python - count number of occurence in a column
print df
col1 education
0 a 9th
1 b 9th
2 c 8th
len(df[df['education'] == '9th'])python - count number of occurence in a column
print df
col1 education
0 a 9th
1 b 9th
2 c 8th
len(df[df['education'] == '9th'])python - count number of values without dupicalte in a second column values
ID, domain
123, 'vk.com'
123, 'vk.com'
123, 'twitter.com'
456, 'vk.com'
456, 'facebook.com'
456, 'vk.com'
456, 'google.com'
789, 'twitter.com'
789, 'vk.com'
df = df.groupby('domain')['ID'].nunique()
print (df)
domain
'facebook.com' 1
'google.com' 1
'twitter.com' 2
'vk.com' 3Copyright © 2021 Codeinu
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