Python + JavaScript

SyntaxError: What It Means and How to Fix It

Error reference

SyntaxError

Language

Python + JavaScript

Severity

High

When it happens

A SyntaxError means the interpreter or compiler cannot parse your code because it violates the grammar rules of the language.

Potential fixes

Read the error message: it points to the line and character where the parser got confused. The actual mistake is often one line above. Use an editor with syntax highlighting and linting to catch these issues before running.

Related errors

IndentationError NameError

Deep dive

A SyntaxError means the interpreter or compiler cannot parse your code because it violates the grammar rules of the language. The code is not written in a way the language understands, so it cannot even start running.

Why it happens

•Missing colon at the end of a def, if, for, or while statement (Python).
•Missing or mismatched parentheses, brackets, or braces.
•Using a reserved keyword as a variable name.
•Forgetting a comma between arguments or items in a list.

Potential fixes

Read the error message: it points to the line and character where the parser got confused. The actual mistake is often one line above. Use an editor with syntax highlighting and linting to catch these issues before running.

Examples

Python

Code that triggers the error

def greet(name)
    print("Hello", name)

Error output

  File "app.py", line 1
    def greet(name)
                   ^
SyntaxError: expected ':'

Fixed code

def greet(name):
    print("Hello", name)

greet("Alice")  # Hello Alice

JavaScript

Code that triggers the error

function greet(name) {
  console.log("Hello" name);
}

Error output

SyntaxError: Unexpected identifier 'name'

Fixed code

function greet(name) {
  console.log("Hello", name);
}

greet("Alice");  // Hello Alice

Practice in English

How would you explain a SyntaxError to a fellow dev? Choose the right phrase:

"I hit an error...

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