NameError :(“在赋值给封闭范围之前引用了自由变量'type'"； [英] NameError: ("free variable 'type' referenced before assignment in enclosing scope"

问题描述

我正在使用此代码

dof = {i: dframe.apply(lambda x: x.str[i - 1] if type(x.iat[0]) == list else x) for i in range(1, 7)}

将此列表的数据帧转换为数据帧的dict，如本

to convert a dataframe of lists to a dict of dataframes, as given in this thread. The line works when I use it in a console, but when I include it in my script I get this message:

NameError: ("free variable 'type' referenced before assignment in enclosing scope", 'occurred at index duration')

如果不发布我的整个脚本，您能否建议我应该寻找导致此错误的内容?脚本中没有使用type作为变量，在其他地方也没有将x或i用作变量.

Without posting my whole script, can you suggest what I should be looking for that has generated this error? There is no use of type as a variable in the script, nor is x or i used elsewhere as a variable.

Traceback (most recent call last):
  File "C:/PYTHONprojects/DataDump/log_latest_from_api.py", line 138, in main
    dof = {i: dframe.apply(lambda x: x.str[i - 1] if type(x.iat[0]) is list else x) for i in range(1, 7)}
  File "C:/PYTHONprojects/DataDump/log_latest_from_api.py", line 138, in <dictcomp>
    dof = {i: dframe.apply(lambda x: x.str[i - 1] if type(x.iat[0]) is list else x) for i in range(1, 7)}
  File "C:\Users\...\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\core\frame.py", line 4061, in apply
    return self._apply_standard(f, axis, reduce=reduce)
  File "C:\Users\...\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\core\frame.py", line 4157, in _apply_standard
    results[i] = func(v)
  File "C:/PYTHONprojects/DataDump/log_latest_from_api.py", line 138, in <lambda>
    dof = {i: dframe.apply(lambda x: x.str[i - 1] if type(x.iat[0]) is list else x) for i in range(1, 7)}
NameError: ("free variable 'type' referenced before assignment in enclosing scope", 'occurred at index duration'

推荐答案

以下是创建此类错误的最小方法:

Here is a minimal way to create such an error:

def foo():
    def bar():
        print(type)

    bar()
    type = 1

foo()

特别是type = 1存在的问题，但仅在尝试使用它的调用bar()之后.因此，尽管您说脚本中没有使用type作为变量"，但我很难相信这一点.脚本中还对type进行了哪些提及?您是否给它分配了一个值，将其定义为函数或类的名称，或在任何地方导入了具有该名称的值?

In particular the problem the presence of type = 1, but only after the call to bar() which tries to use it. So while you say "There is no use of type as a variable in the script" I'm having trouble believing that. What other mentions of type in the script? Have you assigned it a value, defined it as the name of a function or class, or imported a value with that name anywhere?

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