# Invalid Literal for Int with Base 10

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118 # Invalid Literal for Int with Base 10

The “invalid literal for int() with base 10” error usually occurs when you are trying to convert a string value to an integer, but the string cannot be interpreted as a valid integer. This can happen for a number of reasons, including:

• The string contains non-numeric characters.
• The string is an empty string.
• The string represents a number that is too large or too small to be represented as an integer.

Here is an example of code that would trigger this error:

```x = "hello" y = int(x) ```

To fix this error, you’ll need to make sure that the string you are trying to convert to an integer is a valid integer representation. Here are a few ways you can do this:

• Use the `isdigit()` method to check if the string contains only digits:
```if x.isdigit(): y = int(x) else: print("The string is not a valid integer") ```
• Use the `try` and `except` statements to handle the exception that is raised when the string cannot be converted to an integer:
```try: y = int(x) except ValueError: print("The string is not a valid integer") ```
• Use regular expressions to check if the string is a valid integer representation:
```import re if re.match(r'^-?\d+\$', x): y = int(x) else: print("The string is not a valid integer") ```

Here are a few more examples of how you can use the techniques I mentioned to handle the “invalid literal for int() with base 10” error:

Example 1: Use the `isdigit()` method to check if the string contains only digits:

```x = "12345" if x.isdigit(): y = int(x) print(y) # 12345 else: print("The string is not a valid integer") x = "12345hello" if x.isdigit(): y = int(x) print(y) else: print("The string is not a valid integer") # The string is not a valid integer ```

Example 2: Use the `try` and `except` statements to handle the exception that is raised when the string cannot be converted to an integer:

```x = "12345" try: y = int(x) print(y) # 12345 except ValueError: print("The string is not a valid integer") x = "12345hello" try: y = int(x) print(y) except ValueError: print("The string is not a valid integer") # The string is not a valid integer ```

Example 3: Use regular expressions to check if the string is a valid integer representation:

```import re x = "12345" if re.match(r'^-?\d+\$', x): y = int(x) print(y) # 12345 else: print("The string is not a valid integer") x = "12345hello" if re.match(r'^-?\d+\$', x): y = int(x) print(y) else: print("The string is not a valid integer") # The string is not a valid integer```