Dangerous, liberal use of eval()

[umarbutler]

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🐛 Bug (问题描述)

I would like to flag that there are a number of scripts in your codebase that make use of eval() in ways that are unnecessary, overly liberal and possibly dangerous. In ppocr/postprocess/__init__.py, for example, eval() is used where a dictionary could easily perform the same functionality. In ppocr/data/imaug/__init__.py, the pattern from [script] import * is used 10 times and then eval() is used, which could easily have serious side-effects.

I would recommend refactoring the codebase to cease using eval().

For additional information on why eval() is dangerous, see https://lucumr.pocoo.org/2011/2/1/exec-in-python/ and https://nedbatchelder.com/blog/201206/eval_really_is_dangerous.html.

🏃‍♂️ Environment (运行环境)

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🌰 Minimal Reproducible Example (最小可复现问题的Demo)

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