Variable Naming and Assignment Issues
Understanding how to name and assign variables correctly in Python is essential for writing error-free code. Python enforces specific rules for variable names:
- Variable names must begin with a letter (a–z, A–Z) or an underscore (
_); - You can use letters, digits (0–9), or underscores after the first character;
- Variable names are case sensitive, so
Variable,variable, andVARIABLEare considered three different identifiers; - You cannot use Python's reserved keywords—such as
for,if,else, orclass—as variable names, since these words are part of the language syntax and have predefined meanings.
Following these rules helps you avoid common errors and keeps your code clear and maintainable.
123456# Using a reserved keyword as a variable name for = 10 # This will cause a SyntaxError # Typo in variable name leads to NameError number = 5 print(nmuber) # NameError: name 'nmuber' is not defined
When you assign a value to a variable in Python, the name you choose must follow the naming rules. If you attempt to use a reserved keyword, such as for, Python immediately raises a SyntaxError and will not run your code. Typos are another common source of errors: if you mistype a variable name when referencing it, Python raises a NameError because it cannot find a variable with that exact name. These mistakes can be subtle and frustrating, especially in longer scripts, so always double-check your spelling and avoid using reserved words as variable names.
1. Which of the following are valid variable names in Python?
2. Fill in the blank in the function below with a valid variable name that is not a reserved keyword.
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What are some examples of valid and invalid variable names in Python?
How can I check if a word is a reserved keyword in Python?
Can you explain more about case sensitivity in variable names?
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Understanding how to name and assign variables correctly in Python is essential for writing error-free code. Python enforces specific rules for variable names:
- Variable names must begin with a letter (a–z, A–Z) or an underscore (
_); - You can use letters, digits (0–9), or underscores after the first character;
- Variable names are case sensitive, so
Variable,variable, andVARIABLEare considered three different identifiers; - You cannot use Python's reserved keywords—such as
for,if,else, orclass—as variable names, since these words are part of the language syntax and have predefined meanings.
Following these rules helps you avoid common errors and keeps your code clear and maintainable.
123456# Using a reserved keyword as a variable name for = 10 # This will cause a SyntaxError # Typo in variable name leads to NameError number = 5 print(nmuber) # NameError: name 'nmuber' is not defined
When you assign a value to a variable in Python, the name you choose must follow the naming rules. If you attempt to use a reserved keyword, such as for, Python immediately raises a SyntaxError and will not run your code. Typos are another common source of errors: if you mistype a variable name when referencing it, Python raises a NameError because it cannot find a variable with that exact name. These mistakes can be subtle and frustrating, especially in longer scripts, so always double-check your spelling and avoid using reserved words as variable names.
1. Which of the following are valid variable names in Python?
2. Fill in the blank in the function below with a valid variable name that is not a reserved keyword.
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