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What happens if you open a file in Python with mode 'a' and write data to it?

easy📝 Conceptual Q1 of 15
Python - File Handling Fundamentals
What happens if you open a file in Python with mode 'a' and write data to it?
AThe file is opened for reading only, no writing allowed.
BData is added to the end of the file without deleting existing content.
CThe file is erased and new data is written from the start.
DAn error occurs because 'a' mode is invalid.
Step-by-Step Solution
Solution:

  1. Step 1: Understand mode 'a' in file handling

    Mode 'a' stands for append, which means new data is added at the end of the file.

  2. Step 2: Effect of writing in append mode

    Writing in append mode does not erase existing content but adds new content after it.

  3. Final Answer:

    Data is added to the end of the file without deleting existing content. -> Option B

  4. Quick Check:

    Append mode = Add data at end [OK]
Quick Trick: Use 'a' to add data without erasing file [OK]
Common Mistakes:
  • Confusing 'a' with 'w' mode
  • Thinking 'a' overwrites file
  • Using 'a' mode for reading only

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