count nubmer of rows pandas code example

Example 1: pandas count number of rows with value

In [37]:
df = pd.DataFrame({'a':list('abssbab')})
df.groupby('a').count()

Out[37]:

   a
a   
a  2
b  3
s  2

[3 rows x 1 columns]

Example 2: python - count total numeber of row in a dataframe

# Option 1
df.A.count()
# Option 2
df['A'].count()
# Option 3
number_of_rows = len(df) 
# Option 4
df.count()