Python 尝试运行 main.py 时出现 ModuleNotFoundError

Question

我是 python 的新手，一直在研究数据验证程序。我正在尝试运行我的 main.py 文件，但出现以下错误。

Traceback (most recent call last):
  File "/Users/user/data_validation/main.py", line 5, in <module>
    from src.compile_csv import combine_csv_files
  File "/Users/user/data_validation/src/compile_csv.py", line 5, in <module>
    from helpers.helper_methods import set_home_path
ModuleNotFoundError: No module named 'helpers'

我正在使用 python 版本 3.94

这是我的文件夹结构

data_validation
       - src
         - files
              validation.csv
              - folder_one
                  combined.csv
              - folder_two
                  combined_two.csv
         - helpers
              helper_methods.py
           compile_csv.py
           mysql.py
           split.py
       main.py

compile_csv.py 和 split.py 都使用了 helpers.helper_methods.py

中的方法

我的 main.py 在运行时抛出错误，如下所示：

import os
import sys
import earthpy as et
from src.mysql import insert_data, output_non_matches
from src.compile_csv import combine_csv_files
from src.split import final_merged_file
from src.helpers.helper_methods import set_home_path, does_file_exist

home_path = et.io.HOME
file_path = home_path, "data_validation", "src", "files"
folder_name = sys.argv[1]


def configure_file_path():
    master_aims_file = os.path.join(
        file_path, "validation.csv")
    output_csv = os.path.join(
        file_path, "output.csv.csv")
    gdpr_file_csv = set_home_path(folder_name + "_output.csv")
    output_csv = does_file_exist(os.path.join(
        file_path, folder_name + "_mismatch_output.csv"))
    return output_csv, master_aims_file, gdpr_file_csv


output_csv, master_aims_file, gdpr_file_csv = configure_file_path()

if __name__ == "__main__":
    print(" Finding names which do not match name in master file")
    if (folder_name == "pd") and (folder_name == "wu"):
        final_merged_file()
    else:
        combine_csv_files()

    insert_failures = insert_data(output_csv, master_aims_file)
    output_failures = output_non_matches(output_csv, gdpr_file_csv)

    if insert_failures or output_failures:
        exit(
            "⚠️ There were errors in finding non-matching data, read above for more info"
        )
    os.remove(os.path.join(home_path, "data_validation", "members_data.db"))
    exit(
        f"✅ mismatches found and have been outputted to {output_csv} in the {folder_name} folder")

根据我在python 3中的理解，我们不需要使用__init__.py，您可以在导入过程中使用.来定义路径，所以我不完全确定我做错了什么。

我正在执行来自 /Users/user/data_validation 的文件并使用以下命令 python main.py pd

Answer 1

您可以尝试设置 PYTHONPATH 变量。查看更多信息 here

Answer 2

就是这样。错误发生在您的 compile_csv.py 文件中。我猜你在那个文件中有 from helpers.helper_methods import blah。但是你需要把它改成

from .helpers.helper_methods import blah
OR
from src.helpers.helper_methods import blah

原因是导入是相对于 cwd 而不是代码所在的文件运行。所以你需要添加相对于 /Users/user/data_validation.

的导入

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