Python - File Reading and Writing Strategies
Which Python construct allows you to iterate over a large file line by line without loading the entire file into memory?
Which Python construct allows you to iterate over a large file line by line without loading the entire file into memory?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Use file object iteration
In Python, iterating directly over the file object reads one line at a time, which is memory efficient.Step 2: Avoid loading entire file
Methods like read() or readlines() load the whole file or all lines into memory, which is inefficient for large files.Final Answer:
Using a for loop directly on the file object -> Option AQuick Check:
Iterate file object line-by-line [OK]
Quick Trick: Iterate file object directly for memory efficiency [OK]
Common Mistakes:
- Using read() loads entire file into memory
- Using readlines() returns all lines at once
- Using seek() does not read lines sequentially
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