Converting Strings to Numbers and Vice Versa

Python provides built-in functions to seamlessly convert between strings and numeric data types (integers and floating-point numbers).

Converting Strings to Numbers

·         int() function: Converts a string representing an integer to an integer value.

Python

string_number = "42"

integer_value = int(string_number)

print(integer_value)  # Output: 42

·         float() function: Converts a string representing a floating-point number to a float value.

Python

string_number = "3.14"

float_value = float(string_number)

print(float_value)  # Output: 3.14

Note: The string must represent a valid number for successful conversion. Otherwise, a ValueError will be raised.

Converting Numbers to Strings

·         str() function: Converts a number to a string.

Python

number = 42

string_value = str(number)

print(string_value)  # Output: "42"

Key Points

·         The int(), float(), and str() functions are essential for type conversions.

·         Ensure the string representation is valid for the desired numeric type.

·         Use these conversions when you need to perform arithmetic operations on strings or display numbers as text.

Example:

Python

user_input = input("Enter a number: ")  # Input is always a string

number = int(user_input)

result = number * 2

print("Double the number:", result)