不理解 processing.py

如何解决不理解 processing.py

所以我正在使用 Processing.py，除了我通过 IDLE 使用它，因为我的项目也需要 python 模块，但我收到一个对我来说毫无意义的错误。想知道这里是否有人对我如何修复它有任何想法？

这是我得到的错误：

>>> The file "Background.png" is missing or inaccessible,make sure the URL is valid or that the file has been added to your sketch and is readable.

>> java.lang.NullPointerException
>>  at processing.core.PGraphics.image(PGraphics.java:3767)
>>  at processing.core.papplet.image(papplet.java:12132)
>>  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>>  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>  at java.lang.reflect.Method.invoke(Method.java:498)
>>  at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:186)
>>  at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:204)
>>  at org.python.core.PyObject.__call__(PyObject.java:515)
>>  at org.python.core.PyObject.__call__(PyObject.java:521)
>>  at org.python.core.PyMethod.__call__(PyMethod.java:171)
>>  at org.python.pycode._pyx7.f$0(<string>:1)
>>  at org.python.pycode._pyx7.call_function(<string>)
>>  at org.python.core.PyTableCode.call(PyTableCode.java:167)
>>  at org.python.core.PyCode.call(PyCode.java:18)
>>  at org.python.core.Py.runcode(Py.java:1386)
>>  at org.python.core.Py.exec(Py.java:1430)
>>  at org.python.pycode._pyx5.listen$5(i3_jython.py:28)
>>  at org.python.pycode._pyx5.call_function(i3_jython.py)
>>  at org.python.core.PyTableCode.call(PyTableCode.java:167)
>>  at org.python.core.PyBaseCode.call(PyBaseCode.java:124)
>>  at org.python.core.PyFunction.__call__(PyFunction.java:403)
>>  at org.python.pycode._pyx5.draw$2(i3_jython.py:19)
>>  at org.python.pycode._pyx5.call_function(i3_jython.py)
>>  at org.python.core.PyTableCode.call(PyTableCode.java:167)
>>  at org.python.core.PyBaseCode.call(PyBaseCode.java:124)
>>  at org.python.core.PyFunction.__call__(PyFunction.java:403)
>>  at org.python.core.PyFunction.__call__(PyFunction.java:398)
>>  at jycessing.pappletJythonDriver.draw(pappletJythonDriver.java:1059)
>>  at processing.core.papplet.handleDraw(papplet.java:2403)
>>  at processing.awt.PSurfaceAWT$12.callDraw(PSurfaceAWT.java:1527)
>>  at processing.core.PSurfaceNone$AnimationThread.run(PSurfaceNone.java:316)

附件是我的文件结构，它清楚地表明我实际上在工作目录中有图像文件

希望有人能帮忙

解决方法

很可能工作目录不是脚本实际所在的位置。这可以通过获取“background.png”的绝对路径来解决，如下所示：

import os
dirname = os.getcwd()
filepath = dirname + '/background.png'