> os.path.isdir('/usr/bin') # Check if path is a directory > os.path.isfile('/usr/bin') # Check if path is a file > os.path.exists('/usr/bin') # Check if the path exists (as a file/directory/Symlink)
os.path.isfile( file_path), os.path.isdir( dir_path), os.path.islink( link_path) -> bool: Check if the given path is a file, a directory, or a symlink. os.path.exists( path) -> bool: Check if the given path exists. The os.path module supports platform-independent operations on paths, by handling the path separator intelligently. 
The path separator is platform-dependent (Windows use '\', while Unixes/Mac OS use ' /'). Path Operations Using Module os.pathĪ path could be absolute (beginning with root) or relative to the current working directory (CWD). In Python, directory and file management are supported by modules os, os.path, shutil. ek( offset): sets the current stream position to offset bytes from the beginning of the file.įor example Directory and File Management.
The current stream position is the number of bytes from the beginning of the file in binary mode, and an opaque number in text mode.
fileObj.tell() -> int: returns the current stream position. Sys.exit(1) # Return a non-zero value to indicate abnormal termination # Check and retrieve command-line arguments #!/usr/bin/env python3 # -*- coding: UTF-8 -*- """įile_copy: Copy file line-by-line from source to destination The following script copies a file into another line-by-line, prepending each line with the line number. The with-statement is equivalent to the try-finally statement as follows:į.close() Example: Line-by-line File Copy Line = line.strip() # Strip the leading/trailing whitespaces and newline # Process the line # File closed automatically upon exit of with-statement With open('path/to/file.txt', 'r') as f: # Open file for read We can use a with-statement to open a file, which will be closed automatically upon exit, and a for-loop to read line-by-line as follows: > f.close() Processing Text File Line-by-Line Line = line.rstrip() # strip trailing spaces and newline # process the line print(line) line = f.readline() > f.close() # Read line-by-line using readline() in a while-loop > f.read() # Read entire file into a string > f.close() # Open the file for reading and read the entire file via read() > f.readline() # Return an empty string after EOF > f.readlines() # Read all (next) lines into a list of strings > f.readline() # Read next line into a string > f.close() # Always close the file # Check the contents of the file created # Open the file created for reading and read line(s) using readline() and readlines() #PYTHON MAC ADDRESS STRING FROM A SIMPLE STRING WINDOWS#
The '\n' will be translated to the platform-dependent newline ( '\r\n' for Windows or '\n' for Unixes/Mac OS).Įxamples # Open a file for writing and insert some records You need to explicitly terminate the str with a '\n', if needed.
fileObj.write( str) -> int: Write the given string to the file and return the number of characters written. fileObj.read() -> str: Read the entire file into a string. fileObj.readlines() -> : Read all lines into a list of strings. It returns an empty string after the end-of-file (EOF). fileObj.readline() -> str: (most commonly-used) Read next line (upto and include newline) and return a string (including newline). It initially positions at the beginning of the file and advances whenever read/write operations are performed. The fileObj returned after the file is opened maintains a file pointer. fileObj.close(): Flush and close the file stream. You can optionally specify the text encoding via keyword parameter encoding, e.g., encoding="utf-8". You can also use 'rb', 'wb', 'ab', 'rb+' for binary mode (raw-byte) operations. The available modes are: 'r' (read-only - default), 'w' (write - erase all contents for existing file), 'a' (append), 'r+' (read and write). open( file, ) -> fileObj: Open the file and return a file object. Python provides built-in functions and modules to support these operations. Open the file for read or write or both.
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