python - Count frequency of a number in a column while equals to text in another column -


this sample csv

roughly looks 5 columns

clipboard:

year  course  modul q1 q2 2015 physics cs1203  4  2  2015 physics cs1203  4  3  2015 physics cs1203  3  1  2015 physics cs1203  4  4  2015 english ir0001  2  5  2015 english ir0001  1  2  2015 english ir0001  3  1  2015 english ir0001  5  3  2015 english ir0001  4  3

code:

df = pd.read_clipboard()

i grouped modules, want count number of 4s in module cs1203. new @ this, sorry in advance if stupid question. appreciate help.

thank you

i think need boolean indexing:

print (df[(df.module == 'cs1203') & (df.q1 == 4)])    year   course  module  q1  q2 0  2015  physics  cs1203   4   2 1  2015  physics  cs1203   4   3 3  2015  physics  cs1203   4   4  print (len(df[(df.module == 'cs1203') & (df.q1 == 4)])) 3

if need count in q columns first use melt:

df = pd.melt(df, id_vars=['year','course','module'], value_name='q')    year   course  module  q1  q2 0  2015  physics  cs1203   4   2 1  2015  physics  cs1203   4   3 2  2015  physics  cs1203   3   1 3  2015  physics  cs1203   4   4 4  2015  english  ir0001   2   5 5  2015  english  ir0001   1   2 6  2015  english  ir0001   3   1 7  2015  english  ir0001   5   3 8  2015  english  ir0001   4   3  print (df[(df.module == 'cs1203') & (df.q == 4)])     year   course  module variable  q 0   2015  physics  cs1203       q1  4 1   2015  physics  cs1203       q1  4 3   2015  physics  cs1203       q1  4 12  2015  physics  cs1203       q2  4  print (len(df[(df.module == 'cs1203') & (df.q == 4)])) 4

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