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Table of Contents
? Recommended method: use with open() and for loop
? Other common scenarios and techniques
1. Skip empty lines while reading
2. Read only the first N lines (such as the first 5 lines)
3. Get the line number (with numbered output)
4. Process certain lines according to conditions (such as lines containing keywords)
?? Not recommended (prone to problems)
? Summary: Key points
Home Backend Development Python Tutorial python read file line by line example

python read file line by line example

Jul 30, 2025 am 03:34 AM
python file reading

The recommended way to read files line by line in Python is to use with open() and for loops. 1. Use with open('example.txt', 'r', encoding='utf-8') as file: to ensure safe closing of the file; 2. Use for line in file: to realize line-by-line reading, memory-friendly; 3. Use line.strip() to remove line-breaks and whitespace characters; 4. Specify encoding='utf-8' to prevent encoding errors; other techniques include skipping blank lines, reading N lines before, getting line numbers and processing lines according to conditions, and always avoiding manual opening without closing. This method is complete and efficient, suitable for large file processing, and is recommended for use in actual projects.

python read file line by line example

Reading files line by line in Python is a very common operation and is often used to process log files, configuration files, or large amounts of text data. Here is a simple and practical example showing how to read files line by line.

python read file line by line example
 with open('example.txt', 'r', encoding='utf-8') as file:
    for line in file:
        line = line.strip() # Remove the beginning and end whitespace characters (such as line breaks)
        print(line)

illustrate:

  • with open() ensures that the file is automatically closed after use, and is safe even if an exception occurs.
  • encoding='utf-8' avoid encoding errors in Chinese or special characters (adjust according to actual conditions).
  • line.strip() removes the \n or \r\n line breaks at the end of each line, as well as extra spaces.

? Other common scenarios and techniques

1. Skip empty lines while reading

 with open('example.txt', 'r', encoding='utf-8') as file:
    for line in file:
        line = line.strip()
        if not line: # Skip the blank line continue
        print(line)

2. Read only the first N lines (such as the first 5 lines)

 from itertools import islice

with open('example.txt', 'r', encoding='utf-8') as file:
    for line in islice(file, 5): # read the first 5 lines print(line.strip())

3. Get the line number (with numbered output)

 with open('example.txt', 'r', encoding='utf-8') as file:
    for lineno, line in enumerate(file, 1):
        print(f"{lineno}: {line.strip()}")

4. Process certain lines according to conditions (such as lines containing keywords)

 with open('example.txt', 'r', encoding='utf-8') as file:
    for line in file:
        if 'error' in line.lower():
            print("Error line found:", line.strip())

 # ? Not recommended: Manually open but forget to close
file = open('example.txt', 'r')
for line in file:
    print(line.strip())
file.close() # If an error occurred before, this sentence may not be executed

Always give priority to using the with context manager.

python read file line by line example

? Summary: Key points

  • ? Use with open() to safely read files
  • ? Use for line in file: read line by line, memory friendly (suitable for large files)
  • ? Add strip() to remove unnecessary line breaks and spaces
  • ? Specify encoding to prevent garbled code (especially in Windows environments)

Basically that's it. Not complicated, but it is easy to ignore details.

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