How to print only the first 10 lines from a csv file using Python?

How to print only the first 10 lines from a csv file using Python?

To print only the first 10 lines from a CSV file using Python, you can utilize the csv module along with basic file handling. Here's a step-by-step approach to achieve this:

Example CSV File

Assume you have a CSV file named data.csv with the following contents:

Name,Age,City John,28,New York Alice,25,San Francisco Bob,32,Chicago Eve,30,Los Angeles Mark,27,Boston Lily,29,Seattle Jake,26,Austin Sophie,31,Denver Mike,24,Portland Emma,33,Miami Anna,22,Atlanta

Python Script to Print First 10 Lines

Here's how you can write a Python script to print only the first 10 lines from data.csv:

import csv # Define the CSV file path csv_file = 'data.csv' # Open the CSV file for reading with open(csv_file, mode='r', newline='') as file: reader = csv.reader(file) # Initialize a counter line_count = 0 # Iterate through each row in the CSV file for row in reader: # Print the row print(', '.join(row)) # Increment the line count line_count += 1 # Stop printing after 10 lines if line_count >= 10: break

Explanation:

  1. Importing the csv Module: The csv module is used to handle CSV files in Python.

  2. Opening the CSV File: The open() function is used with mode='r' to open the file in read mode. newline='' ensures universal newline support.

  3. Reading the CSV File: csv.reader(file) creates a reader object to iterate over lines in the CSV file.

  4. Iterating and Printing Rows:

    • The script iterates through each row using a for loop.
    • print(', '.join(row)) prints each row. Adjust the separator (', ' in this case) as per your CSV file format.

  5. Counting Lines:

    • line_count keeps track of the number of lines printed.
    • The loop breaks (break) after printing 10 lines (if line_count >= 10).

  6. File Closure: The file is automatically closed after exiting the with block due to its use as a context manager.

Notes:

  • Adjust the csv_file variable to match the path and name of your actual CSV file.
  • Modify the print(', '.join(row)) statement to format and print each row according to your specific CSV structure.
  • This approach efficiently reads and prints only the necessary lines, ensuring performance and clarity.

By following these steps, you can print only the first 10 lines from a CSV file using Python effectively.

Examples

  1. Read and print first 10 lines from a CSV file using Python: Description: Open a CSV file and print only the first 10 lines.

    import csv with open('data.csv', 'r') as file: reader = csv.reader(file) for i, row in enumerate(reader): if i < 10: print(row) else: break

  2. Using pandas to display the first 10 rows of a CSV file: Description: Use pandas to load and display the first 10 rows of a CSV file.

    import pandas as pd df = pd.read_csv('data.csv') print(df.head(10))

  3. Read only the header and first 10 lines from a CSV file: Description: Read the header and first 10 data rows separately from a CSV file.

    import csv with open('data.csv', 'r') as file: reader = csv.reader(file) header = next(reader) # Read the header data = [next(reader) for _ in range(10)] # Read the first 10 data rows print(header) print(data)

  4. Skipping empty or commented lines while printing from a CSV file: Description: Skip empty or commented lines and print the first 10 valid rows from a CSV file.

    import csv with open('data.csv', 'r') as file: reader = csv.reader(file) count = 0 for row in reader: if row and not row[0].startswith('#'): # Skip empty and commented lines print(row) count += 1 if count >= 10: break

  5. Using csv.DictReader to print the first 10 lines with headers: Description: Use csv.DictReader to print the first 10 lines of a CSV file with headers.

    import csv with open('data.csv', 'r') as file: reader = csv.DictReader(file) for i, row in enumerate(reader): if i < 10: print(row) else: break

  6. Read and display specific columns from the first 10 lines of a CSV file: Description: Read specific columns from the first 10 lines of a CSV file and print them.

    import csv with open('data.csv', 'r') as file: reader = csv.reader(file) header = next(reader) # Skip header for i, row in enumerate(reader): if i >= 10: break print(row[0], row[2]) # Example: Print first and third columns

  7. Read and print only non-empty lines from the first 10 lines of a CSV file: Description: Print only non-empty lines from the first 10 lines of a CSV file.

    import csv with open('data.csv', 'r') as file: reader = csv.reader(file) for i, row in enumerate(reader): if i >= 10 or not any(row): break print(row)

  8. Using pandas to skip rows and print the first 10 lines of a CSV file: Description: Use pandas to skip rows and print the first 10 lines of a CSV file.

    import pandas as pd df = pd.read_csv('data.csv', skiprows=0, nrows=10) print(df)

  9. Handle encoding issues while printing the first 10 lines of a CSV file: Description: Handle encoding errors that may occur when printing from a CSV file.

    import csv with open('data.csv', 'r', encoding='utf-8', errors='ignore') as file: reader = csv.reader(file) for i, row in enumerate(reader): if i < 10: print(row) else: break

  10. Using pathlib to read and print the first 10 lines of a CSV file: Description: Use pathlib to handle file paths and read the first 10 lines of a CSV file.

    from pathlib import Path import csv file_path = Path('data.csv') with file_path.open('r') as file: reader = csv.reader(file) for i, row in enumerate(reader): if i < 10: print(row) else: break

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