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Error: valueError: ordinal must be >= 1

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  Error: valueError: ordinal must be >= 1 ryguy7272 <ryanshuell@gmail.com> - 2015-07-27 16:13 -0700
    Re: Error: valueError: ordinal must be >= 1 Emile van Sebille <emile@fenx.com> - 2015-07-27 16:25 -0700

#94678 — Error: valueError: ordinal must be >= 1

Hello experts.  I'm working in Python > Anaconda > Spyder.

I'm reading a book called 'Python for Finance' and I'm trying to run this sample code:


import numpy as np
import pandas as pd
import pandas.io.data as web


sp500 = web.DataReader('^GSPC', data_source='yahoo', start='1/1/2000', end='4/14/2014')
sp500.info()

sp500['Close'].plot(grid=True, figsize=(8, 5))

sp500['42d'] = np.round(pd.rolling_mean(sp500['Close'], window=42), 2)
sp500['252d'] = np.round(pd.rolling_mean(sp500['Close'], window=252), 2)

sp500[['Close', '42d', '252d']].tail()

sp500[['Close', '42d', '252d']].plot(grid=True, figsize=(8, 5))

sp500['42-252'] = sp500['42d'] - sp500['252d']
sp500['42-252'].tail()
sp500['42-252'].head()


It seems to work perfectly find when I see the results in the book, but all I'm getting is this . . . 
*** ValueError: ordinal must be >= 1
(Pdb) 

Does anyone have any idea what I'm doing wrong?

Thanks, all.

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#94681

On 7/27/2015 4:13 PM, ryguy7272 wrote:
<SNIP>

> It seems to work perfectly find when I see the results in the book, but all I'm getting is this . . .
> *** ValueError: ordinal must be >= 1
> (Pdb)
>
> Does anyone have any idea what I'm doing wrong?

You've been dropped into the python debugger.  I'd suspect you've hit a 
'import pdb; pdb.set_trace()' or similar line.

You can type in 'l'  (lower case L) to see the context (you may need to 
's' (step) to the appropriate line depending on your version of python.)

Alternately, use 'c' to allow the script to continue processing.

Otherwise, you'll need to complete debugging the code (as indicated by 
the break) or comment out/remove the set_trace.


Emile

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