[FIXED] pandas python how to count the number of records or rows in a dataframe

Issue

Obviously new to Pandas. How can i simply count the number of records in a dataframe.

I would have thought some thing as simple as this would do it and i can't seem to even find the answer in searches...probably because it is too simple.

cnt = df.count
print cnt

the above code actually just prints the whole df

Solution

Regards to your question... counting one Field? I decided to make it a question, but I hope it helps...

Say I have the following DataFrame

import numpy as np
import pandas as pd

df = pd.DataFrame(np.random.normal(0, 1, (5, 2)), columns=["A", "B"])

You could count a single column by

df.A.count()
#or
df['A'].count()

both evaluate to 5.

The cool thing (or one of many w.r.t. pandas) is that if you have NA values, count takes that into consideration.

So if I did

df['A'][1::2] = np.NAN
df.count()

The result would be

 A    3
 B    5

Answered By - tshauck