Why does Python wrap list elements in tuples?

Question

Python

Python wraps each list element followed by a comma into a tuple.

fio = {},
age = {},
date = {},
diagnoz = {}

columns = [
    fio,
    age,
    date,
    diagnoz,
]
print(columns)

I get this result:
[({},), ({},), ({},), {}]
I'm actually trying to add data to the dictionaries in a loop. But due to the fact that each element of the dictionary is wrapped in a tuple, I cannot do this and get an error:

TypeError: 'tuple' object does not support item assignment

Answer 1

No commas are needed in the first three lines.
A newline is already a sufficient instruction separator.
A comma is not used to separate instructions, only to separate elements in different sequences. It should be used inside brackets (either round, or square, or curly). If you use a comma without parentheses, then the interpreter assumes parentheses (i.e., a tuple) are implied.
Those. you need to write like this:
fio = {}
age = {}
date = {}
diagnoz = {}
By the way, the diagnoz variable - are you writing some kind of medical system? I just work in a medical center myself :))

Answer 2

Because the record

x = ('string',)
y = (1,)

Equivalent

x = 'string',
y = 1,

Answer 3

Thanks to all.
I copied these lines from the list, but did not pay attention to the commas.