英文:
PyInstaller can have unexpected behavior if an `__init__.py ` parses the sys args
问题
我有一个名为dep的包，在dep/__init__.py中会解析sys.argv：
# dep/__init__.py
import sys
expected_args = ['--arg']
for arg in sys.argv:
if arg not in expected_args:
print(f"Got unexpected arg: {arg}")
我的主程序是：
# main.py
import dep
if __name__ == '__main__':
print("hello world")
如果我调用pyinstaller main.py，PyInstaller会导入所有依赖项并运行所有的__init__.py，这将导致"Got unexpected arg:"，其中参数是PyInstaller\isolated\_child.py, 1300(用于PyInstaller IO的随机数), 1296(用于PyInstaller IO的随机数)。
如何避免这个问题？
英文:
I have a package dep, where the dep/__init__.py will parse the sys.argv
# dep/__init__.py
import sys
expected_args = ['--arg']
for arg in sys.argv:
if arg not in expected_args:
print(f"Got unexpected arg: {arg}")
my MAIN is
# main.py
import dep
if __name__ == '__main__':
print("hello world")
If I call pyinstaller main.py, PyInstaller will import all its dependencies and run all __init__.py, this will result in "Got unexpected arg:"
where the args are PyInstaller\isolated\_child.py, 1300(a random number for PyInstaller IO), 1296(a random number for PyInstaller IO)
How to avoid this issue?
答案1
得分: 1
当你导入一个包含在全局范围写的代码的模块时，该代码会在导入时立即运行。为了避免这种情况，只需将其封装在一个函数中。
dep.py
import sys
def check_args():
expected_args = ['--arg']
for arg in sys.argv:
if arg not in expected_args:
print(f"收到意外的参数: {arg}")
__main__.py
import dep
if __name__ == '__main__':
print("你好，世界")
dep.check_args()
英文:
When you import a module that has code written in the global scope, the code is run immediately upon import. In order to avoid this, just wrap it in a function.
dep.py
import sys
def check_args():
expected_args = ['--arg']
for arg in sys.argv:
if arg not in expected_args:
print(f"Got unexpected arg: {arg}")
__main__.py
import dep
if __name__ == '__main__':
print("hello world")
dep.check_args()
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