Python Programming Training Certification
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Course Overview
Python open() Function
The python open() function opens the file and returns a corresponding file object.
Signature
- open(file, mode=’r’, buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None)
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 returns a file object which can used to read, write and modify file.
Python open() Function Example 1
The below example shows how to open a file in Python.
- # opens python.text file of the current directory
f = open(“python.txt”)
# specifying full path
f = open(“C:/Python33/README.txt”)
Output:
- Since the mode is omitted, the file is opened in ‘r’ mode; opens for reading.
Python open() Function Example 2
The below example providing mode to open().
- # 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:
- f = open(“path_to_file”, mode = ‘r’, encoding=’utf-8′)
Explanation: In the above example, we specify different modes(‘r’, ‘w’, ‘a’) for opening a file.
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