Common Python Errors and How to Fix Them
Browse all documented Python errors with detailed explanations, root causes, and step-by-step fixes.
SyntaxError: expected ':', got 'def'
This error occurs when Python expects a colon (:) but instead encounters a different keyword or token, in this case, the…
TypeError: 'NoneType' object is not subscriptable
This error occurs when you're trying to access or manipulate a value that is currently set to 'None'. This can happen wh…
SyntaxError: invalid syntax for a while loop in Python 3.x
A syntax error occurs when Python encounters code that it does not understand. In this case, the error is caused by usin…
SyntaxError: unexpected EOF while parsing
This error occurs when Python encounters the end of the file unexpectedly, indicating that there is a syntax error in th…
TemplateNotFound: The template 'base.html' was not found in the templates direct
This error occurs when Flask is unable to locate a specified template. It is usually caused by a typo in the template na…
psycopg2.errors.InvalidCursorName: cursor is closed
This error occurs when you try to use a cursor object after it has been closed in PostgreSQL using the psycopg2 library.…
TemplateNotFound at /user/profile: Unable to find template 'user_profile.html' i
This error occurs when the Django template engine is unable to find a template file that matches the specified name.…
CursorError: No results found for query: SELECT * FROM users WHERE id = 'non_exi
This error occurs when you try to retrieve data from a database using a SQL query that does not return any results.…
OperationalError: no such table: customers - The database table 'customers' does
This error occurs when the database connection attempts to access a table that does not exist in the database schema.…
TemplateNotFound: templates/main.html (template load error)
This error occurs when a template engine in a Python web framework, such as Flask or Django, cannot find the specified t…
TemplateNotFound: 'base.html' template not found in the templates directory
This error occurs when a templating engine, such as Jinja2, is unable to locate a template file.…
invalid syntax (<string>, line 3) SyntaxError: invalid syntax
This error occurs when Python encounters a line of code that it cannot parse, usually due to a misplaced or missing char…
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