Page 197 - Robotics and AI class 10
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tail(n) Returns the last n members of the series. import pandas as pd
If n is not specified then by default the friends =
last five members are displayed. pd.Series(["Rohan","Susan","James",
"Riya","Sumit","Abhinav","Vihaan"]
index[11,22,33,44,55,66,77])
print(friends.tail())
33 James
44 Riya
55 Sumit
66 Abhinav
77 Vihan
dtype: object
count() It counts the total non NaN values in a import pandas as pd
series friends =
pd.Series(["Rohan","Susan","James",
"Riya","Sumit","Abhinav","Vihaan"]
index[11,22,33,44,55,66,77])
print(friends.count())
7
DataFrames
A DataFrame is a two-dimensional labelled heterogeneous data structure that contains rows and columns. It has
both a row and column index. The data arranged in the form of a row and a column resembles the data arranged
in a tabular form in a table of a database.
Creating a DataFrame
• Creating an empty DataFrame
import pandas as pd
Emp = pd.DataFrame() print(Emp)
Empty DataFrame
Columns: []
Index: []
• Creating a DataFrame from Numpy Array
import numpy as np
import pandas as pd
a1 = np.array([10,20,30])
a2 = np.array([11,22,33])
f1=pd.DataFrame(a1)
f2=pd.DataFrame([a1,a2])
print(f1)
print(f2)
0
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Introduction to Data and Programming with Python 195

