Remove opening and closing parenthesis with word in pandas

Question

Given a data frame:

df = 

                         multi
0 MULTIPOLYGON(((3 11, 2 33)))
1 MULTIPOLYGON(((4 22, 5 66)))

I was trying to remov

Answer 1

You can use df.column.str in the following way.

df['a'] = df['a'].str.findall(r'[0-9.]+')
df = pd.DataFrame(df['a'].tolist())
print(df)

output:

     0     1
0  3.49  11.10
1  4.49  22.12

This will work for any number of columns. But in the end you have to name those columns.

df.columns = ['a'+str(i) for i in range(df.shape[1])]

This method will work even when some rows have different number of numerical values. like

df =pd.DataFrame({'a':['MULTIPOLYGON(((3.49)))' ,'MULTIPOLYGON(((4.49 22.12)))']})

     a
 0  MULTIPOLYGON(((3.49)))
 1  MULTIPOLYGON(((4.49 22.12)))

So the expected output is

      0     1
0   3.49    None
1   4.49    22.12

After naming the columns using,

df.columns = ['a'+str(i) for i in range(df.shape[1])]

You get,

      a0    a1
0   3.49    None
1   4.49    22.12