파이썬 import pandsa as pd 에러 해결방법

import pandas as pd 에서 에러가 발생함

pi@raspberrypi:~/elebot $ python3 elebot.py 1 2
Traceback (most recent call last):
  File "elebot.py", line 2, in <module>
    import pandas as pd
  File "/home/pi/.local/lib/python3.7/site-packages/pandas/__init__.py", line 17, in <module>
    "Unable to import required dependencies:\n" + "\n".join(missing_dependencies)
ImportError: Unable to import required dependencies:
numpy:

IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!

Importing the numpy C-extensions failed. This error can happen for
many reasons, often due to issues with your setup or how NumPy was
installed.

We have compiled some common reasons and troubleshooting tips at:

    https://numpy.org/devdocs/user/troubleshooting-importerror.html

Please note and check the following:

  * The Python version is: Python3.7 from "/usr/bin/python3"
  * The NumPy version is: "1.21.2"

and make sure that they are the versions you expect.
Please carefully study the documentation linked above for further help.

Original error was: libf77blas.so.3: cannot open shared object file: No such file or directory

pi@raspberrypi:~/elebot $

 

여러방법을 해봤는데 다 안되더니 아래와 같이 하니 해결되었다.

2단계를 해야 한다.

 

1단계

Raspberry Pi

There are sometimes issues reported on Raspberry Pi setups when installing using pip3 install (or pip install). These will typically mention:

libf77blas.so.3: cannot open shared object file: No such file or directory

The solution will be to either:

sudo apt-get install libatlas-base-dev

 

to install the missing libraries expected by the self-compiled NumPy (ATLAS is a possible provider of linear algebra).

Alternatively use the NumPy provided by Raspbian. In which case run:

pip3 uninstall numpy # remove previously installed version 
sudo apt install python3-numpy

 

2단계 : 앞의 에러는 안나지만 다음과 같은 에러 발생

pi@raspberrypi:~/elebot $ python3
Python 3.7.3 (default, Jan 22 2021, 20:04:44)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas as pd
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pi/.local/lib/python3.7/site-packages/pandas/__init__.py", line 22, in <module>
    from pandas.compat import (
  File "/home/pi/.local/lib/python3.7/site-packages/pandas/compat/__init__.py", line 15, in <module>
    from pandas.compat.numpy import (
  File "/home/pi/.local/lib/python3.7/site-packages/pandas/compat/numpy/__init__.py", line 7, in <module>
    from pandas.util.version import Version
  File "/home/pi/.local/lib/python3.7/site-packages/pandas/util/__init__.py", line 1, in <module>
    from pandas.util._decorators import (  # noqa
  File "/home/pi/.local/lib/python3.7/site-packages/pandas/util/_decorators.py", line 14, in <module>
    from pandas._libs.properties import cache_readonly  # noqa
  File "/home/pi/.local/lib/python3.7/site-packages/pandas/_libs/__init__.py", line 13, in <module>
    from pandas._libs.interval import Interval
  File "pandas/_libs/interval.pyx", line 1, in init pandas._libs.interval
ValueError: numpy.ndarray size changed, may indicate binary incompatibility. Expected 44 from C header, got 40 from PyObject
>>>

 

이것에 대한 해결방법은 numpy 버전 이유로 아래와 같이 하면 해결됨

pi@raspberrypi:~/elebot $ pip3 install --upgrade numpy
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting numpy
  Using cached https://www.piwheels.org/simple/numpy/numpy-1.21.2-cp37-cp37m-linux_armv7l.whl
Installing collected packages: numpy
  The scripts f2py, f2py3 and f2py3.7 are installed in '/home/pi/.local/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed numpy-1.21.2
pi@raspberrypi:~/elebot $ python3
Python 3.7.3 (default, Jan 22 2021, 20:04:44)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas as pd
>>>

 

https://numpy.org/devdocs/user/troubleshooting-importerror.html

Troubleshooting ImportError — NumPy v1.22.dev0 Manual

https://stackoverflow.com/questions/66060487/valueerror-numpy-ndarray-size-changed-may-indicate-binary-incompatibility-exp

ValueError: numpy.ndarray size changed, may indicate binary incompatibility. Expected 88 from C header, got 80 from PyObject