修复Python错误NameError: Variable is not defined 在上面的例子中,我们得到了NameError,因为我们调用了一个超出范围的变量。 让我们看看如何修复这个NameError:Variable is not defined。 #global scopea =3#Function to add two numbersdefdisplayScope():#local varaibleb=2print("The value of a = ",a)prin...
NameError: name 'variable_name' is not defined是一个常见的 Python 错误,通常是由于变量未定义或拼写错误引起的。通过仔细检查代码、确保变量在使用前已定义、注意变量的作用域以及使用调试工具,你可以有效地解决这个问题。
在Python编程中,UnboundLocalError是一个运行时错误,它发生在尝试访问一个在当前作用域内未被绑定(即未被赋值)的局部变量时。 错误信息UnboundLocalError: local variable ‘xxx’ referenced before assignment指出变量xxx在赋值之前就被引用了。 这种情况通常发生在函数内部,尤其是在使用循环或条件语句时,变量的赋值逻辑可...
File"windowBouncingBalls.py",line84,in<module>speed=[choice([-2,2]),choice([-2,2])]NameError: name'choice'isnotdefined You raise the missingchoiceidentifier when two things occur. The first thing requires you to use a standardimportstatement, like the following example, and the second thi...
其实一下就知道了,报错的原因是python认为bbb2不一定能被赋值。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 //只需要对bbb2先赋值就可以了def test(flag): bbb2=0if(a): bbb=aaa elif(b): bbb2=aaa2print(bbb2) 一、问题分析 UnboundLocalError是一种常见的错误,发生在尝试访问一个在当前作用域...
https://www.geeksforgeeks.org/difference-between-dir-and-vars-in-python/ vars(node) 只返回当前节点属性 dir(node) 不仅仅返回当前节点属性,还返回node节点的所有父亲节点的属性。 dir() Function: This function displays more attributes than vars() function, as it is not limited to an instance. It...
File "/Users/zoezhang/PycharmProjects/learnpython/learn-内嵌函数.py", line 8, in <module> fun2() NameError: name 'fun2' is not defined 注意:内嵌函数在调用的时候,只能在定义函数的内部能调用,不能全局调用 1. 2. 3. 4. 5. 6.
In general, a variable that is defined in a block is available in that block only. It is not accessible outside the block. Such a variable is called a local variable. Formal argument identifiers also behave as local variables. The following example will underline this point. An attempt to ...
Local Hello NameError: name 'message' is not defined Here, themessagevariable is local to thegreet()function, so it can only be accessed within the function. That's why we get an error when we try to access it outside thegreet()function. ...
File "/usr/local/lib/python2.3/site-packages/django/contrib/admin/views/main.py", line 298, in get_results result_list = p.get_page(page_num) NameError: global name 'p' is not defined 附件(1) Oldest first Newest first Show comments Show property changes 变更...