Pandas dict to dataframe - columns out of order?

Question

I did a search but didn\'t see any results pertaining to this specific question. I have a Python dict, and am converting my dict to a pandas dataframe:

panda         


        

Answer 1

Python dictionaries (pre 3.6) are unordered so the column order can not be relied upon. You can simply set the column order afterwards.

In [1]:

df = pd.DataFrame({'a':np.random.rand(5),'b':np.random.randn(5)})
df
Out[1]:
          a         b
0  0.512103 -0.102990
1  0.762545 -0.037441
2  0.034237  1.343115
3  0.667295 -0.814033
4  0.372182  0.810172
In [2]:

df = df[['b','a']]
df
Out[2]:
          b         a
0 -0.102990  0.512103
1 -0.037441  0.762545
2  1.343115  0.034237
3 -0.814033  0.667295
4  0.810172  0.372182