Concatenación de strings de Python

En Python, las strings son arrays de bytes que representan caracteres Unicode. Sin embargo, Python no tiene un tipo de datos de caracteres, un solo carácter es simplemente una string con una longitud de 1. Los corchetes [] se pueden usar para acceder a elementos de la string.
Ejemplo: 
 

# Python program to demonstrate
# strings
 
 
# Assign Welcome string to the variable var1
var1 = "Welcome"
 
# Assign statistics string to the variable var2
var2 = "statistics"
 
# print the result
print(var1)
print(var2)

# Python program to demonstrate
# string concatenation
 
 
# Defining strings
var1 = "Hello "
var2 = "World"
 
# + Operator is used to combine strings
var3 = var1 + var2
print(var3)

# Python program to demonstrate
# string concatenation
 
 
var1 = "Hello"
var2 = "World"
 
# join() method is used to combine the strings
print("".join([var1, var2]))
 
# join() method is used here to combine
# the string with a separator Space(" ")
var3 = " ".join([var1, var2])
 
print(var3)

# Python program to demonstrate
# string concatenation
 
 
var1 = "Hello"
var2 = "World"
 
# % Operator is used here to combine the string
print("% s % s" % (var1, var2))

# Python program to demonstrate
# string concatenation
 
 
var1 = "Hello"
var2 = "World"
 
# format function is used here to
# combine the string
print("{} {}".format(var1, var2))
 
# store the result in another variable
var3 = "{} {}".format(var1, var2)
 
print(var3)

# Python program to demonstrate
# string concatenation
 
var1 = "Hello"
var2 = "World"
 
# , to combine data types with a single whitespace.
print(var1, var2)