In Python, you can convert a string to a number using various built-in functions and methods. Here are some commonly used methods for string-to-number conversion:

int(): The int() function is used to convert a string to an integer. It takes a string as input and returns an integer representation of that string if it represents a valid integer. For example:

num_str = “10”
num_int = int(num_str)
print(num_int) # Output: 10

float(): The float() function is used to convert a string to a floating-point number. It takes a string as input and returns a floating-point representation of that string if it represents a valid float. For example:

num_str = “3.14”
num_float = float(num_str)
print(num_float) # Output: 3.14

eval(): The eval() function can evaluate a string as a Python expression and return the result. It can handle complex expressions and supports both integer and floating-point conversion. However, caution should be exercised when using eval() as it can execute arbitrary code if the input is not trusted. For example:

num_str = “5 + 3.2”
result = eval(num_str)
print(result) # Output: 8.2

These methods allow you to convert strings to numbers, whether they represent integers or floating-point values. It’s important to ensure that the string you are converting is a valid representation of a number, as conversion errors may occur if the string cannot be interpreted as a number.