Python3.6 运行提示 ImportError: cannot import name 'CONFIG

如下代码：

import os

from utils.file_reader import YamlReader

BASE_PATH = os.path.split(os.path.dirname(os.path.abspath(__file__)))[0]

CONFIG_FILE = os.path.join(BASE_PATH, 'config', 'config.yml')

DATA_PATH = os.path.join(BASE_PATH, 'data')

DRIVER_PATH = os.path.join(BASE_PATH, 'drivers')

LOG_PATH = os.path.join(BASE_PATH, 'log')

REPORT_PATH = os.path.join(BASE_PATH, 'report')

class Config:

    def __init__(self, config = CONFIG_FILE):

        self.config = YamlReader(config).data

    def get(self, element, index=0):

        return self.config[index].get(element)

#coding = UTF-8

import os

import yaml

from xlrd import open_workbook

from config.configg import CONFIG_FILE

class YamlReader:

    def __init__(self, yamlf):

        if os.path.exists(yamlf):    # 判断文件是否存在，如果文件不存在，则提示文件不存在并退出

            self.yamlf = yamlf

        else:

            raise FileNotFoundError('文件不存在')

        self._data = None

    @property

    def data(self):

        # _data只能在本类中调用

        # 如果是第一次调用data，读取yaml文档，否则直接返回之前保存的数据

        if not self._data:

            with open(self.yamlf, 'rb') as f:

                self._data = list(yaml.safe_load_all(f))  # load后是个generator，用list组织成列表

        return self._data

class SheetTypeError(Exception):

    pass

class ExcelReader:

    """

       读取excel文件中的内容。返回list。

       如：

       excel中内容为：

       | A  | B  | C  |

       | A1 | B1 | C1 |

       | A2 | B2 | C2 |

       如果 print(ExcelReader(excel, title_line=True).data)，输出结果：

       [{A: A1, B: B1, C:C1}, {A:A2, B:B2, C:C2}]

       如果 print(ExcelReader(excel, title_line=False).data)，输出结果：

       [[A,B,C], [A1,B1,C1], [A2,B2,C2]]

       可以指定sheet，通过index或者name：

       ExcelReader(excel, sheet=2)

       ExcelReader(excel, sheet='BaiDuTest')

    """

    def __init__(self, excel, sheet=0, title_line=True):

        if os.path.exists(excel):

            self.excel = excel

        else:

            raise FileNotFoundError('excel文件不存在！')

        self.sheet = sheet

        self.title_line = title_line

        self._data = list()

    @property

    def data(self):

        if not self._data:

            workbook = open_workbook(self.excel)

            if type(self.sheet) not in [int, str]:

                raise SheetTypeError('Please pass in <type int> or <type str>, not {0}'.format(type(self.sheet)))

            elif type(self.sheet) == int:

                s = workbook.sheet_by_index(self.sheet)

            if self.title_line:

                title = s.row_values(0)  # 首行为title

                for col in range(1, s.nrows):

                    # 依次遍历其余行，与首行组成dict，拼到self._data中

                    self._data.append(dict(zip(title, s.row_values(col))))

            else:

                for col in range(0, s.nrows):

                    # 遍历所有行，拼到self._data中

                    self._data.append(s.row_values(col))

        return self._data

if __name__ == '__main__':

    y = CONFIG_FILE

    reader = YamlReader(y)

    print(reader.data)

    def __init__(self, excel, sheet=0, title_line=True):

        if os.path.exists(excel):

            self.excel = excel

        else:

            raise FileNotFoundError('excel文件不存在！')

        self.sheet = sheet

        self.title_line = title_line

        self._data = list()

    @property

    def data(self):

        if not self._data:

            workbook = open_workbook(self.excel)

            if type(self.sheet) not in [int, str]:

                raise SheetTypeError('Please pass in <type int> or <type str>, not {0}'.format(type(self.sheet)))

            elif type(self.sheet) == int:

                s = workbook.sheet_by_index(self.sheet)

            if self.title_line:

                title = s.row_values(0)  # 首行为title

                for col in range(1, s.nrows):

                    # 依次遍历其余行，与首行组成dict，拼到self._data中

                    self._data.append(dict(zip(title, s.row_values(col))))

            else:

                for col in range(0, s.nrows):

                    # 遍历所有行，拼到self._data中

                    self._data.append(s.row_values(col))

        return self._data

if __name__ == '__main__':

    y = CONFIG_FILE

    reader = YamlReader(y)

    print(reader.data)

第二段代码运行时提示ImportError: cannot import name 'CONFIG_FILE'

在网上查了不少资料，最终确定是因为循环导入的原因，只要推迟进口就解决了，第二段代码修改如下：

#coding = UTF-8

import os

import yaml

from xlrd import open_workbook

class YamlReader:

 ... ...

if __name__ == '__main__':

    from config.configg import CONFIG_FILE     # 由最上面导入挪到此处就可以了

    y = CONFIG_FILE

    reader = YamlReader(y)

    print(reader.data)

参考资料：https://stackoverflow.com/questions/1556387/circular-import-dependency-in-python

代码参考：http://blog.csdn.net/huilan_same/article/details/76572466

巴特西

Python3.6 运行提示 ImportError: cannot import name 'CONFIG_FILE'

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