Java, J2EE & SOA Certification Training
- 33k Enrolled Learners
- Live Class
Python is one of the most powerful programming languages available in the industry today. Thanks to its wide number of features and great versatility, a lot of complex programming objectives can be achieved in Python quite easily. In this article, we will discuss OS Module in Python in the following order:
What is the OS Module in Python?
The OS module in Python is a part of the standard library of the programming language. When imported, it lets the user interact with the native OS Python is currently running on. In simple terms, it provides an easy way for the user to interact with several os functions that come in handy in day to day programming.
The OS module and os.path modules are the same and can be easily imported from the standard library, at a moment’s notice.
Functions of the OS module
Now that you know the definition of the OS module, let us look at some of its functions.
import os print(os.name)
Note: The above program will give a different output depending upon the operating system you are currently using.
os.getcwd(): If you want to know the Current Working Directory or CWD that has been used to run your code, then you can make use of this function. Similar to the os.name function, the output of this will vary depending upon the system it is installed on.
import os print(os.getcwd()) # To print absolute path on your system # os.path.abspath('.') # To print files and directories in the current directory # on your system # os.listdir('.')
Note: If you are using a GFG interpreter, then the directory used by default will be /root.
os.error: Whenever you are using a module or function in Python that has been imported from the standard library, it will raise an OSError in case you have used incorrect path as well as file names, or have used an argument that has the correct type but is not accepted by the operating system you are currently using. This function is an alias of the inbuilt OSError exception in Python. Take a look at the example below to understand this better.
import os try: # If the file does not exist, # then it would throw an IOError filename = 'GFG.txt' f = open(filename, 'rU') text = f.read() f.close() # Control jumps directly to here if #any of the above lines throws IOError. except IOError: # print(os.error) will <class 'OSError'> print('Problem reading: ' + filename) # In any case, the code then continues with # the line after the try/except
Problem reading: GFG.txt
os.popen(): This function is a part of file object manipulation and is used to open a pipe to and from a command. The return value of this function can be read or written dependent upon your use of r or w. The syntax for this function is as follows, os.popen(command[, mode[, bufsize]]). The parameters taken into consideration are, mode as well as bufsize. Take a look at the example below to understand this better.
import os fd = "GFG.txt" # popen() is similar to open() file = open(fd, 'w') file.write("Hello") file.close() file = open(fd, 'r') text = file.read() print(text) # popen() provides a pipe/gateway and accesses the file directly file = os.popen(fd, 'w') file.write("Hello") # File not closed, shown in the next function.
os.close(): If you want to close the file directory fd, then you can make use of this function. When used, a file needs to be opened first using the open() function and then closed using the close() function. Take a look at the example below to understand this better.
import os fd = "GFG.txt" file = open(fd, 'r') text = file.read() print(text) os.close(file)
Traceback (most recent call last):
File "C:UsersGFGDesktopGeeksForGeeksOSFile.py", line 6, in
TypeError: an integer is required (got type _io.TextIOWrapper)
os.rename(): If in a certain situation you need to rename an old text file that is already present, you can make use of this function. Note: The name of the file in context is only changed if the file already exists in the directory and the user has appropriate permission to do the same. Take a look at the example below to understand this better.
import os fd = "GFG.txt" os.rename(fd,'New.txt') os.rename(fd,'New.txt')
Traceback (most recent call last):
File "C:UsersGFGDesktopModuleOSGeeksForGeeksOSFile.py", line 3, in
FileNotFoundError: [WinError 2] The system cannot find the
file specified: 'GFG.txt' -> 'New.txt'
The os module in Python can be used to access a lot of operating system functions. Now that you know its uses, we hope that you will make use of the same in your day to day programming.
With this, we come to an end of this OS Module in Python. I hope all your doubts about OS Module is cleared now.
To get in-depth knowledge on Python along with its various applications, you can enroll here for live online training with 24/7 support and lifetime access.
Got a question for us? Mention them in the comments section of “Membership Operators in Python” and we will get back to you.