Pyvim

Common errors

• ModuleNotFoundError: No module named 'pyVim'

  cause Attempting to import 'pyVim' (with a capital 'V') instead of 'pyvim' (lowercase 'v'). The 'pyVim' module is part of the `pyvmomi` library (VMware vSphere SDK), which is a completely different project.
  fix Ensure you are using `pip install pyvim` (lowercase) and importing `pyvim` if you are trying to access its internal components (though it's primarily a command-line tool). If you intended to use the VMware SDK, install `pyvmomi` with `pip install pyvmomi`.

• pyvim: command not found

  cause The `pyvim` executable is not in your system's PATH, or the installation was incomplete.
  fix Verify that `pyvim` is installed correctly (`pip show pyvim`). Ensure your Python environment's script directory is included in your system's PATH. On Linux/macOS, this is often `~/.local/bin` or a virtual environment's `bin` directory.

Warnings

• gotcha Performance can significantly degrade when editing large files (thousands of lines) with syntax highlighting enabled due to Python's string handling and Pygments processing.
  Fix: For very large files, consider disabling syntax highlighting or using native Vim/other editors optimized for large file performance.
• gotcha Pyvim's buffer implementation uses simple Python strings, which can be inefficient for extremely large files and may not scale as well as optimized text editor data structures.
  Fix: Be aware of potential memory and performance limitations when working with exceptionally large documents.
• gotcha The documentation on GitHub states compatibility up to Python 3.4. While PyPI's `requires_python` is empty (implying broader Python 3 support), explicit modern Python 3 compatibility (e.g., 3.9+) is not clearly documented by the project author.
  Fix: Test `pyvim` with your target Python 3 version to ensure full compatibility. The project's underlying `prompt_toolkit` generally supports modern Python versions.
• breaking Lack of individual cursor support across split windows can lead to unexpected behavior where the cursor in one window affects other splits, including unintended scrolling.
  Fix: This is a known limitation of the `prompt_toolkit` library that `pyvim` is built upon and may not have a direct workaround within `pyvim` itself. Be mindful of this behavior when using split views.

Install

• pip install pyvim Install stable version

Imports

• pyvim (executable)
  wrong:

  from pyvim import Editor

  correct:

  Run 'pyvim' directly from the terminal or via subprocess

  Pyvim is primarily a command-line application, not designed for direct library import of its editor functionality. Components are usually accessed via `prompt_toolkit`.
• pyVim (case-sensitive)
  wrong:

  from pyVim import connect

  correct:

  pip install pyvim (for this library), pip install pyvmomi (for VMware SDK)

  Common `ModuleNotFoundError` due to confusion with the unrelated `pyVim` module which is part of the `pyvmomi` (VMware vSphere SDK) library and uses a capital 'V'. 'pyvim' (lowercase 'v') is a distinct project.

Quickstart

This quickstart demonstrates how to programmatically launch the `pyvim` editor using Python's `subprocess` module. It creates a temporary file, opens it in `pyvim`, and then displays the file's content after the editor is closed. Users interact with `pyvim` directly in their terminal.

import subprocess
import os

# Create a dummy file for editing
file_content = "Hello, pyvim!\nThis is a test file.\n"
with open("example.txt", "w") as f:
    f.write(file_content)

print("Launching pyvim to edit example.txt. Press ESC, then :wq to save and exit.")

try:
    # Launch pyvim as a subprocess
    # The input/output will be connected to the current terminal
    subprocess.run(["pyvim", "example.txt"])
except FileNotFoundError:
    print("Error: 'pyvim' executable not found. Make sure it's installed and in your PATH.")
except Exception as e:
    print(f"An error occurred: {e}")

# Optionally, print the content after editing
if os.path.exists("example.txt"):
    with open("example.txt", "r") as f:
        print("\nContent of example.txt after editing:")
        print(f.read())