The open function in Python is utilized to open a file, producing an associated file object in return.
Python open Function Syntax
It has the following syntax:
Example
open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None)
Parameters
Python open function has several parameters:
- file : It is a path like object giving the pathname of the file to be opened.
- mode (optional): It specifies the mode in which the file is opened. If not provided, it defaults to 'r' which means open for reading in text mode.
- buffering (optional): It is used to set buffering policy.
- encoding (optional): It is a name of the encoding to encode or decode the file.
- errors (optional): A string that specify how to handle encoding/decoding errors.
- newline (optional): It controls how newlines mode works (available values: None, ' ', '\n', 'r', and '\r\n'
- closefd (optional): It must be True (default) if given otherwise an exception will be raised.
- opener (optional): a custom opener; must return an open file descriptor.
Return
It provides a file object that can be utilized for reading, writing, and altering the contents of a file.
Different Examples for Python open function
In this section, we will explore multiple instances of the Python open function.
Python open Function Example 1
The following illustration demonstrates the process of opening a file using Python.
Example
# opens python.text file of the current directory
f = open("python.txt")
# specifying full path
f = open("C:/Python33/README.txt")
Output:
Output
Since the mode is omitted, the file is opened in 'r' mode; opens for reading.
Python open Function Example 2
The following example demonstrates how to specify the mode in the open function in Python.
Example
# file opens for read
f = open("path_to_file", mode='r')
# file opens for write
f = open("path_to_file", mode = 'w')
# file opens for writing to the end
f = open("path_to_file", mode = 'a')
Output:
Output
f = open("path_to_file", mode = 'r', encoding='utf-8')
Explanation:
In the preceding illustration, we indicate various modes ('r', 'w', 'a') that can be utilized when accessing a file.
