Python os.read()用法及代碼示例

Python中的OS模塊提供了與操作係統進行交互的函數。操作係統屬於Python的標準實用程序模塊。該模塊提供了使用依賴於操作係統的函數的便攜式方法。

os.read()Python中的方法用於從與給定文件描述符關聯的文件中讀取最多n個字節。

如果在從給定文件描述符讀取字節時到達文件末尾，os.read()方法將為所有要讀取的剩餘字節返回一個空字節對象。

文件描述符是一個小整數值，對應於當前進程已打開的文件。它用於執行各種較低級別的I /O操作，例如讀取，寫入，發送等。

注意：os.read()方法旨在用於低級操作，並且應應用於由返回的文件描述符os.open()或者os.pipe()方法。

用法： os.read(fd, n) 

將以下文本視為名為Python_intro.txt的文件的內容。

Python is a widely used general-purpose, high level programming language. It was initially designed by Guido van Rossum in 1991 and developed by Python Software Foundation. It was mainly developed for emphasis on code readability, and its syntax allows programmers to express concepts in fewer lines of code. Python is a programming language that lets you work quickly and integrate systems more efficiently.

# Python program to explain os.read() method  
    
# importing os module  
import os 
  
# File path  
path = "/home / ihritik / Documents / Python_intro.txt"
  
  
# Open the file and get 
# the file descriptor associated 
# with it using os.open() method 
fd = os.open(path, os.O_RDONLY) 
  
  
# Number of bytes to be read 
n = 50
  
# Read at most n bytes  
# from file descriptor fd 
# using os.read() method 
readBytes = os.read(fd, n) 
  
# Print the bytes read 
print(readBytes) 
  
# close the file descriptor 
os.close(fd)

b'Python is a widely used general-purpose, high leve'