Function Application Continued(applymap)...

Applymap - Apply a function to a Dataframe element wise. This method applies a function that accepts and returns a scalar to every element of a DataFrame.
Example:-

import pandas as pd

import numpy as np

df=pd.DataFrame([[1, 2.12], [3.356, 4.567]])

print(df.applymap(lambda x : len(str(x))))

Output:-

     0   1

0  3    4

1  5    5

Explanation:-

• applymap applies particular function to each element of the dataframe.
• lambda operator is used to create functions without a name.
• x represent each element of dataframe and len(str(x)) is the operation applied on elements
• str function is used to convert integer into string
• len is a function used to calculate the length of the string

Quiz:-

1. import pandas as pd

import numpy as np
df=pd.DataFrame([[1, 2.12], [3.356, 4.567]])print(df.applymap(lambda x: x**2))
#Post your answer in comment

2. import pandas as pd

import numpy as np
def ff(x):
    if x>4:
       x=x*2
       return x
    else:
       return x
df=pd.DataFrame([[1, 2], [3, 4]])
print(df.applymap(lambda x: ff(x)))
#Post your answer in comment