python - What is a tuple useful for? - Stack Overflow
2014年9月9日 · Whereas mixing different types of data inside the same tuple is the whole point of tuples. Fields in a tuple are usually of different types (but not always - e.g. you could have a (Float, Float, Float) tuple to represent x,y,z coordinates). Tuples and lists are often nested. It's common to have a list of tuples.
What's the difference between lists and tuples? - Stack Overflow
2009年3月9日 · The PEP 484 -- Type Hints says that the types of elements of a tuple can be individually typed; so that you can say Tuple[str, int, float]; but a list, with List typing class can take only one type parameter: List[str], which hints that the difference of the 2 really is that the former is heterogeneous, whereas the latter intrinsically homogeneous.
python - Add another tuple to a tuple of tuples - Stack Overflow
Build another tuple-of-tuples out of another_choice, then concatenate: final_choices = (another_choice,) + my_choices Alternately, consider making my_choices a list-of-tuples instead of a tuple-of-tuples by using square brackets instead of parenthesis:
How does tuple comparison work in Python? - Stack Overflow
Tuples are compared position by position: the first item of the first tuple is compared to the first item of the second tuple; if they are not equal (i.e. the first is greater or smaller than the second) then that's the result of the comparison, else the second item is considered, then the third and so on. See Common Sequence Operations:
What does the term "Tuple" Mean in Relational Databases?
2009年4月15日 · A tuple is used to define a slice of data from a cube; it is composed of an ordered collection of one member from one or more dimensions. A tuple is used to identify specific sections of multidimensional data from a cube; a tuple composed of one member from each dimension in a cube completely describes a cell value.
types - What are "named tuples" in Python? - Stack Overflow
2010年6月4日 · It's a specific subclass of a tuple that is programmatically created to your specification, with named fields and a fixed length. This, for example, creates a subclass of tuple, and aside from being of fixed length (in this case, three), it can be used everywhere a tuple is used without breaking. This is known as Liskov substitutability.
python - Convert numpy array to tuple - Stack Overflow
2012年4月5日 · Note: This is asking for the reverse of the usual tuple-to-array conversion. I have to pass an argument to a (wrapped c++) function as a nested tuple. For example, the following works X = MyFunc...
parsing - Python casting Tuple [int, int] - Stack Overflow
2019年4月19日 · I have a string "1,2" that I am trying to parse into (1, 2) without simply splitting based on ,. I was thinking intuitively something along the lines of: from typing import Tuple t = Tuple[int, in...
AttributeError: 'tuple' object has no attribute - Stack Overflow
2014年3月3日 · This is what is called a tuple, obj is associated with 4 values, the values of s1,s2,s3,s4. So, use index as you use in a list to get the value you want, in order. obj=list_benefits() print obj[0] + " is a benefit of functions!" print obj[1] + " is a benefit of functions!" print obj[2] + " is a benefit of functions!"
Type hinting tuples in Python - Stack Overflow
2017年11月28日 · I have this use case where a caller supplies one or two item tuples in a list. There can be any number of tuples in the list but all the tuples are either length one or length two.