TypeError: unsupported operand type

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Python

TypeError: unsupported operand type

An operator was applied to operands whose types it does not support together.

What it means

An operator was applied to operands whose types it does not support together.

Likely cause

Combining incompatible types, such as adding a string to an integer or concatenating a list with a string.

How to fix it

Convert operands to a common type first, e.g. 'int(x) + y' or 'str(x) + y'. Print or check 'type()' of each operand to confirm what you actually have.

Other Python errors

ModuleNotFoundError: No module named 'x' Python could not find any installed module matching the name you tried to import. ImportError: cannot import name The module was found, but the specific name you asked to import from it does not exist in it. IndentationError: unexpected indent A line is indented more than the surrounding block allows, so Python cannot parse the structure. TabError: inconsistent use of tabs and spaces A block mixes tabs and spaces for indentation in a way Python cannot resolve unambiguously. SyntaxError: invalid syntax The interpreter hit code that is not valid Python and could not be parsed. NameError: name 'x' is not defined You referenced a name that has not been defined in the current scope. TypeError: object is not callable You tried to call something with () that is not a function or callable. ValueError: invalid literal for int() int() received a string that does not represent a valid base-10 integer. KeyError You looked up a dictionary key that does not exist. IndexError: list index out of range You accessed a list position that is beyond the range of its elements. AttributeError: 'NoneType' object has no attribute You accessed an attribute or method on a value that is None instead of the expected object. TypeError: 'NoneType' object is not subscriptable You used indexing or slicing (e.g. x[0]) on a value that is None. ZeroDivisionError: division by zero A division or modulo operation used zero as the divisor. FileNotFoundError: No such file or directory Python could not find the file or directory at the path you gave. RecursionError: maximum recursion depth exceeded A function called itself too many times and exceeded Python's recursion depth limit. UnicodeDecodeError Bytes could not be decoded into text using the assumed character encoding. UnboundLocalError: local variable referenced before assignment A local variable was read before it was assigned inside the function. IndexError: string index out of range You accessed a character position beyond the length of the string. json.decoder.JSONDecodeError: Expecting value The JSON parser expected a value but the input was empty or not valid JSON. PermissionError: Permission denied The operating system refused the file or directory operation because of insufficient permissions. pip: command not found The shell could not locate a 'pip' executable on your PATH. TypeError: argument of type is not iterable A membership test with 'in' was used on a value that is not iterable. TypeError: string indices must be integers A string was indexed with a non-integer, so Python rejected the subscript.

About Error Code Lookup

The Error Code Lookup is a searchable directory of more than 200 common error messages and codes across 12 categories: HTTP status codes, Windows error codes, browser and network errors, JavaScript, Python, PHP, Node.js and npm, Java, MySQL, Git, Linux shell errors and email/SMTP codes. Every entry is written in plain language for quick troubleshooting.

Each error is explained in three parts: what the message actually means, what usually causes it and concrete steps to fix it. That structure turns a cryptic string like ERR_CONNECTION_REFUSED or 0x80070005 into an actionable checklist instead of a guessing game.

You can filter the list by category, search by code, constant or message fragment, and copy any code with one click. Every error also has its own dedicated page with related errors from the same category, so you can bookmark or share a direct link to the exact fix.

How to use Error Code Lookup

  1. Type the error code or message into the search box — for example 404, ERR_NAME_NOT_RESOLVED or 0x80070005.
  2. Narrow the results with the category filter (HTTP, Windows, JavaScript, MySQL and so on) if the search returns too many entries.
  3. Open the matching entry to read what it means, its likely cause and how to fix it.
  4. Use the copy button to grab the exact code for a bug report or support ticket.
  5. Check the related errors section for other errors from the same category.

Frequently asked questions

It covers 12 categories: HTTP status codes, Windows system errors, browser and network errors, JavaScript, Python, PHP, Node.js and npm, Java, MySQL, Git, Linux shell errors and email/SMTP reply codes — more than 200 entries in total.

Search with fewer words. The shortest unique part works best: just the numeric code (“404”, “0x80070005”) or the constant name (“ERR_NAME_NOT_RESOLVED”) rather than the full sentence your system printed.

Yes. Each entry has a dedicated detail page explaining the meaning, likely cause and fix, plus related errors from the same category. You can bookmark it or send the link directly to a colleague or a support ticket.

The fixes describe the standard, widely accepted resolution for each error. Still, read the likely-cause section first — the same code can have several triggers, and matching the cause to your situation tells you which fix applies.

Yes, it is completely free. You can search, browse the category directory and open as many error detail pages as you need without an account.
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