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I enter 'scrapy crawl PROJECT_NAME' in terminal and try to run a project coded with python2 but terminal tries to use scrapy in python3 and keeps reporting error(I have scrapy library for both python2/3).

It could recognise python version of my project at first. But it fails to work now.

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Just specify the python you want to run scrapy with:

python2 -m scrapy crawl PROJECT_NAME

Or even more precise:

/path/to/python/executable/python -m scrapy crawl PROJECT_NAME
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