File文件操作

File文件操作.py

# -*- coding:utf-8 -*-
#..........file..............
#open(filename,mode),mode is optional,and return a file object 
f = open('/xx/xx/file','r/w/r+/a')

f.read(size)
f.read(line)
f.read(lines)
for line in f:                          #all-list the file content
    print(line,end=' ')
value = ('answer',100)

s = str(value)  #to translate to string 
f.write(s)    #f.write(string)，and return a lenth
#f.seek(offset,from_what),from_what=0,1,2,and 0 is begining,1 is current,2 is end,and the file must be b-bite,or from_what=0
f.seek(-3,2)

#pickle is a module,meaning packing any type data
pickle.dump(x,f)#pickle object x to file f,to translate to string
x = pickle.load(f)#to unpickle object x from f

f.close()   #to close the opened file,and release the memery