Get last "column" after .str.split() operation on column in pandas DataFrame


Question

I have a column in a pandas DataFrame that I would like to split on a single space. The splitting is simple enough with DataFrame.str.split(' '), but I can't make a new column from the last entry. When I .str.split() the column I get a list of arrays and I don't know how to manipulate this to get a new column for my DataFrame.

Here is an example. Each entry in the column contains 'symbol data price' and I would like to split off the price (and eventually remove the "p"... or "c" in half the cases).

import pandas as pd
temp = pd.DataFrame({'ticker' : ['spx 5/25/2001 p500', 'spx 5/25/2001 p600', 'spx 5/25/2001 p700']})
temp2 = temp.ticker.str.split(' ')

which yields

0    ['spx', '5/25/2001', 'p500']
1    ['spx', '5/25/2001', 'p600']
2    ['spx', '5/25/2001', 'p700']

But temp2[0] just gives one list entry's array and temp2[:][-1] fails. How can I convert the last entry in each array to a new column? Thanks!

1
43
9/21/2015 6:06:26 PM

Accepted Answer

You could use the tolist method as an intermediary:

In [99]: import pandas as pd

In [100]: d1 = pd.DataFrame({'ticker' : ['spx 5/25/2001 p500', 'spx 5/25/2001 p600', 'spx 5/25/2001 p700']})

In [101]: d1.ticker.str.split().tolist()
Out[101]: 
[['spx', '5/25/2001', 'p500'],
 ['spx', '5/25/2001', 'p600'],
 ['spx', '5/25/2001', 'p700']]

From which you could make a new DataFrame:

In [102]: d2 = pd.DataFrame(d1.ticker.str.split().tolist(), 
   .....:                   columns="symbol date price".split())

In [103]: d2
Out[103]: 
  symbol       date price
0    spx  5/25/2001  p500
1    spx  5/25/2001  p600
2    spx  5/25/2001  p700

For good measure, you could fix the price:

In [104]: d2["price"] = d2["price"].str.replace("p","").astype(float)

In [105]: d2
Out[105]: 
  symbol       date  price
0    spx  5/25/2001    500
1    spx  5/25/2001    600
2    spx  5/25/2001    700

PS: but if you really just want the last column, apply would suffice:

In [113]: temp2.apply(lambda x: x[2])
Out[113]: 
0    p500
1    p600
2    p700
Name: ticker
34
9/20/2012 1:43:43 AM

Do this:

In [43]: temp2.str[-1]
Out[43]: 
0    p500
1    p600
2    p700
Name: ticker

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