While reading or writing to a file, access mode governs the type of operations possible in the opened file. It refers to how the file will be used once it’s opened. These modes also define the location of the File Handle in the file. File handle is like a cursor, which defines from where the data has to be read or written in the file.
In order to append a new line to the existing file, open the file in append mode, by using either
'a+' as the access mode. The definition of these access modes are as follows:
- Append Only (‘a’): Open the file for writing. The file is created if it does not exist. The handle is positioned at the end of the file. The data being written will be inserted at the end, after the existing data.
- Append and Read (‘a+’): Open the file for reading and writing. The file is created if it does not exist. The handle is positioned at the end of the file. The data being written will be inserted at the end, after the existing data.
When the file is opened in append mode, the handle is positioned at the end of the file. The data being written will be inserted at the end, after the existing data. Let’s see the below example to clarify the difference between write mode and append mode.
Output of Readlines after appending This is Delhi This is Paris This is LondonToday Output of Readlines after writing Tomorrow
Append data from new line
In the above example, it can be seen that the data is not appended from the new line. This can be done by writing the newline
'\n' character to the file.
‘\n’ is treated as a special character of two bytes.
Output of Readlines after appending This is Delhi This is Paris This is London TodayTomorrow
with statement in Python is used in exception handling to make the code cleaner and much more readable. It simplifies the management of common resources like file streams. Unlike the above implementations, there is no need to call
file.close() when using
with statement. The
with statement itself ensures proper acquisition and release of resources.
Hello This is Delhi This is Paris This is London Today
Note: To know more about with statement click here.
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