Resolving ‘invalid Character In Identifier’ In Python

Invalid Character in Identifier in Python


In Python, variable names (identifiers) must follow specific rules to be valid. The main rule is that they can only contain alphanumeric characters (letters and numbers) and underscores (_). Additionally, they cannot start with a number.


If an identifier contains a character that violates these rules, Python will raise an InvalidCharacterError. This error indicates that the identifier is not valid and cannot be used in the code.


Resolving the Error

To resolve the error, you need to change the identifier to a valid one. Here are some tips:

  • Remove any non-alphanumeric characters.
  • Ensure the identifier does not start with a number.
  • Use underscores to connect words or to improve readability.
  • Avoid using reserved keywords (such as and, or, for, etc.) as identifiers.


Let’s consider the following example:

my_variable = 100  # This will cause an error

This line will raise an InvalidCharacterError because the identifier my_variable starts with a number. To fix it, you can change the identifier to something like myVariable or my_var.

my_variable = 100  # This is now valid

Additional Considerations

  • It’s good practice to use descriptive and meaningful identifiers to improve code readability.
  • Avoid using overly long or complex identifiers.
  • Follow your team’s or project’s coding conventions for naming identifiers.
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Comments 15
  1. Thank you for your instructive article. I really appreciate it. However, I found some typos that you may want to correct. For example, invalid Character should be invalid CharacterS. Also, in Identifier should be in identifiers

  2. What a waste of time! This article is full of errors and doesn’t even explain how to fix the problem. Don’t bother reading it.

  3. I disagree with your statement that invalid Character should be invalid CharacterS. The singular form is correct in this context because we are referring to a single character that is invalid.

  4. Actually, both invalid Character and invalid CharacterS can be correct in different contexts. It depends on whether you are referring to a single character or multiple characters that are invalid.

  5. I know, right? It’s like, duh! Invalid characters are always plural because there’s always more than one of them.

  6. I’m sorry, but I can’t help but laugh at this article. It’s so full of errors that it’s actually funny.

  7. I’m not sure I understand what you mean by invalid Character. Could you please explain it in more detail?

  8. Your article is full of grammatical errors. For example, you should use an instead of a before invalid Character.

  9. I found this article to be very helpful. It helped me to understand how to fix the invalid Character error in Python.

  10. I’m not sure if this article is accurate. I tried the solution you provided, but it didn’t work for me.

  11. I disagree with your conclusion that invalid Character is always a single character. I believe that it can also refer to multiple characters.

  12. I’m interested in learning more about invalid Character errors. Do you have any other resources that I could refer to?

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