How to Copy File Contents in Python

import shutil

shutil.copyfile("source.txt", "destination.txt")

shutil.copy2("source.txt", "backup.txt")

print("File copied successfully")

import shutil
import os

source = "document.txt"

shutil.copyfile(source, "copy1.txt")

shutil.copy(source, "./backups/")  # Creates backups/document.txt

shutil.copy2(source, "copy2.txt")

original_stat = os.stat(source)
copy2_stat = os.stat("copy2.txt")

print(f"Original modified time: {original_stat.st_mtime}")
print(f"copy2 modified time:    {copy2_stat.st_mtime}")  # Same

source = "large_video.mp4"
destination = "copy.mp4"

buffer_size = 1024 * 1024

with open(source, 'rb') as f_in, open(destination, 'wb') as f_out:
    while chunk := f_in.read(buffer_size):
        f_out.write(chunk)

print("Large file copied successfully")

import os

def copy_with_progress(source: str, destination: str, buffer_size: int = 1024 * 1024):
    """Copy file with progress percentage display."""
    file_size = os.path.getsize(source)
    copied = 0
    
    with open(source, 'rb') as f_in, open(destination, 'wb') as f_out:
        while chunk := f_in.read(buffer_size):
            f_out.write(chunk)
            copied += len(chunk)
            progress = (copied / file_size) * 100
            print(f"\rProgress: {progress:.1f}%", end="")
    
    print("\nCopy complete!")

copy_with_progress("large_file.zip", "backup.zip")

import shutil

with open('source.txt', 'rb') as src:
    with open('destination.txt', 'wb') as dst:
        shutil.copyfileobj(src, dst)

import shutil

with open('large_file.bin', 'rb') as src:
    with open('copy.bin', 'wb') as dst:
        shutil.copyfileobj(src, dst, length=65536)

import shutil

with open('log_archive.txt', 'a') as archive:
    with open('today.log', 'r') as today:
        shutil.copyfileobj(today, archive)

print("Log appended to archive")

import shutil
from pathlib import Path

log_files = sorted(Path('./logs').glob('*.log'))

with open('combined.log', 'w') as combined:
    for log_file in log_files:
        combined.write(f"\n=== {log_file.name} ===\n")
        with open(log_file, 'r') as f:
            shutil.copyfileobj(f, combined)

print(f"Combined {len(log_files)} log files")

import shutil
from pathlib import Path

def safe_copy(source: str, destination: str) -> bool:
    """Copy file with comprehensive error handling."""
    source_path = Path(source)
    dest_path = Path(destination)
    
    if not source_path.exists():
        print(f"Error: Source file '{source}' not found")
        return False
    
    dest_path.parent.mkdir(parents=True, exist_ok=True)
    
    try:
        shutil.copy2(source, destination)
        print(f"Copied: {source} -> {destination}")
        return True
    except PermissionError:
        print(f"Error: Permission denied for '{destination}'")
        return False
    except shutil.SameFileError:
        print(f"Error: Source and destination are the same file")
        return False
    except OSError as e:
        print(f"Error: {e}")
        return False

safe_copy("data.txt", "./backup/data.txt")

def copy_with_encoding(source: str, destination: str, 
                       source_encoding: str = 'utf-8',
                       dest_encoding: str = 'utf-8'):
    """Copy text file with encoding conversion."""
    with open(source, 'r', encoding=source_encoding) as f_in:
        content = f_in.read()
    
    with open(destination, 'w', encoding=dest_encoding) as f_out:
        f_out.write(content)

copy_with_encoding('old_file.txt', 'new_file.txt', 
                   source_encoding='latin-1', 
                   dest_encoding='utf-8')

def copy_normalize_newlines(source: str, destination: str):
    """Copy text file, converting all line endings to Unix style."""
    with open(source, 'r', newline=None) as f_in:  # Universal newline mode
        content = f_in.read()
    
    with open(destination, 'w', newline='\n') as f_out:
        f_out.write(content)

copy_normalize_newlines('windows_file.txt', 'unix_file.txt')