[英]how should I change "__main__" str to run file that has if __name__=="__main__":
[英]How do I use “if __name__ == '__main__':” in a .bat file?
我有一个在 Spyder 中运行良好的多处理函数,如下所示:
if __name__ == '__main__':
global results
p = Pool(20)
results = p.map(get_api_item, date_list)
p.terminate()
p.join()
result = pd.concat(results)
path = r'<path>'
result.to_csv(os.path.join(path,r'api_item.csv'), index=False)
当我在 .bat 文件中运行该 .py 文件时...
@echo off
"E:\Python\Anaconda3\python.exe" "E:\Projects\api.py" %*
pause
...我收到此错误:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "E:\Python\Anaconda3\lib\multiprocessing\spawn.py", line 105, in spawn_ma
in
exitcode = _main(fd)
File "E:\Python\Anaconda3\lib\multiprocessing\spawn.py", line 114, in _main
prepare(preparation_data)
File "E:\Python\Anaconda3\lib\multiprocessing\spawn.py", line 225, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "E:\Python\Anaconda3\lib\multiprocessing\spawn.py", line 277, in _fixup_m
ain_from_path
run_name="__mp_main__")
File "E:\Python\Anaconda3\lib\runpy.py", line 263, in run_path
pkg_name=pkg_name, script_name=fname)
File "E:\Python\Anaconda3\lib\runpy.py", line 96, in _run_module_code
mod_name, mod_spec, pkg_name, script_name)
File "E:\Python\Anaconda3\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "<path to api>\api.py", line 29, in <module>
result = pd.concat(results)
NameError: name 'results' is not defined
我认为这是因为服务(.bat 文件)可能不会将其称为__main__
。 我该如何补救?
请阅读并理解多处理文档 ( https://docs.python.org/3.8/library/multiprocessing.html ) 中的警告:
安全导入主模块
确保新的 Python 解释器可以安全地导入主模块,而不会导致意外的副作用(例如启动新进程)。
您的模块将被其他进程导入,因此您不能根据__main__
块中的代码在全局(最外层)级别拥有代码。
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