[Python] How to slice column values in pandas DataFrame

I have a dataframe like this-

element id year month days tmax tmin
0 MX17004 2010 1 d1 NaN NaN
1 MX17004 2010 1 d10 NaN NaN
2 MX17004 2010 1 d11 NaN NaN
3 MX17004 2010 1 d12 NaN NaN
4 MX17004 2010 1 d13 NaN NaN


where I want to further break days column like this

days
1
10
11
12
13


I have tried a couple of ways, but not successful in getting the output.

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