pandas sort dataframe alphabetically by column

1dict_ = {
2'C':[1,2,3,4],
3'B':[2,4,5,8],
4'A':[7,5,7,8],
5'D':[1,7,8,7]
6}
7
8from pandas import DataFrame
9df = DataFrame(dict_)
10#unorder columns
11df
12	C	B	A	D
130	1	2	7	1
141	2	4	5	7
152	3	5	7	8
163	4	8	8	7
17#only follow from this line when have existing dataframe.
18col = df.columns
19col = list(col)
20['C', 'B', 'A', 'D'] #unorder column 
21
22col.sort()
23df = df[col]
24df
25#ordred columns.
26	A	B	C	D
270	7	2	1	1
281	5	4	2	7
292	7	5	3	8
303	8	8	4	7
31