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To merge different formats of strings, we can use string concatenation or string interpolation.

1. String Concatenation: In this method, we use the "+" operator to join two or more strings together. For example:

string1 = "Hello"
string2 = "world"
merged_string = string1 + " " + string2
print(merged_string)  # Output: Hello world

1. String Interpolation: In this method, we use curly braces "{}" and the "format()" method to insert one or more strings into another. For example:

string1 = "Hello"
string2 = "world"
merged_string = "{} {}".format(string1, string2)
print(merged_string)  # Output: Hello world

We can also use f-strings, which provide a more concise and readable way of string interpolation. For example:

string1 = "Hello"
string2 = "world"
merged_string = f"{string1} {string2}"
print(merged_string)  # Output: Hello world

Both methods can be used to merge different formats of strings, including variables, numbers, and special characters.