pandas - splitting at underscore in python and storing the first value -


i have pandas data frame df column construct_name

construct_name aaaa_t1_2     cccc_t4_10 bbbb_g3_3

and on. want first split names @ underscore , store first element (aaaa,cccc, etc.) column name.

expected output

construct_name  name aaaa_t1_2       aaaa cccc_t4_10      bbbb

and on.

i tried following df['construct_name'].map(lambda row:row.split("_")) , gives me list like

[aaaa,t1,2] [cccc,t4,10]

and on

but when

df['construct_name'].map(lambda row:row.split("_"))[0] first element of list error. can suggest fix. thanks

just use vectorised str method split , use integer indexing on list first element:

in [228]:  df['first'] = df['construct_name'].str.split('_').str[0] df out[228]:   construct_name first 0      aaaa_t1_2  aaaa 1     cccc_t4_10  cccc 2      bbbb_g3_3  bbbb

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