python file operation example

#date = open('yesterday',encoding='utf-8').read() 
''' 
f = open('yesterday','a+',encoding='utf-8') #File handle (file memory object): w write mode, r read mode, a append, r+ read and write 
f = open('yesterday','r+',encoding='utf-8') 
f = open('yesterday','w+',encoding ='utf-8') 
f = open('yesterday','rb')#file handle, binary file network transmission, read binary file 
f = open('yesterday','wb')#write as binary file# 
data = f.read() 
#print(data) 
f.write('\nI love Beijing Tiananmen...\n') 
f.write('The sun rises on Tiananmen') 
data = f.read() 
print(data ) 
f.close() 
''' 
'''' 
f = open('yesterday','r+',encoding='utf-8')
print(f.readline())
print(f.readline())
print(f.readline())
print(f.tell())
f.write('-------------------------------------------- ----') 

print(f.readline()) 
f.close() 
''' 
f = open('yesterday','rb') 
#f.write("hello binary\n".encode()) 
print(f.readline()) 
f.close() 


''' 
print(f.tell()) #Print the current position 
print(f.readline()) 
print(f.readline()) 
print(f.readline ()) 
print(f.tell()) 
f.seek(10) #return place 
print(f.readline()) 
print(f.encoding) #return encoding format 
print (f.fileno()) #file Handle number 
print(f.seekable())#Determine whether the cursor can be moved 
print(f.readable())#Whether the file is readable 
print(f.writable())#Determine whether the file can be written 
''' 

''' 
f .write('hello 1\n') 
print(f.buffer) 
print(f.flush()) #flush to hard disk
f.seek(10) 
f.truncate(20)#If you don't write it, you will clear it, and truncate 
''' from the beginning 

#for i in range(5): 
# print(f.readline()) 
#print(f.readline() ) 
#for line in f.readline(): 
#print(f.readlines()) 
#low 
''' 
for index,line in enumerate(f.readlines()):#f.readlines() is suitable for small files 
    if index ==9: 
        print('-----------I am the 9th line------------') 
        continue 
    print(line.strip()) 
''' 
#high bige read line by line, and only keep the same memory 
'''' 
count = 0 
for line in f: 
    if count ==9: 
        print('-------------I am the 9th line- ------------') 
        count += 1 
        continue 
    print(line.strip())
    count +=1
'''