Time module and OS module, JSON module

Import time# def month (n): # time.local () # struct_time=time.strptime ("%y-%m-1", "%y-%m-%d") # print (struct_time) # Return Time.mktime (struct_time) # # Print (month (2)) # Ret=time.localtime (1500000000) # print (ret) # Print (Time.strftime ( "%Y", ret) # print (struct_time) # ret=time.localtime () # Print (ret) # Print (Time.strftime ("%Y")) # time module: # Print (time.        Time ()) #时间戳 # timestamp Time, GMT, float data type for machine # London, England 1970.1.1 0:0:0 # beijing time 1970.1.1 8:0:0 # 1533693120.3467407     #时间元祖 # ret=time.localtime () # Print (ret) #格式化时间: # Print (Time.strftime ("%y-%m-%d")) #他们之间的转换关系: #     Timestamp converted to structured time in converted to formatted time # ret=time.localtime (1500000000) # print (ret) # Print (Time.strftime ("%y-%m-%d", ret) # Format time converted to timestamp # struct_time=time.strptime ("2018-8-8", "%y-%m-%d") # Print (Time.mktime (struct_time)) # SYS module Import SYS #    Deal with Python interpreter # Sys.path #查看文件路径 # sys.modules #查看模块路径 # Print (sys.platform) #查看系统 # sys.exit () # End Program #os module import OS #os. Module # os.makedirs (' Dir/dir1 ') #生成文件多层目录 # OS.mkdir (' Dir2 ') #创建同级文件 # os.removedirs (' Dir/dir1 ') #删除多级文件, must require that the file is empty, encountered non-empty file will not delete # Os.rmdir (' Dir2 ') #删除单级文件, non-empty files are not deleted, error # ret=os.listdir (' E:\python:project ') #查看该路径下文件, print in list form # print (ret) # Os.system ("02.py") for copy and delete files # Ret=os.popen (" 02.py ") #用于查看某些信息, perform certain operations # print (Ret.read ()) # Os.path Module # print (Os.path.dirname (' e:\python:project\day27\01.py ')) # Returns the __file__ # print (Os.path.isfile (' 01.py ')) #判断是否文件, using the absolute path # print (Os.path.isfile (' e:\python:project\ Day27 ') # Print (Os.path.isdir (' 01.py ')) #判断是否是一个文件夹, with the absolute path # print (Os.path.isdir (' e:\python:project\day27 ')) # ret = Os.path.join (' e:\python:project\day27 ', ' aaa ', ' BBB ') #将多个路径组合后拼接 # Print (Os.path.abspath (ret)) # Ret=os.path.getsize (R ' E:\python:project ') #统计文件夹中所有的总size # print (ret) # Serialization module Import json# can match four usages of other languages # JSON: # dic={"A": 1, "B": 2, "C": 3}# Str_dic=json.dumps (DIC) #json. Dumps can convert some of the other types to string type # print (str_dic) # dic1=json.loads (str_dic) # Json.loads can revert the string type to the original type # print (DIC1) # with open ("file.txt", mode= "W", encoding= "Utf-8") as F: #将部分其他类型的转换为字符串写入文件 #    Json.dump (dic,f) # with open ("file.txt", mode= "R", encoding= "Utf-8") as F: #将转换的类型还原并且读出 # Print (Json.load (f)) 

Time module and OS module, JSON module