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How to unpack Python sequence tutorials, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

Python sequence has a wide range of applications, but there are still many problems to be solved in practical applications. Let's take a look at how to solve the related problems. I hope it will be helpful in the future work.

Python sequences (strings, lists, tuples)

The * elements of the Python sequence start at 0 and can be accessed not only from the beginning but also from the tail. * * one element is a [- 1], the second to the last is a [- 2], and the last I is a [- I].

List creation, traversal, modification, etc., lists can store different types of elements, it is customary to use lists to store pass-type data. The length can be modified at runtime.

Tuples, which usually store sequences of heterogeneous data, are also customary and irregular. If the length is determined in advance, it cannot be changed during the execution of the program. The creation of a tuple can be accessed:

AList = [] for number in range (1,11): aList + = [number]

Print "The value of aList is:", aList for item in aList: print item

Print for i in range (len (aList)): print "9d 7d"%

(I, aList [I]) aList [0] =-100aList [- 3] = 19print "Value of aList after modification:", aList

7.3.

Hour = 2

Minute = 12

Second = 34

CurrentTime = hour, minute, second # create tuple

Print "The value of currentTime is:", currentTime

Unpacking of Python sequence

Atupe= creates tuples, called "tuple packaging", because values are "packaged into tuples" and tuples and other sequences can be "unpacked" to assign values stored in the sequence to individual identifiers. Example:

# create sequencesaString = "abc" aList = [1,2,3]

ATuple = "a", "A"

# unpack sequences to variablesprint "Unpacking string..."

First, second, third = aStringprint "String values:", first

Second, third print "\ nUnpacking list..." first, second

Third = aListprint "List values:", first, second, third

Print "\ nUnpacking tuple..." first, second, third = aTupleprint

"Tuple values:", first, second, third

# swapping two valuesx = 3y = 4 print "\ nBefore

Swapping: X =% d, y =% d "% (x, y) x, yy = y, x # swap varia

Blesprint "After swapping: X =% d, y =% d"% (x, y)

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