Python - File Reading and Writing Strategies
Which method is best to read a very large text file without using too much memory?
with open('file.txt', 'r') as f:
Which method is best to read a very large text file without using too much memory?with open('file.txt', 'r') as f:
easy📝 Conceptual Q11 of 15
Step-by-Step Solution
Solution:
Step 1: Understand memory usage when reading files
Reading the entire file at once loads all content into memory, which is bad for large files.Step 2: Use line-by-line reading to save memory
Usingfor line in f:reads one line at a time, keeping memory low.Final Answer:
Read the file line by line using a loop likefor line in f:-> Option CQuick Check:
Line-by-line reading = low memory use [OK]
Quick Trick: Read files line-by-line to save memory with large files [OK]
Common Mistakes:
- Using f.read() loads whole file into memory
- Using f.readlines() loads all lines at once
- Converting file to list loads entire file
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