What is the syntax rule for having trailing commas in tuple definitions?

by

It is only required for single-item tuples to disambiguate defining a tuple or an expression surrounded by parentheses.

(1)  # the number 1 (the parentheses are wrapping the expression `1`)
(1,) # a 1-tuple holding a number 1

For more than one item, it is no longer necessary since it is perfectly clear it is a tuple. However, the trailing comma is allowed to make defining them using multiple lines easier. You could add to the end or rearrange items without breaking the syntax because you left out a comma on accident.

e.g.,

someBigTuple = (
                   0,
                   1,
                   2,
                   3,
                   4,
                   5,
                   6,
                   7,
                   8,
                   9,
                   10,
                   #...
                   10000000000,
               )

Note that this applies to other collections (e.g., lists and dictionaries) too and not just tuples.

More Related Contents:

  1. Why does adding a trailing comma after a variable name make it a tuple?
  2. When are parentheses required around a tuple?
  3. Why does adding a trailing comma after an expression create a tuple?
  4. Find partial tuple in list of tuple
  5. What does __all__ mean in Python?
  6. How to merge lists into a list of tuples?
  7. How can I do a line break (line continuation) in Python?
  8. x, = … – is this trailing comma the comma operator?
  9. Can you add new statements to Python’s syntax?
  10. `from … import` vs `import .` [duplicate]
  11. Are tuples more efficient than lists in Python?
  12. Python: access class property from string [duplicate]
  13. How can I split a column of tuples in a Pandas dataframe?
  14. a mutable type inside an immutable container
  15. What is the pythonic way to unpack tuples? [duplicate]
  16. Python element-wise tuple operations like sum
  17. Converting a list of tuples into a dict
  18. How is tuple implemented in CPython?
  19. Find an element in a list of tuples
  20. How to convert list of tuples to multiple lists?
  21. Nested list comprehensions
  22. Why do we need tuples in Python (or any immutable data type)?
  23. What does *tuple and **dict mean in Python? [duplicate]
  24. Is it possible to assign the same value to multiple keys in a dict object at once?
  25. Is there a difference between “pass” and “continue” in a for loop in Python?
  26. Sort a list of tuples depending on two elements [duplicate]
  27. Python Syntax Errors with Python Anywhere
  28. python – get list of tuples first index?
  29. Generate all subsets of size k (containing k elements) in Python
  30. In what case would I use a tuple as a dictionary key? [closed]

Leave a Comment