lesson1Title

lesson2Title

lesson3Title

lesson4Title

lesson5Title

lesson6Title

lesson7Title

lesson8Title

lesson9Title

lesson10Title

lesson11Title

lesson12Title

lesson13Title

lesson14Title

lesson15Title

lesson16Title

lesson17Title

lesson18Title

lesson19Title

pythonIntroStep1Chapter4Title

lesson20Title

lesson21Title

pythonIntroStep1Chapter1Title

pythonIntroStep1Chapter2Title

pythonIntroStep1Chapter3Title

# Get a number input from the user
user_input = input("Please enter a number: ")

try:
    # Attempt to convert the input string to an integer
    number = int(user_input)
    print(f"Entered number: {number}")
except ValueError:
    # Print an error message if the input is not a number
    print("Error: You must enter a valid number.")

# Indicating Invalid Values with ValueError

The `ValueError` exception is raised when an invalid value is used.

<br />

## Situations Where ValueError Occurs

1. *When attempting to convert a non-numeric string to a number*: Trying to convert a string like `'hello'` to a number using `int()` or `float()` functions will result in an error.

2. *When attempting to convert a string representing a decimal number to an integer*: Trying to convert a string such as `'3.14'` with `int()` results in an error.

```python title="Example of ValueError Occurrence"
try:
    number = int("hello")

except ValueError:
    print("Attempted to convert a non-numeric value to a number.")


try:
    number = int("3.14")

except ValueError:
    print("Attempted to convert a string with a decimal to an int() function.")
```

A ValueError exception occurs during an invalid type conversion or incorrect value handling.

A ValueError can occur when trying to convert a non-numeric value to a number.