13.2.9 Strings To Integers [2026]

ValueError for non-numeric strings.

The conversion process isn't always smooth. When implementing 13.2.9, you must account for several "edge cases": 13.2.9 Strings To Integers

Are you working in a where you need a more detailed breakdown of these conversion methods? ValueError for non-numeric strings

str = "123" num = int(str) print(num) # Output: 123 str = "123" num = int(str) print(num) #

try: value = int(user_input) except ValueError: print("Please enter a valid whole number.") Use code with caution.

| Do | Don't | |----|-------| | Always validate before conversion | Assume input is clean | | Use exception handling for user input | Ignore NumberFormatException | | Trim whitespace manually if needed | Use casting ( (int) "123" in Java/C#) | | Specify radix for non-base-10 strings | Convert binary strings without radix | | Test edge cases (negative, zero, overflow) | Hardcode conversion logic per use-case |