Why Does Python `subprocess.readline()` Hang When Streaming Ruby Output, and How Can I Fix It?

Python subprocess Readlines() Causes Hangups in Stream

The goal of the code is to stream a Ruby file and output its contents gradually. While the streaming aspect is achieved, encountering an issue where readline() hangs indefinitely, preventing further execution.

Exploration of Potential Solutions

Using pty is a platform-dependent approach that assumes Linux or compatible OS support. However, considering cross-platform compatibility concerns:

• Pexpect: This library could provide an alternative method to manage process interaction.
• stdbuf: This tool allows for line-buffering in non-interactive mode, enabling immediate output.
• Modified pty Approach:

A suggested improvement to the existing pty implementation:

Conclusion

All three proposed solutions address the issue by enabling line-buffering for immediate output, while the revised pty approach ensures graceful handling of input and output while maximizing platform compatibility.

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