I have created a dict with predifined keys, where the keys are strings and the values are arrays.
Example:
dict = {
"p1": [1,2,3],
"r1": [1,2,3],
"o1": [1,2,3],
"y1": [1,2,3],
"w1": [1,2,3]
}
Then I have logic to manipulate the values of the value arrays(increase/decrease some of the numbers).
At the end I’m using for cycle to iterate over the dict like that:
[dict[f][1] for f in dict]
In this case I’m not changing the structure and I’m not adding any new elements in the dict.
The question is: Can I be sure that the loop will iterate over the elements in the same order as they were defined initially or I have to specify order to be sure?
1
Can I be sure that the loop will iterate over the elements in the same
order as they were defined initially or I have to specify order to be
sure?
The simplest answer is Yes, according to the documentation below
In Python 3.7 and later:
See Ref docs
Changed in version 3.7: Dictionary order is guaranteed to be insertion
order.
Code tested using pyenv shell 3.7.17
>>> my_dict = {
"p1": [1, 2, 3],
"r1": [4, 5, 6],
"o1": [7, 8, 9],
"y1": [10, 11, 12],
"w1": [13, 14, 15]
}
>>> result = [my_dict[key][1] for key in my_dict]
>>> print(result)
[2, 5, 8, 11, 14]
>>>