* 겪고 있는 문제 상황을 최대한 자세하게 작성해주세요.

* 문제 해결을 위해 어떤 시도를 해보았는지 구체적으로 함께 알려주세요.

df 정의 후 정상 작동 되는 것을 확인했습니다. chatGPT에 주가그래프 코드를 요청했는데 오류에 df가 지정되어있지 않다고 나오는 이유가 무엇일까요

!pip install pandas_datareader matplotlib

import pandas_datareader.data as web

import matplotlib.pyplot as plt

from datetime import datetime, timedelta

# 현재 날짜 및 5년 전 날짜 설정

end_date = datetime.now()

start_date = end_date - timedelta(days=5*365)  # 5년 전

# 데브시스터즈의 종목 코드

ticker = '194480.KS'  # 네이버 금융에서의 종목 코드에 .KS 추가

# 주가 데이터 가져오기

try:

    df = web.DataReader(ticker, 'yahoo', start_date, end_date)

except Exception as e:

    print(f"데이터를 가져오는 중 오류가 발생했습니다: {e}")

    exit()

# 주가 그래프 그리기

plt.figure(figsize=(12, 6))

plt.plot(df['Close'], label='Close Price', color='blue')

plt.title('데브시스터즈 주가 (최근 5년)')

plt.xlabel('날짜')

plt.ylabel('주가')

plt.legend()

plt.grid()

plt.show()

Requirement already satisfied: pandas_datareader in /usr/local/lib/python3.10/dist-packages (0.10.0)
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Requirement already satisfied: requests>=2.19.0 in /usr/local/lib/python3.10/dist-packages (from pandas_datareader) (2.31.0)
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데이터를 가져오는 중 오류가 발생했습니다: 'NoneType' object has no attribute 'group'
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-1-ab88deecf90e> in <cell line: 23>()
     21 # 주가 그래프 그리기
     22 plt.figure(figsize=(12, 6))
---> 23 plt.plot(df['Close'], label='Close Price', color='blue')
     24 plt.title('데브시스터즈 주가 (최근 5년)')
     25 plt.xlabel('날짜')

NameError: name 'df' is not defined

<Figure size 1200x600 with 0 Axes>