unicodecsv Library

Warnings

• breaking unicodecsv is fundamentally incompatible with Python 3's `csv` module. Python 3's `csv` module expects text streams, not byte streams, and handles unicode automatically. Using `unicodecsv` in Python 3 will lead to `TypeError` or incorrect encoding behavior.
  Fix: For Python 3, use the standard library's `csv` module directly. It natively supports Unicode and is the correct approach for modern Python applications.
• deprecated This library is effectively abandoned and unmaintained since its last release in 2016. Its primary purpose was to address Unicode issues in Python 2's standard `csv` module. Python 3's `csv` module resolved these issues natively, making this library obsolete for modern Python development.
  Fix: Migrate to Python 3 and use the built-in `csv` module for Unicode CSV handling.
• gotcha unicodecsv is designed *exclusively* for Python 2. Attempting to use it in a Python 3 environment is incorrect and will introduce unnecessary complexity and potential encoding errors. It adds no value in Python 3.
  Fix: Do not install or use `unicodecsv` in Python 3 projects. Rely on the standard `csv` library instead.
• gotcha When using `unicodecsv` in Python 2, ensure files are opened in binary mode (e.g., `open('filename', 'wb')` or `open('filename', 'rb')`). The library expects byte streams for its internal encoding/decoding mechanism.
  Fix: Always use binary mode (`'wb'`, `'rb'`) when opening files for `unicodecsv.writer` or `unicodecsv.reader` in Python 2.

Install

• pip install unicodecsv Install with pip

Imports

• csv

  import unicodecsv as csv

• reader

  from unicodecsv import reader

• writer

  from unicodecsv import writer

Quickstart

Demonstrates writing and reading Unicode data using `unicodecsv` with `io.BytesIO` to simulate file operations. This library is specifically designed for Python 2 to correctly handle Unicode CSV files.

import unicodecsv as csv
import io

# This example demonstrates unicodecsv in a Python 2-like environment.
# In Python 3, the standard `csv` module handles unicode correctly.

# Simulate a file-like object for writing (expecting bytes)
output_buffer = io.BytesIO()
writer = csv.writer(output_buffer, encoding='utf-8')
writer.writerow(['héllø', 'wørld', '😊'])
writer.writerow(['line 2', 'value 2', 'another'])

# Get the byte content written to the buffer
csv_bytes = output_buffer.getvalue()
print("unicodecsv: Written CSV bytes (Python 2 style):")
print(csv_bytes.decode('utf-8')) # Decode for printing in Python 3 console

# Simulate a file-like object for reading
input_buffer = io.BytesIO(csv_bytes)
reader = csv.reader(input_buffer, encoding='utf-8')

print("\nunicodecsv: Read CSV rows (Python 2 style):")
for row in reader:
    print(row)

# Expected output in a Python 2 environment would be lists of unicode strings.