Q.For a newly created file, is there any difference between write() and append() methods?

This is a plain theory question asking about the behavior of file write methods when the file is newly created.

When you create a file for the first time, both write() and append() methods behave identically in terms of the final content written to the file. The difference lies in the mode you use to open the file, not in the methods themselves.

If you open a file in write mode ('w'), the file is created (if it doesn't exist) and you use the write() method to add content. If you open it in append mode ('a'), the file is also created (if it doesn't exist) and you use the write() method again — the mode is called "append" but the method is still write().

# Write mode - creates new file
f = open('newfile1.txt', 'w')
f.write('Hello World')
f.close()

# Append mode - also creates new file
f = open('newfile2.txt', 'a')
f.write('Hello World')
f.close()

Both files will contain exactly the same content: Hello World. …

The question asks about the practical difference between opening a file in write mode ('w') versus append mode ('a') when the file does not yet exist. Understanding file modes is fundamental to file handling in Python.

Why File Modes Matter

When you open a file in Python using open(), the mode parameter determines:

• Where the file pointer starts (beginning or end)
• Whether existing content is preserved or erased
• Whether the file is created if it doesn't exist

The two modes in question are:

• 'w' (write mode): Opens for writing. If the file exists, it truncates (erases) all existing content. If the file doesn't exist, it creates a new one.
• 'a' (append mode): Opens for appending. If the file exists, the file pointer is positioned at the end, preserving existing content. If the file doesn't exist, it creates a new one.

The Key Insight: Newly Created Files

When a file is newly created — meaning it doesn't exist before the open() call — both modes create an empty file and position the file pointer at the beginning (which is also the end, since the file is empty). There is no existing content to preserve or truncate.

# Scenario: file "new_file.txt" does not exist

# Using write mode
f1 = open("new_file.txt", "w")
f1.write("Hello World")
f1.close()

# Result: new_file.txt contains "Hello World"

# Scenario: file "another_new.txt" does not exist

# Using append mode
f2 = open("another_new.txt", "a")
f2.write("Hello World")
f2.close()

# Result: another_new.txt contains "Hello World"

In both cases, the file is created, and "Hello World" is written starting from position 0. The output is identical.

Where the Difference Appears

The distinction becomes critical when the file already exists:

# Assume "existing.txt" contains "Old Data"

# Write mode
f = open("existing.txt", "w")
f.write("New Data")
f.close()
# Result: "Old Data" is LOST; file now contains only "New Data"

# Append mode
f = open("existing.txt", "a")
f.write("New Data")
f.close() …