','w',encoding='utf-8'))
# time.sleep(500)
'''
别的文件拿过来的
import json
with open('user.json','r',encoding='utf-8')as f:
    user=json.loads(f.read())
    print(user['name']) # egon

user=json.load(open('user.json','r',encoding='utf-8'))
print(user['age']) # 18
print(user['nb']) # True
'''
# json_str='{"count":1}'
# print(json.loads(json_str))
# print(json.loads(json_str)['count'])
'''
{'count': 1}
1
'''
# pickle
# 可以识别python的所有数据类型
# 但是不能跨平台
# import pickle,json
# s={1,2,3,4}
# # print(json.dumps(s))
# print(pickle.dumps(s))
'''
b'\x80\x03cbuiltins\nset\nq\x00]q\x01(K\x01K\x02K\x03K\x04e\x85q\x02Rq\x03.'
'''
# with open('s.pkl','wb')as f:
#     f.write(pickle.dumps(s))

# pickle.dump(s, open('s.pkl','wb'))
'''
import pickle

with open('s.pkl','rb')as f:
    s=pickle.loads(f.read())
    print(s,type(s))

{1, 2, 3, 4} <class 'set'>
'''
'''
import pickle
s=pickle.load(open('s.pkl','rb'))
print(s,type(s))
{1, 2, 3, 4} <class 'set'>
'''