Python — Basic string manipulations (e.g. reversing a string, finding substrings)

Python is a popular programming language known for its ease of use and flexibility. One of the most common tasks in programming is working with strings, which are sequences of characters. In this article, we will explore some basic string manipulations in Python, including reversing a string, finding substrings, and changing case.

Reversing a String

One of the most common string manipulations is reversing a string. To do this in Python, we can use slicing. Slicing is a way to extract a portion of a sequence, such as a string. The syntax for slicing a string is as follows:

string[start:end:step]        

where?start?is the starting index (inclusive),?end?is the ending index (exclusive), and?step?is the step size (optional). To reverse a string, we can set?step?to?-1, which will traverse the string backwards. Here's an example:

string = "hello"
reversed_string = string[::-1]
print(reversed_string)  # Output: olleh        

Finding Substrings

Another common string manipulation is finding substrings, which are sequences of characters within a string. To find a substring in Python, we can use the?in?operator, which returns?True?if the substring is found in the string, and?False?otherwise. Here's an example:

string = "hello world"
substring = "world"
if substring in string:
    print("Substring found")
else:
    print("Substring not found")        

Changing Case

Python provides built-in methods to change the case of a string. The?upper()?method converts all characters in a string to uppercase, while the?lower()?method converts all characters to lowercase. Here's an example:

string = "Hello World"
uppercase_string = string.upper()
lowercase_string = string.lower()
print(uppercase_string)  # Output: HELLO WORLD
print(lowercase_string)  # Output: hello world        

Conclusion

In this article, we have explored some basic string manipulations in Python, including reversing a string, finding substrings, and changing case. These operations are just the tip of the iceberg when it comes to working with strings in Python, but they are essential to any programmer’s toolkit. With practice, you can become proficient in manipulating strings and tackle even more complex problems.

Code —Python-Basic-string-manipulations-eg-reversing-a-string | replit

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