how to use concatenate a fixed string and a variable in Python

Question

I want to include file name \'main.txt\' in the subject for that I am passing file name from command line. but getting error in doing so

python sample.py ma         


        

Answer 1

variable=" Hello..."  
print (variable)  
print("This is the Test File "+variable)  

for integer type ...

variable="  10"  
print (variable)  
print("This is the Test File "+str(variable))