Python - File Reading and Writing Strategies
You want to copy a large binary file efficiently in Python without loading it all at once. Which code snippet is best?
You want to copy a large binary file efficiently in Python without loading it all at once. Which code snippet is best?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Use binary mode and chunked reading
Opening files in binary mode'rb'and'wb'is required for binary files. Reading in chunks avoids loading entire file.Step 2: Use a loop with walrus operator to read and write chunks
This method reads 4096 bytes at a time and writes them, efficiently copying large files.Final Answer:
with open('source.bin', 'rb') as src, open('dest.bin', 'wb') as dst: while chunk := src.read(4096): dst.write(chunk) -> Option AQuick Check:
Efficient binary copy = B [OK]
Quick Trick: Copy large files in chunks with binary mode [OK]
Common Mistakes:
- Reading whole file at once
- Using text mode for binary files
- Using readlines() on binary files
- Not looping to copy chunks
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