Handling errors with strings in MicroPython on Raspberry Pi Pico

When working with strings in MicroPython on Raspberry Pi Pico, it is important to handle errors that may occur during string operations. Errors can occur for a variety of reasons, such as invalid input or incorrect syntax. Fortunately, MicroPython provides several built-in mechanisms for handling errors with strings.

One of the most common errors that can occur with strings is a ValueError due to incorrect formatting. For example, if you try to convert a string to a numeric type and the string is not a valid number, a ValueError will be raised. To handle this error, you can use a try–except block:

string = "abc123"
try:
    num = int(string)
    print(num)
except ValueError:
    print("Invalid input, cannot convert to int.")

In this example, the int() function attempts to convert the string "abc123" to an integer. However, since "abc123" is not a valid integer, a ValueError is raised. The try–except block catches the error and prints a helpful message.

Another common error that can occur with strings is an IndexError due to attempting to access an element that does not exist in a string. For example, if you try to access the 10th character of a string that only has 5 characters, an IndexError will be raised. To handle this error, you can use a similar try–except block:

string = "hello"
try:
    char = string[10]
    print(char)
except IndexError:
    print("Index out of range, cannot access character.")

In this example, we attempt to access the 10th character of the string "hello", which does not exist. An IndexError is raised, and the try–except block catches the error and prints a helpful message.

It is also possible to raise your own custom errors when working with strings. For example, you may want to raise an error if a string does not meet certain criteria. To do this, you can use the raise statement:

def process_string(string):
    if len(string) < 5:
        raise ValueError("String must be at least 5 characters long.")
    # do something with the string

In this example, the process_string() function raises a ValueError if the input string is less than 5 characters long. This allows the function to provide useful feedback to the user if the input is invalid.

In summary, handling errors with strings in MicroPython on Raspberry Pi Pico involves using try–except blocks to catch built-in errors, and raising your own custom errors when necessary. By using these mechanisms, you can ensure that your code is robust and handles unexpected situations gracefully.

Handling errors with strings in MicroPython on Raspberry Pi Pico

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