how to sort dataframe based on particular (string)columns using python pandas?

python python-2.7 sorting pandas dataframe

31,321

You can first extract digits and cast to int by astype. Then sort_values of column sort and last drop this column:

df['sort'] = df['product'].str.extract('(\d+)', expand=False).astype(int)
df.sort_values('sort',inplace=True, ascending=False)
df = df.drop('sort', axis=1)
print (df)
  product  values
2     a10      15
5      a6      67
1      a5      20
4      a3      12
3      a2      45
0      a1      10

It is necessary, because if use only sort_values:

df.sort_values('product',inplace=True, ascending=False)
print (df)
  product  values
5      a6      67
1      a5      20
4      a3      12
3      a2      45
2     a10      15
0      a1      10

Another idea is use natsort library:

from natsort import index_natsorted, order_by_index

df = df.reindex(index=order_by_index(df.index, index_natsorted(df['product'], reverse=True)))
print (df)
  product  values
2     a10      15
5      a6      67
1      a5      20
4      a3      12
3      a2      45
0      a1      10

31,321

Author by

Sai Rajesh

Updated on July 09, 2022

Comments

Sai Rajesh almost 2 years
My Pandas data frame contains the following data:
```
product,values
 a1,     10
 a5,     20
 a10,    15
 a2,     45
 a3,     12
 a6,     67
```
I have to sort this data frame based on the product column. Thus, I would like to get the following output:
```
product,values
 a10,     15
 a6,      67
 a5,      20
 a3,      12
 a2,      45
 a1,      10
```
Unfortunately, I'm facing the following error:

ErrorDuringImport(path, sys.exc_info())

ErrorDuringImport: problem in views - type 'exceptions.Indentation
Sai Rajesh almost 8 years

i m using python 2.7 version
jezrael almost 8 years

I think copy text of error, under tags in question give edit and paste text under text of question. Thanks.
Sai Rajesh almost 8 years

k now i will add that
jezrael almost 8 years

It looks like your pandas is broken - see link.
Sai Rajesh almost 8 years

what i have do now?
jezrael almost 8 years

Do you use anaconda?
Sai Rajesh almost 8 years

and python 2.7 version
Sai Rajesh almost 8 years

give me one solution
jezrael almost 8 years

maybe help try update pandas - if use windows - in command line use conda update pandas
Sai Rajesh almost 8 years

i m not able to do that..because that anoconda inbuilt in our product
jezrael almost 8 years

phoooo, so it is bigger problem. One idea - maybe if use lower version of pandas, try remove , expand=False from first row of code. What is version of pandas? print pd.versions()
Sai Rajesh almost 8 years

hm k...i will try that
jezrael almost 8 years

Super Ia am glad it working. Thank you for accepting. You can upvote too.
Sai Rajesh almost 8 years

how to add d in all rows?
Sai Rajesh almost 8 years

i mean my column contains 1,2,3,4,5 but i have to change d1,d2,d3,d4,d5
jezrael almost 8 years

use list comprehension - df.columns = ['d' + str(col) for col in df.columns]