Converting strings to numbers in Python

Demonstrate how a string can be converted into an int or float data type

In Python, we can convert a string containing a numerical value to an actual number using the built-in functions int() and float(). Using these functions, you can parse strings and return integers or floating-point numbers.

How to convert a string into an integer (int) or a floating-point number (float):

Example: Converting to int:

Code:

# String containing a numerical value
x_str = "256"
# Convert the string to an integer
num_int = int(x_str)
print(num_int, type(num_int))

Output:

256 <class 'int'>

Example: Converting to float

Code:

# String containing a numerical value
f_str = "22.7"
# Convert the string to a floating-point number
f_float = float(f_str)
print(f_float, type(f_float))

Output:

22.7 <class 'float'>

Strings must represent valid numerical representations when converted to numerical values. ValueErrors will be raised if the string contains non-numeric characters or is not a properly formatted number. For example:

Code:

num_str = "Good, Morning!"
try:
    num_int = int(num_str)
except ValueError as e:
    print(f"Error: {e}")

Output:

Error: invalid literal for int() with base 10: 'Good, Morning!'