删除DataFrame的所有最后一个字符串

Question

Here is a column of my dataframe.

I want to select for example for the first image 28g and delete (1 ONZ). how can I do ?

Answer 1

Use replace :

df.serving_size.str.replace('\(.*','')

0     NaN
1    28g 
2    28g 
3    28g
4    35g
5    52g
Name: serving_size, dtype: object

Answer 2

You can extract everything outside of the parentheses:

# original df
>>> df
      serving_size
0              NaN
1     28 g (1 ONZ)
2  28 g (0.25 cup)

>>> df.serving_size.str.extract('(.*)\(.*\)')
0      NaN
1    28 g 
2    28 g 
Name: serving_size, dtype: object

Answer 3

Using split

df.serving_size.str.split('(').str[0]
0    NaN
1    28g
2    28g
Name: serving_size, dtype: object