What are the string concatenation methods in Python?

There are many string splicing methods in Python. This article will introduce several common methods and provide corresponding code examples. These methods include using the " " notation, using the join() method, using the format() method, and using f-string.

1. Use the " " symbol to splice strings:
   This is the simplest and most direct method. You only need to use the " " symbol to connect the strings to be spliced.
   Code example:

   str1 = "Hello"
   str2 = " world!"
   result = str1 + str2
   print(result)  # 输出：Hello world!

2. Use the join() method to splice strings:
   The join() method inserts a character (string) between specified elements, and Returns a concatenated string. This method is suitable for concatenating multiple strings or character lists.
   Code example:

   str_list = ["Hello", "world!"]
   result = " ".join(str_list)
   print(result)  # 输出：Hello world!

3. Use the format() method to splice strings:
   The format() method is a more flexible string splicing method that can be used to placeholder {} and the format() method to fill the placeholder with content.
   Code example:

   str1 = "Hello"
   str2 = "world!"
   result = "{} {}".format(str1, str2)
   print(result)  # 输出：Hello world!

4. Use f-string to splice strings:
   f-string (also called formatted string literal) is a type introduced in Python 3.6 New string formatting method. Use the f prefix, use the variable directly in the string, and refer to the variable through curly braces {}.
   Code example:

   str1 = "Hello"
   str2 = "world!"
   result = f"{str1} {str2}"
   print(result)  # 输出：Hello world!

Among these methods, using the " " symbol and the join() method are suitable for simple string splicing, while the format() method and f-string are More flexible, supporting more complex string formatting and variable insertion. In practical applications, the appropriate method can be selected according to the specific situation to complete the string splicing task.

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