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。
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...
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...
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...
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...
File "/Users/zoezhang/PycharmProjects/learnpython/learn-内嵌函数.py", line 8, in fun2() NameError: name 'fun2' is not defined 1. 2. 3. 4. 5. 6. 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 5.闭包():如果在一个内部函数里,对外部作用域(但不是在全局作用域)...
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.
情况一: a 直接引用外部的,正常运行 deftoplevel(): a =5defnested(): print(a +2)# theres no local variable a so it prints the nonlocal onenested()returna 情况二:创建local 变量a,直接打印,正常运行 deftoplevel(): a =5defnested(): ...
2019-09-27 14:44 −The JAVA_HOME environment variable is not defined correctlyThis environment variable is needed to run this programNB: JAVA_HOME should point to a JDK ... 那些年的代码 0 18004 java.sql.SQLException: Unknown system variable 'query_cache_size' ...