(The detailed operation of the read and write files) 2 python- file operation

(The detailed operation of the read and write files) 2 python- file operation

1, the first six rows to read the file

f = open ("my-hert2","r")  #encoding="utf-8"
print(f.readline())
print(f.readline())
print(f.readline())
print(f.readline())
print(f.readline())
print(f.readline())

Another way:

f = open ("my-hert2","r")  #encoding="utf-8"
for i in range(6):
print(f.readline())

Print results are as follows -----

Far East a dragon,

Its name is China

Far East there is a group of people,

They are all Chinese people

There are ancient oriental river

It's called the Yellow River

 

2, print all the contents of the file, but does not print ten lines

The first written

Open = f ( " My-Heart " , " r " )
 for index, Line in the enumerate (f.readlines ()): # can read small files, large files will slow if the
     IF   index == 9 :
         Print ( " - ----- parting line " )
         Continue 
    Print (line.strip ()) 
COUNT = 0

The second cycle of writing efficient

= COUNT 0 
F = Open ( " My-Heart " , " R & lt " )
 for Line in F:
     IF COUNT ==. 9 :
         Print ( ' ----- parting line ---- ' ) 
        COUNT + =. 1
         Continue 
    Print (line.strip ()) # cancellation blank lines, and spaces 
    count + = 1

 Open the file position of the cursor

Open = F ( ' My-Heart ' , ' R & lt ' )
 Print (f.tell ())     # returns the position of the cursor 
Print (reached, f.read (. 5))    # default all read, read-only part of the can, 
Print ( f.tell ())

 ---------------- 
print result 
0 
Every
 . 5