To create a Python tuple containing one value, put a comma after the value: one_item = (value,). The comma makes it a tuple; parentheses alone only group an expression.
Write a comma after the value
Use this form for a one-element tuple:
single = ('hello',)
print(single) # ('hello',)Python’s language reference requires a trailing comma when a tuple display has exactly one element. The comma-separated values define the tuple; parentheses are often used to make the tuple’s boundaries clear. See the Python language reference.
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Why (value) is not a tuple
Parentheses by themselves group an expression. So ('hello') evaluates to the string 'hello', while ('hello',) evaluates to a tuple containing that string.
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one_item = ('hello',) # a one-element tupleExamples with different values
The same comma rule applies regardless of the value’s type:
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number = (42,)
text = ('hello',)
flag = (True,)
none_value = (None,)Other tuple forms
()creates an empty tuple.(first, second)creates a tuple with two values. A final comma is optional when there is more than one element.value,is also tuple syntax in a context that accepts a comma-separated expression list, though(value,)makes the intent more obvious.
PEP 8 likewise says that a trailing comma is mandatory for a one-element tuple: When to Use Trailing Commas.
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