Python元组
元组是Python对象的集合,很像列表。存储在元组中的值序列可以是任何类型,并且它们由整数索引。
元组的值在语法上由“逗号”分隔。虽然没有必要,但更常见的是通过关闭括号中的值序列来定义元组。这有助于更轻松地理解Python元组。
创建一个元组
在Python中,通过放置由“逗号”分隔的值序列来创建元组,可以使用或不使用括号对数据序列进行分组。
注意:不使用括号创建Python元组称为元组打包。
演示在元组中添加元素的Python程序。
Python3
# Creating an empty Tuple
Tuple1 = ()
print("Initial empty Tuple: ")
print(Tuple1)
# Creating a Tuple
# with the use of string
Tuple1 = ('Geeks', 'For')
print("\nTuple with the use of String: ")
print(Tuple1)
# Creating a Tuple with
# the use of list
list1 = [1, 2, 4, 5, 6]
print("\nTuple using List: ")
print(tuple(list1))
# Creating a Tuple
# with the use of built-in function
Tuple1 = tuple('Geeks')
print("\nTuple with the use of function: ")
print(Tuple1)
Python3
# Creating a Tuple
# with Mixed Datatype
Tuple1 = (5, 'Welcome', 7, 'Geeks')
print("\nTuple with Mixed Datatypes: ")
print(Tuple1)
# Creating a Tuple
# with nested tuples
Tuple1 = (0, 1, 2, 3)
Tuple2 = ('python', 'geek')
Tuple3 = (Tuple1, Tuple2)
print("\nTuple with nested tuples: ")
print(Tuple3)
# Creating a Tuple
# with repetition
Tuple1 = ('Geeks',) * 3
print("\nTuple with repetition: ")
print(Tuple1)
# Creating a Tuple
# with the use of loop
Tuple1 = ('Geeks')
n = 5
print("\nTuple with a loop")
for i in range(int(n)):
Tuple1 = (Tuple1,)
print(Tuple1)
Python3
# Accessing Tuple
# with Indexing
Tuple1 = tuple("Geeks")
print("\nFirst element of Tuple: ")
print(Tuple1[0])
# Tuple unpacking
Tuple1 = ("Geeks", "For", "Geeks")
# This line unpack
# values of Tuple1
a, b, c = Tuple1
print("\nValues after unpacking: ")
print(a)
print(b)
print(c)
Python3
# Concatenation of tuples
Tuple1 = (0, 1, 2, 3)
Tuple2 = ('Geeks', 'For', 'Geeks')
Tuple3 = Tuple1 + Tuple2
# Printing first Tuple
print("Tuple 1: ")
print(Tuple1)
# Printing Second Tuple
print("\nTuple2: ")
print(Tuple2)
# Printing Final Tuple
print("\nTuples after Concatenation: ")
print(Tuple3)
Python3
# Slicing of a Tuple
# Slicing of a Tuple
# with Numbers
Tuple1 = tuple('GEEKSFORGEEKS')
# Removing First element
print("Removal of First Element: ")
print(Tuple1[1:])
# Reversing the Tuple
print("\nTuple after sequence of Element is reversed: ")
print(Tuple1[::-1])
# Printing elements of a Range
print("\nPrinting elements between Range 4-9: ")
print(Tuple1[4:9])
Python
# Deleting a Tuple
Tuple1 = (0, 1, 2, 3, 4)
del Tuple1
print(Tuple1)
输出:
Initial empty Tuple:
()
Tuple with the use of String:
('Geeks', 'For')
Tuple using List:
(1, 2, 4, 5, 6)
Tuple with the use of function:
('G', 'e', 'e', 'k', 's')
创建具有混合数据类型的元组。
元组可以包含任意数量的元素和任何数据类型(如字符串、整数、列表等)。元组也可以用单个元素创建,但这有点棘手。括号中只有一个元素是不够的,必须有一个尾随的“逗号”才能使其成为元组。
Python3
# Creating a Tuple
# with Mixed Datatype
Tuple1 = (5, 'Welcome', 7, 'Geeks')
print("\nTuple with Mixed Datatypes: ")
print(Tuple1)
# Creating a Tuple
# with nested tuples
Tuple1 = (0, 1, 2, 3)
Tuple2 = ('python', 'geek')
Tuple3 = (Tuple1, Tuple2)
print("\nTuple with nested tuples: ")
print(Tuple3)
# Creating a Tuple
# with repetition
Tuple1 = ('Geeks',) * 3
print("\nTuple with repetition: ")
print(Tuple1)
# Creating a Tuple
# with the use of loop
Tuple1 = ('Geeks')
n = 5
print("\nTuple with a loop")
for i in range(int(n)):
Tuple1 = (Tuple1,)
print(Tuple1)
输出:
Tuple with Mixed Datatypes:
(5, 'Welcome', 7, 'Geeks')
Tuple with nested tuples:
((0, 1, 2, 3), ('python', 'geek'))
Tuple with repetition:
('Geeks', 'Geeks', 'Geeks')
Tuple with a loop
('Geeks',)
(('Geeks',),)
((('Geeks',),),)
(((('Geeks',),),),)
((((('Geeks',),),),),)
元组的访问
元组是不可变的,通常它们包含一系列异构元素,这些元素通过解包或索引(或者在命名元组的情况下甚至通过属性)访问。列表是可变的,它们的元素通常是同质的,可以通过遍历列表来访问。
注意:在解包元组时,左侧的变量数量应等于给定元组 a 中的值的数量。
Python3
# Accessing Tuple
# with Indexing
Tuple1 = tuple("Geeks")
print("\nFirst element of Tuple: ")
print(Tuple1[0])
# Tuple unpacking
Tuple1 = ("Geeks", "For", "Geeks")
# This line unpack
# values of Tuple1
a, b, c = Tuple1
print("\nValues after unpacking: ")
print(a)
print(b)
print(c)
输出:
First element of Tuple:
G
Values after unpacking:
Geeks
For
Geeks
元组的连接
元组的连接是连接两个或多个元组的过程。连接是通过使用 '+'运算符完成的。元组的连接总是从原始元组的末尾开始。其他算术运算不适用于元组。
注意 -只有相同的数据类型可以与串联组合,如果组合列表和元组会出现错误。
Python3
# Concatenation of tuples
Tuple1 = (0, 1, 2, 3)
Tuple2 = ('Geeks', 'For', 'Geeks')
Tuple3 = Tuple1 + Tuple2
# Printing first Tuple
print("Tuple 1: ")
print(Tuple1)
# Printing Second Tuple
print("\nTuple2: ")
print(Tuple2)
# Printing Final Tuple
print("\nTuples after Concatenation: ")
print(Tuple3)
输出:
Tuple 1:
(0, 1, 2, 3)
Tuple2:
('Geeks', 'For', 'Geeks')
Tuples after Concatenation:
(0, 1, 2, 3, 'Geeks', 'For', 'Geeks')
元组切片
对元组进行切片是为了从元组中获取特定范围或子元素的切片。也可以对列表和数组进行切片。列表中的索引导致获取单个元素,而切片允许获取一组元素。
注意 -负增量值也可用于反转元组的序列。
Python3
# Slicing of a Tuple
# Slicing of a Tuple
# with Numbers
Tuple1 = tuple('GEEKSFORGEEKS')
# Removing First element
print("Removal of First Element: ")
print(Tuple1[1:])
# Reversing the Tuple
print("\nTuple after sequence of Element is reversed: ")
print(Tuple1[::-1])
# Printing elements of a Range
print("\nPrinting elements between Range 4-9: ")
print(Tuple1[4:9])
输出:
Removal of First Element:
('E', 'E', 'K', 'S', 'F', 'O', 'R', 'G', 'E', 'E', 'K', 'S')
Tuple after sequence of Element is reversed:
('S', 'K', 'E', 'E', 'G', 'R', 'O', 'F', 'S', 'K', 'E', 'E', 'G')
Printing elements between Range 4-9:
('S', 'F', 'O', 'R', 'G')
删除元组
元组是不可变的,因此它们不允许删除其中的一部分。使用 del() 方法删除整个元组。
注意 -删除后打印元组会导致错误。
Python
# Deleting a Tuple
Tuple1 = (0, 1, 2, 3, 4)
del Tuple1
print(Tuple1)
Traceback (most recent call last):
File “/home/efa50fd0709dec08434191f32275928a.py”, line 7, in
print(Tuple1)
NameError: name ‘Tuple1’ is not defined
内置方法
Built-in-Method | Description |
---|---|
index( ) | Find in the tuple and returns the index of the given value where it’s available |
count( ) | Returns the frequency of occurrence of a specified value |
内置函数
Built-in Function | Description |
---|---|
all() | Returns true if all element are true or if tuple is empty |
any() | return true if any element of the tuple is true. if tuple is empty, return false |
len() | Returns length of the tuple or size of the tuple |
enumerate() | Returns enumerate object of tuple |
max() | return maximum element of given tuple |
min() | return minimum element of given tuple |
sum() | Sums up the numbers in the tuple |
sorted() | input elements in the tuple and return a new sorted list |
tuple() | Convert an iterable to a tuple. |
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