When you want an add content without deleting existing content, you have to use the Python Append File Handling scenario. Append methods in Python file handling use for add connote at the end of file content.
How to Python Append File?
How to open an existing file and write the content at the last, you have to use a python in build method (function)
Open to get a file object. The file object has function and attributes to content write an update in the file etc.
The syntax of Python Append File
Where file_obj is a variable to hold file object. The mode argument is required as an ‘a’ because the default value of ‘r’ will be assumed if it is omitted. Where ‘a ‘value stands for append mode.
file_obj = open("filename", "mode")
# write text into file
Modes are important in Python file Handling, here are some types we are mentioning with detail.
wwrite mode – if the file doesn’t exist create it and open it in write mode. The stream is positioned at the beginning of the file.
rread mode – (Only read the file ) is default in open function. The stream is positioned at the beginning of the file.
aappend mode (if the file doesn’t exist create it and open it in append mode). The stream is positioned at the end of the file.
Examples of Python Append File:
Assume we have the empty “testFile.txt” file, located in the same folder as Python with content “Hello world“.
Now writing the file.
‘a’ – Append mode
f = open("testFile.txt", "a")
f.write(" Append file")
Output: in the text file
Python File Handling Quiz
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Python File Handling to test your knowledge – ( Create, Open, Update, delete and more about in Python)
It’s for Beginners, Advanced and Experienced Programmers.
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Question 1 of 10
Which of the following command is used to open a file “c:\textFile.txt” in read-mode only?Correct
Question 2 of 10
Which functions use to check if a file exists?
File name = “logo”Correct
Question 3 of 10
How do you insert something on a new line in a file?Correct
Question 4 of 10
Appending to a file means adding extra data into the file.Correct
Question 5 of 10
What is the last action that must be performed on a file?Correct
Question 6 of 10
What is the data type of data read from a file?Correct
Question 7 of 10
Can you create a file without using file modes in Python?Correct
Question 8 of 10
Reading from a file often involves using…Correct
Question 9 of 10
Which of the following statements are true regarding the opening modes of a file?Correct
Question 10 of 10
Which of the following commands option right to read the entire contents of a file as a string using the file object
Do comment in below if any doubt and suggestion.
Note: This example (Project) is developed in PyCharm 2018.2 (Community Edition)
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
All Examples Python Append File and Write on Existing File are in Python 3, so it may change its different from python 2 or upgraded versions.