Python TypeError: non-empty format string passed to object.__format__

bytes objects do not have a __format__ method of their own, so the default from object is used:

>>> bytes.__format__ is object.__format__
True
>>> '{:20}'.format(object())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: non-empty format string passed to object.__format__

It just means that you cannot use anything other than straight up, unformatted unaligned formatting on these. Explicitly convert to a string object (as you did by decoding bytes to str) to get format spec support.

You can make the conversion explicit by using the !s string conversion:

>>> '{!s:20s}'.format(b"Hi")
"b'Hi'               "
>>> '{!s:20s}'.format(object())
'<object object at 0x1100b9080>'

object.__format__ explicitly rejects format strings to avoid implicit string conversions, specifically because formatting instructions are type specific.

Related Posts:

  1. ValueError: cannot switch from manual field specification to automatic field numbering
  2. What is the purpose of dollar sign in this Python3 string formatting expression?
  3. How to use filter, map, and reduce in Python 3
  4. How to open a file using the open with statement
  5. Relative imports – ModuleNotFoundError: No module named x
  6. How to uninstall a package installed with pip install –user
  7. Best way to convert string to bytes in Python 3?
  8. PermissionError: [Errno 13] Permission denied
  9. What is setup.py?
  10. How is Anaconda related to Python?
  11. FileNotFoundError: [WinError 2] The system cannot find the file specified:
  12. How to remove EOFError: EOF when reading a line?
  13. TypeError: cannot unpack non-iterable NoneType object
  14. Is there a ‘foreach’ function in Python 3?
  15. Python inline if statement
  16. What does %s mean in a python format string?
  17. How to copy a dictionary and only edit the copy
  18. How to print like printf in Python3?
  19. Could not find a version that satisfies the requirement tensorflow
  20. TypeError: ‘float’ object not iterable
  21. TypeError: ‘type’ object is not subscriptable when indexing in to a dictionary
  22. Invalid character in identifier
  23. Importing class from another file [duplicate]
  24. csv.Error: iterator should return strings, not bytes
  25. ‘str’ object has no attribute ‘decode’. Python 3 error?
  26. How to find all the indexes of a recurring item in a list?
  27. pandas: merge (join) two data frames on multiple columns
  28. How do you use subprocess.check_output() in Python?
  29. (Help) TypeError: ‘str’ object cannot be interpreted as an integer
  30. Why KeyError: 0
  31. Are dictionaries ordered in Python 3.6+?
  32. TypeError: method() takes 1 positional argument but 2 were given
  33. builtins.TypeError: must be str, not bytes
  34. TypeError: write() argument must be str, not bytes (Python 3 vs Python 2 )
  35. takes 1 positional argument but 2 were given
  36. How can I get a list shape without using numpy?
  37. What’s the difference between %s and %d in Python string formatting?
  38. Python 3 ImportError: No module named ‘ConfigParser’
  39. Why am I getting this syntax error: keyword can’t be an expression
  40. re.search().TypeError: cannot use a string pattern on a bytes-like object
  41. Add Legend to Seaborn point plot
  42. ctypes – Beginner
  43. How can I install Python’s pip3 on my Mac?
  44. How can I flush the output of the print function?
  45. Get ZeroDivisionError: float division in python
  46. Convert hex to binary
  47. TypeError: ‘encoding’ is an invalid keyword argument for this function
  48. What is the Python 3 equivalent of “python -m SimpleHTTPServer”
  49. What does -> mean in Python function definitions?
  50. How do you use subprocess.check_output() in Python?
  51. TypeError(“‘bool’ object is not iterable”,) when trying to return a Boolean
  52. List attributes of an object [duplicate]
  53. ValueError: unsupported pickle protocol: 3, python2 pickle can not load the file dumped by python 3 pickle?
  54. “for line in…” results in UnicodeDecodeError: ‘utf-8’ codec can’t decode byte
  55. How do I format a string using a dictionary in python-3.x?
  56. How to troubleshoot an “AttributeError: __exit__” in multiproccesing in Python?
  57. TypeError: cannot unpack non-iterable NoneType object
  58. Shebang doesn’t work with python3
  59. Type error Unhashable type:set
  60. Python was not found; run without arguments to install from the Microsoft Store, or disable this shortcut from Settings
  61. Python map object is not subscriptable
  62. pythonw.exe or python.exe?
  63. .pyw files in python program
  64. How can I convert a .py to .exe for Python?
  65. Directing print output to a .txt file
  66. Converting a sentence to piglatin in Python
  67. Python Error – TypeError: input expected at most 1 arguments, got 3 [duplicate]
  68. A general tree implementation?
  69. Get a random sample with replacement
  70. NameError: global name ‘unicode’ is not defined – in Python 3
  71. Conda command is not recognized on Windows 10
  72. TypeError: int() argument must be a string, a bytes-like object or a number, not ‘list’
  73. AttributeError: ‘Series’ object has no attribute ‘reshape’
  74. ImportError: No module named ‘django.core.urlresolvers’
  75. How to do a Sigma in python 3
  76. Python 3: Multiply a vector by a matrix without NumPy
  77. How to fix “Can’t find a default Python” error
  78. TypeError: ‘newline’ is an invalid keyword argument for this function
  79. environment variables PYSPARK_PYTHON and PYSPARK_DRIVER_PYTHON
  80. Python: urllib.error.HTTPError: HTTP Error 404: Not Found
  81. Display number with leading zeros
  82. Decode Hex String in Python 3
  83. “This constructor takes no arguments” error in __init__
  84. Printing subscript in python
  85. How to clear Tkinter Canvas?
  86. How to embed image or picture in jupyter notebook, either from a local machine or from a web resource?
  87. Meaning of list[-1] in Python
  88. Tkinter error: Couldn’t recognize data in image file
  89. How to install Openpyxl with pip
  90. How can I count time in Python 3?
  91. What is the correct format to write float value to file in Python
  92. Using strip() to clean up a string
  93. “E: Unable to locate package python3-pip”
  94. Generate a random letter in Python
  95. How to print a specific row of a pandas DataFrame?
  96. Accessing dict_keys element by index in Python3
  97. How to install PyQt4 on Windows using pip?
  98. How to install PyQt4 on Windows using pip?
  99. KeyError: ‘plotly_domain’
  100. TypeError: ‘zip’ object is not subscriptable

Leave a Comment

techhipbettruvabetnorabahisbahis forumutaraftarium24edueduedueduseduedueduseduseduedu