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Unable to read URL

My code is the following, it used to run perfectly for quite a while but suddenly got the error message. Tried other stocks data providers like Google & alpha vantage and got the same error message.
import plotly.graph_objects as go
import plotly.express as px
from datetime import datetime
import numpy as np
!pip install ffn
import ffn
import pandas_datareader.data as web
from pandas.plotting import register_matplotlib_converters
from pylab import *
import pandas as pd
import pandas_profiling
import matplotlib.pyplot as plot
from matplotlib import style
%matplotlib inline
stocks = 'alf,mrin,auud,sncr,ddd,ssnt,seac,ttd'
df = ffn.get(stocks, start='06/18/2021').to_returns().dropna()
print(df.as_format('.2%'))
df = df.apply(pd.to_numeric, errors='coerce').fillna(0)
sums = df.select_dtypes(np.number).sum()
sort_sums = sums.sort_values(ascending = False)
pd.set_option('Display.max_rows', len(stocks))
sharpe = ffn.core.calc_sharpe(df)
sharpe = sharpe.sort_values(ascending = False)
df.append({stocks: sharpe},ignore_index=True)
print(str(sort_sums.as_format('.2%')))
print(sharpe.head(10))
df.shape
I'm using Google Colaboratory
Please run the code and you will see the Error message I'm getting (I can't copy it to here).
Please help & thank you very much in advance!

Unable to read pickle file with pandas

I am using Google Co lab
ValueError: unsupported pickle protocol: 5
python version 3.7.10
Link: https://drive.google.com/folderview?id=1eF1BlfewbRhtgdJySjzU6esefYnr2xAC
import pandas as pd
import datetime
import numpy as np
import matplotlib.pyplot as
plt
from glob import glob
from dateutil.relativedelta.
import relativedelta, TH
import pickle
path =
pd.DataFrame
(glob('/content/drive/MyDrive
/sample_nfo_201920_data/
complete_nfo_data_2019-01-
01.pkl'),columns =
['location'])
path['location']
.iloc[0].split('_')[-1]
.split('.')[0]
path['data_date']=
path['location'].apply(lambda.
x: x.split('_')[-1].split('.')
[0])
path['data_date']=
path['data_date'].
apply(lambda. x:
datetime.datetime.
strptime(x,'%Y-%m-%d'))
path=path.sort_values
(['data_date'])
pd.read_pickle
("/content/drive/MyDrive
/sample_nfo_2019-
20_data/complete_nfo_data_
2019-01-01.pkl")
Error:
ValueError: unsupported pickle protocol:5

Use pckle5 or you can do this all in Python 3.8+.

Plot from mglearn

How can I save plot from mglearn? I tried this code but it does not work.
import numpy as np
import matplotlib.pyplot as plt
import mglearn
from fpdf import FPDF
f = mglearn.plots.plot_knn_classification(n_neighbors=3)
f.savefig("n_neighbors.pdf", bbox_inches='tight')
The error was AttributeError: 'NoneType' object has no attribute 'savefig'.
Thanks

As the mglearn package uses matplotlib.pyplot's plotting mechanics you can use their saving mechanics, like so.
mglearn.plots.plot_knn_classification(n_neighbors=3)
plt.savefig("n_neighbors.pdf", bbox_inches='tight')

from sklearn.neighbors import KNeighborsClassifier
import matplotlib.pyplot as plt
import mglearn.plots
import numpy as np
import mglearn
from fpdf import FPDF
X, y = mglearn.datasets.make_forge()
mglearn.plots.plot_knn_classification(n_neighbors=3)
plt.savefig("n_neighbors.pdf", bbox_inches='tight')
This code work.

python 'DataFrame' object has no attribute 'to_frame'

I am new to python. Just following some sample code
this is the error I get:
'DataFrame' object has no attribute 'to_frame'
import matplotlib.pyplot as plt
import seaborn as sns
import pandas as pd
import numpy as np
import statsmodels
import statsmodels.api as sm
from datetime import datetime
tech_list =['4938.TW','2317.TW']
tickers=['4938.TW','2317.TW']
end= '2014-12-31'
start= '2014-01-01'
print(start)
print (end)
from pandas_datareader import data as pdr
import fix_yahoo_finance as yf
yf.pdr_override(tickers)
data=pdr.get_data_yahoo(tech_list,start,end)
data.to_frame().head(10)
I want to get this
enter image description here

The problem is that your 'data' variable is already a dataframe.
Check with print(type(data))
since it's already a dataframe you can use
print(data.head(10))
to get your result

Importing a Function in Python: ImportError "moduleX has no attribute Y"

I'm attempting to import a function defined in another file into the one I am working in.
The function I'm trying to import is in a file called ParallelEqns.py and looks like:
import sys
import numpy as np
import scipy as sp
import sympy as sym
import matplotlib.pyplot as plt
import os
def ParDeriv(x,p):
derivative = []
for k in range(nS):
test = x[(k-1)%nS]*(x[(k+1)%nS] - x[(k-2)%nS]) - x[(k)%nS] + p
if k == 0:
derivative = test
else:
derivative = np.vstack([derivative, test])
return derivative
The file I'm working in looks like:
import sys
import numpy as np
import scipy as sp
import sympy as sym
import matplotlib.pyplot as plt
import os
from ParallelEqns import ParDeriv
That gives me an error of "cannot import name 'ParDeriv'"
If I change the file to:
import sys
import numpy as np
import scipy as sp
import sympy as sym
import matplotlib.pyplot as plt
import os
import ParallelEqns
ParDeriv = ParallelEqns.ParDeriv
I get an error that says "module 'ParallelEqns' has no attribute 'ParDeriv'"
I've checked that both files are in the same directory. I'm not sure what I'm doing wrong here
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Edit: I've answered my own question by closing everything down and restarting python. It looks like I needed to restart python after creating the ParallelEqns.py file for it to correctly import

It turns out I just needed to restart python as I had created the file that I was trying to import after starting up python. Once I did that it worked out