Python | shutil.copyfileobj() method

Shutil module in Python provides many functions of high-level operations on files and collections of files. It comes under Python’s standard utility modules. This module helps in automating process of chowning and removal of files and directories.
shutil.copyfileobj() method in Python is used to copy the contents of a file-like object to another file-like object. By default this method copy data in chunks and if want we can also specify the buffer size through length parameter. 
This method copies the content of the file from the current file position to the end of the file.
 

Syntax: shutil.copyfileobj(fsrc, fdst[, length])
Parameters: 
fsrc: A file-like object representing the source file to be copied 
fdst: A file-like object representing the destination file, where fsrc will be copied. 
length (optional): An integer value denoting buffer size. 
File-like object are mainly StringIO objects, connected sockets and actual file objects. 
Return Type: This method does not return any value. 
 

Code: Use of shutil.copyfileobj() method to copy the contents of source file-like object to destination file-like object 
 

# Python program to explain shutil.copyfileobj() method 
  
# importing shutil module 
import shutil

# Source file
source = 'file.txt'

# Open the source file
# in read mode and
# get the file object
fsrc = open(source, 'r') 


# destination file
dest = 'file_copy.txt'

# Open the destination file
# in write mode and
# get the file object
fdst = open(dest, 'w')


# Now, copy the contents of
# file object f1 to f2 
# using shutil.copyfileobj() method
shutil.copyfileobj(fsrc, fdst)

# We can also specify
# the buffer size by passing
# optional length parameter
# like shutil.copyfileobj(fsrc, fdst, 1024)
  
print("Contents of file object copied successfully")

# Close file objects
f1.close()
f2.close()

Contents of file object copied successfully

Reference: https://docs.python.org/3/library/shutil.html