Invalid Variable Name In Python | Python 4 You | Lecture 14
In Python, variable names must adhere to specific rules and conventions to be considered valid. Failing to follow these rules and conventions will result in a syntax error or an invalid variable name. Here are the key guidelines and examples of invalid variable names in Python:
1. Valid Characters:
Variable names can contain letters (both uppercase and lowercase), digits (0-9), and underscores (_).
Variable names must start with a letter (a-z or A-Z) or an underscore (_).
2. Reserved Words:
Variable names cannot be the same as Python's reserved words or keywords, such as if, else, for, while, class, def, import, and many more.
3. Case Sensitivity:
Python is case-sensitive, so variable names like myVar and myvar are considered different.
4. No Special Characters:
Special characters like spaces, hyphens, and punctuation marks are not allowed in variable names. Only underscores (_) are permitted.
5. No Starting with Digits:
Variable names cannot start with a digit (0-9). For example, 3rdPlace is an invalid variable name.
Examples of Invalid Variable Names:
Here are some examples of invalid variable names in Python:
Invalid Characters:
my-variable = 42 # Contains a hyphen
first name = "Alice" # Contains a space
my@var = 10 # Contains a special character (@)
Starting with a Digit:
123variable = "Invalid" # Starts with a digit
Using Reserved Words:
for = 5 # Uses a reserved word 'for'
if = True # Uses a reserved word 'if'
Case Sensitivity:
MyVar = 100
myvar = 200
To summarize, valid variable names in Python must consist of letters, digits, and underscores, start with a letter or underscore, and not use reserved words or special characters. Adhering to these rules ensures that your variable names are valid and your Python code runs without syntax errors.
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