ErrorNotes

🐍 Python Errors

31 error notes

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pythonintermediate

Fixing 'TypeError: cannot pickle' in Python Multiprocessing

TypeError: cannot pickle '<lambda>' object
pythonmultiprocessingpickleparallel
pythonbeginner

Fix 'TypeError: method() takes 1 positional argument but 2 were given' in Python

TypeError: my_method() takes 1 positional argument but 2 were given
pythonooptypeerrorclass
pythonbeginner

Fix 'error: externally-managed-environment' When Installing Python Packages with pip

error: externally-managed-environment
pythonpiplinuxvirtualenv
pythonbeginner

Fixing 'UnboundLocalError: local variable referenced before assignment' in Python

UnboundLocalError: local variable 'x' referenced before assignment
pythonvariable scopeunboundlocalerrorglobal
pythonbeginner

Solving Python's 'FileNotFoundError: [Errno 2]' Once and For All

FileNotFoundError: [Errno 2] No such file or directory: 'path/to/file.txt'
pythondebuggingpathlibfile-handling
pythonbeginner

Fixing the 'ParserError: Error tokenizing data' in Pandas

pandas.errors.ParserError: Error tokenizing data. C error: Expected 3 fields in line 12, saw 5
pythonpandascsvdata-science
pythonintermediate

Fix OSError: [Errno 24] Too many open files in Python

OSError: [Errno 24] Too many open files
pythonoserrorfile-descriptorresource-limit
pythonintermediate

Fix 'OverflowError: math range error' in Python with math.exp() and Large Numbers

OverflowError: math range error
pythonmathoverflowfloat
pythonintermediate

Fix 'JSONDecodeError: Expecting value: line 1 column 1 (char 0)' in Python

json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
pythonjsonjsondecodeerrorparsing
pythonbeginner

Fixing Python's PermissionError: [Errno 13] Permission Denied

PermissionError: [Errno 13] Permission denied: '/path/to/file'
pythonfile-handlingdevopstroubleshooting
pythonintermediate

Solving the Pandas SettingWithCopyWarning: Why Your DataFrame Updates Fail

SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame
pythonpandasdataframedata-science
pythonbeginner

Fix TypeError: 'NoneType' object is not iterable in Python

TypeError: 'NoneType' object is not iterable
pythontypeerrornoneiteration
pythonbeginner

Fixing Python’s 'ValueError: invalid literal for int() with base 10'

ValueError: invalid literal for int() with base 10: 'abc'
pythonvalueerrordata-cleaningbackend
pythonintermediate

Fixing the Python 'Max retries exceeded' ConnectionError

requests.exceptions.ConnectionError: HTTPSConnectionPool(host='...', port=443): Max retries exceeded with url
pythonrequestsapi-developmentnetworking
pythonintermediate

Stop the Crash: Fixing 'RuntimeError: generator raised StopIteration' in Python 3.7+

RuntimeError: generator raised StopIteration
pythongeneratorstopiterationpep479
pythonintermediate

Fixing 'UnicodeEncodeError: ascii codec can't encode character' in Python

UnicodeEncodeError: 'ascii' codec can't encode character '\u00e9' in position 1: ordinal not in range(128)
pythonunicodeencodingascii
pythonintermediate

Fix subprocess.CalledProcessError: Command Returned Non-Zero Exit Status in Python

subprocess.CalledProcessError: Command '['...']' returned non-zero exit status 1
pythonsubprocessshellprocess
pythonbeginner

Fix 'RuntimeWarning: coroutine was never awaited' in Python async/await

RuntimeWarning: coroutine 'xxx' was never awaited
pythonasynciocoroutineasync
pythonbeginner

Fix RuntimeError: dictionary changed size during iteration in Python

RuntimeError: dictionary changed size during iteration
pythonruntimeerrordictionaryiteration
pythonbeginner

Fix TypeError: unsupported operand type(s) for +: 'int' and 'str' in Python

TypeError: unsupported operand type(s) for +: 'int' and 'str'
pythontypeerrortype-conversiondebugging
pythonintermediate

Fix ImportError: cannot import name from partially initialized module (circular import) in Python

ImportError: cannot import name 'X' from partially initialized module 'Y' (most likely due to a circular import)
pythonimportcircular-importmodule
pythonbeginner

Fix Python UnicodeDecodeError: 'utf-8' codec can't decode byte

UnicodeDecodeError: 'utf-8' codec can't decode byte
pythonunicodeencoding
pythonintermediate

Fix Python MemoryError When Processing Large Data

MemoryError
pythonmemoryperformancelarge-data
pythonbeginner

Fix ssl.SSLCertVerificationError: certificate verify failed in Python HTTPS Requests

ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)
pythonsslrequestshttps
pythonbeginner

Fix Python KeyError: 'key_name' When Accessing a Dictionary

KeyError: 'key_name'
pythonkeyerrordictionary
pythonintermediate

Fix Python RecursionError: maximum recursion depth exceeded

RecursionError: maximum recursion depth exceeded
pythonrecursionsys
pythonbeginner

Fix Python TypeError: 'str' object is not callable

TypeError: 'str' object is not callable
pythontypeerrorfunctionvariable
pythonbeginner

Fix Python ValueError: too many values to unpack (expected 2)

ValueError: too many values to unpack (expected 2)
pythontupleunpackinglist
pythonbeginner

Fix AttributeError: 'NoneType' object has no attribute in Python

AttributeError: 'NoneType' object has no attribute 'split'
pythonattributeerrornonetypedebugging
pythonbeginner

Fix 'IndentationError: expected an indented block' in Python

IndentationError: expected an indented block
pythonindentationsyntax
pythonbeginner

Fix ModuleNotFoundError: No module named 'xxx' in Python

ModuleNotFoundError: No module named 'xxx'
pythonpipimportvirtualenv