how to sort columns alphabetically in pandas code example

Example 1: how to sort columns alphabetically in pandas

df = df.reindex(sorted(df.columns), axis=1)

Example 2: pandas sort dataframe alphabetically by column

dict_ = {
'C':[1,2,3,4],
'B':[2,4,5,8],
'A':[7,5,7,8],
'D':[1,7,8,7]
}

from pandas import DataFrame
df = DataFrame(dict_)
#unorder columns
df
	C	B	A	D
0	1	2	7	1
1	2	4	5	7
2	3	5	7	8
3	4	8	8	7
#only follow from this line when have existing dataframe.
col = df.columns
col = list(col)
['C', 'B', 'A', 'D'] #unorder column 

col.sort()
df = df[col]
df
#ordred columns.
	A	B	C	D
0	7	2	1	1
1	5	4	2	7
2	7	5	3	8
3	8	8	4	7