How do you replace a string in python?

Python is a powerful programming language which is widely used for development of various applications and services. It provides a great range of functionalities which makes it an ideal choice for tasks such as string manipulation. One of the most common operations performed on strings is replacing a particular part of the string with another substring. Luckily, Python features various methods and functions which can be used to perform such tasks.

The basic syntax for replacing strings in python is:

string_object.replace("old_substring","new_substring")

For example, let's say we have a string "My name is John Smith," and we want to replace John with Kevin. We can use the above syntax to do this:

string_object = "My name is John Smith"

string_object = string_object.replace("John","Kevin")

print(string_object) // prints "My name is Kevin Smith"

Apart from the basic syntax, there are few more effective ways of performing this task in python using regular expressions and split-join techniques. For example, if you need to replace multiple words with different new words, you can use a regular expression object to search and replace all instances of those words in one go rather than specifying them separately as mentioned above. Furthermore, Split-join technique helps us break down our initial string into parts by splitting it at various points and reassembling them back together by adding the newly required substitution elements within those parts.

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