Concatenate two columns in pandas data frame

In [1]:

import numpy as np
import pandas as pd

In [2]:

parm=np.array(['Blood Pressure','Blood Pressure','Blood Pressure','Sick','Sick','Happy'])
val=np.array(["high","high",'low','No','No','Yes'])
df=pd.DataFrame([parm,val]).T
df.columns=['Parm','Value']
df

Out[2]:

	Parm	Value
0	Blood Pressure	high
1	Blood Pressure	high
2	Blood Pressure	low
3	Sick	No
4	Sick	No
5	Happy	Yes

In [4]:

# Checking data types
df['Concatenated_String']=df['Parm'] + "_" + df['Value']
df

Out[4]:

	Parm	Value	Concatenated_String
0	Blood Pressure	high	Blood Pressure_high
1	Blood Pressure	high	Blood Pressure_high
2	Blood Pressure	low	Blood Pressure_low
3	Sick	No	Sick_No
4	Sick	No	Sick_No
5	Happy	Yes	Happy_Yes