A function definition is an executable statement. Its execution binds the function name in the current local namespace to a function object (a wrapper around the executable code for the function). This function object contains a reference to the current global namespace as the global namespace t...
File "<stdin>", line 1, in <module> TypeError: 'tuple' object is not callable 原因: t为元组,元组不能被调用,不能加()。初学者编写代码时,偶尔粗心会将变量当做方法来调用(不小心加了括号)。所以要认真检查下是否变量加了括号,或者方法漏加了括号。 解决方案: 将括号去除。 >>> t ('a', 'b',...
__import__ = None >>> import math Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'NoneType' object is not callable 除非出于日志或调试目的,用户一般很少修改 __import__() 函数,而且默认实现本身就提供了很多自定义机制。因此,我们只讨论默认实现。 __import...
结构体 PyCodeObject 在Include/code.h中定义如下: typedefstruct{PyObject_HEADintco_argcount;/* 位置参数个数 */intco_nlocals;/* 局部变量个数 */intco_stacksize;/* 栈大小 */intco_flags;PyObject*co_code;/* 字节码指令序列 */PyObject*co_consts;/* 所有常量集合 */PyObject*co_names;/* 所有符...
AttributeError: 'module' object has no attribute 'Path' 原因: sys模块没有Path属性。 解决方案: python对大小写敏感,Path和path代表不同的变量。将Path改为path即可。 >>> sys.path ['', '/usr/lib/python2.6/site-packages'] python知识拓展: ...
On Unix and Mac systems if you intend to install multiple versions of Python using the same installation prefix (--prefixargument to the configure script) you must take care that your primary python executable is not overwritten by the installation of a different version. All files and directorie...
NameError: name 'raw_input' is not defined 由于python3.x系列不再有 raw_input函数,3.x中 input 和从前的 raw_input 等效,把raw_input换成input即可。 SyntaxError: multiple statements found while compiling a single statement 这是因为整体复制过去运行而产生的错误;解决方案如下: ...
关于用python实现答题卡识别的方法中，需用到cv2模块，在实际实验中，遇到了cv2模块安装失败的问题，本...
obviously does not originate from an existing file. The last argument is a string indicating the code object type. There are three possible values: 'eval' Evaluatable expression [to be used with eval()] 'single' Single executable statement [to be used with exec] ...
There is no ffmpeg executable. You have to build it for ARM. The recipe builds a library, not an executable. After building the executable, copy it to the working directory. Android does not allow installing to the usual desktop directories....