Python| os.open() 方法

Python中的OS 模块提供了与操作系统交互的功能。操作系统属于 Python 的标准实用程序模块。该模块提供了一种使用操作系统相关功能的可移植方式。

Python中的os.open()方法用于打开一个指定的文件路径，并根据指定的flags设置各种flags，并根据指定的mode设置它的mode。
此方法返回新打开文件的文件描述符。返回的文件描述符是不可继承的。

Syntax: os.open(path, flags, mode = 0o777, *, dir_fd = None)

Parameters:
Path: A path-like object representing the file system path. This is the file path to be opened.
A path-like object is a string or bytes object which represents a path.
flags: This parameter specify the flags to be set for newly opened file.
mode (optional): A numeric value representing the mode of the newly opened file. The default value of this parameter is 0o777 (octal).
dir_fd (optional): A file descriptor referring to a directory.

Return Type: This method returns a file descriptor for newly opened file.

代码：使用os.open()方法打开文件路径

# Python program to explain os.open() method 
  
# importing os module 
import os
  
  
# File path to be opened
path = './file9.txt'
  
# Mode to be set 
mode = 0o666
  
# flags
flags = os.O_RDWR | os.O_CREAT
  
  
# Open the specified file path
# using os.open() method
# and get the file descriptor for 
# opened file path
fd = os.open(path, flags, mode)
  
print("File path opened successfully.")
  
  
# Write a string to the file
# using file descriptor
str = "GeeksforGeeks: A computer science portal for geeks."
os.write(fd, str.encode())
print("String written to the file descriptor.") 
  
  
# Now read the file 
# from beginning
os.lseek(fd, 0, 0)
str = os.read(fd, os.path.getsize(fd))
print("\nString read from the file descriptor:")
print(str.decode())
  
# Close the file descriptor
os.close(fd)
print("\nFile descriptor closed successfully.")

输出：

File path opened successfully.
String written to the file descriptor.

String read from file descriptor:
GeeksforGeeks: A computer science portal for geeks.

File descriptor closed successfully.

参考： https://docs。 Python.org/3/library/os.html#os.open