Python Append File | Write on Existing File | Examples

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 functions 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 the 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.

#Opening file
file_obj  = open("filename", "mode")
# write text into file 
file_obj.write("Append file")

Modes

Modes are important in Python file Handling, here are some types we are mentioning with detail.

• w write 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.
• r read mode – (Only read the file ) is the default in the open function. The stream is positioned at the beginning of the file.
• a append 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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1. Question 1 of 10

   1. Question

   Which of the following command is used to open a file “c:\textFile.txt” in read-mode only?

   • file = open(“c:\ textFile.txt”, “r”)
   • file = open(“c:\\ textFile.txt”, “r”)
   • file = open(file = “c:\ textFile.txt”, “r+”)
   • file = open(file = “c:\\ textFile.txt”, “r+”)
   Correct
   

   Incorrect
   
2. Question 2 of 10

   2. Question

   Which functions use to check if a file exists?
   File name = “logo”

   • os.path.isFile(logo)
   • os.path.exists(logo)
   • os.path.isfile(logo)
   • os.isFile(logo)
   Correct
   

   Incorrect
   
3. Question 3 of 10

   3. Question

   How do you insert something on a new line in a file?

   • \n
   • write.newline('x')
   • type the content on the line below
   • You cannot do this
   Correct
   

   Incorrect
   
4. Question 4 of 10

   4. Question

   Appending to a file means adding extra data into the file.

   • True
   • False
   Correct
   

   Incorrect
   
5. Question 5 of 10

   5. Question

   What is the last action that must be performed on a file?

   • Save
   • Close
   • End
   • Write
   Correct
   

   Incorrect
   
6. Question 6 of 10

   6. Question

   What is the data type of data read from a file?

   • Boolean
   • Real
   • Number
   • String
   Correct
   

   Incorrect
   
7. Question 7 of 10

   7. Question

   Can you create a file without using file modes in Python?

   • True
   • False
   Correct
   

   Incorrect
   
8. Question 8 of 10

   8. Question

   Reading from a file often involves using…

   • Comments
   • A loop
   • A condition
   • None
   Correct
   

   Incorrect
   
9. Question 9 of 10

   9. Question

   Which of the following statements are true regarding the opening modes of a file?

   • When you open a file for reading, if the file does not exist, an error occurs.
   • When you open a file for writing, if the file does not exist, an error occurs.
   • When you open a file for reading, if the file does not exist, the program will open an empty file.
   • When you open a file for writing, if the file does not exist, a new file is created.
   • When you open a file for writing, if the file exists, the existing file is overwritten with the new file.
   Correct
   

   Incorrect
   
10. Question 10 of 10

    10. Question

    Which of the following commands option right to read the entire contents of a file as a string using the file object ?

    • tmpfile.read(n)
    • tmpfile.read()
    • tmpfile.readline()
    • tmpfile.readlines()
    Correct
    

    Incorrect
    

Do comment in below if any doubt and suggestion.

Note: This example (Project) is developed in PyCharm 2018.2 (Community Edition)
JRE: 1.8.0
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.13.6

Python 3.7

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.

Rohit

Degree in Computer Science and Engineer: App Developer and has multiple Programming languages experience. Enthusiasm for technology & like learning technical.

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