When you concatenate two or more strings into one, this process is called concatenation. 

The + operator in Python does this. It’s as easy as writing two-string literals together to concatenate them. A string can be made to repeat for a defined number of times by using the * operator.

Example: 

str1 = 'Hello'

str2 ='World!'

# using +

print('str1 + str2 = ', str1 + str2)

# using *

print('str1 * 3 =', str1 * 3)

Output: 

str1 + str2 =  HelloWorld!

str1 * 3 = HelloHelloHello

Writing two string literals together also concatenates them like + operator.

If we want to concatenate strings in different lines, we can use parentheses.

>>> # two string literals together

>>> ‘Hello ”World!’

‘Hello World!’

>>> # using parentheses

>>> s = (‘Hello ‘

…      ‘World’)

>>> s

‘Hello World’