Tuples Revealed: The Ultimate Guide to Immutable Containers in Python

Tuple is an immutable data structure in python, used to store ordered sequence of data. Similar to lists, tuples can contain a variety of element types, including numbers, strings, lists, and even other tuples. However, unlike lists, tuples cannot be modified.

Create tuple

Use commas to separate elements and enclose them in parentheses, such as:

• my_tuple = (1, "two", 3.14)

Use built-in function
• tuple()

  , such as: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>my_tuple = tuple([1, &quot;two&quot;, 3.14])</pre><div class="contentsignin">Copy after login</div></div>

Immutability

The main feature of tuples is their immutability. Once created, elements in a tuple cannot be modified, added, or removed. This makes tuples ideal for storing data that needs to be protected or as function parameters.

Accessing tuple elements

Use subscripts, such as:

• my_tuple[0] # 返回第一个元素
  my_tuple[-1] # 返回最后一个元素

Use segmentation, such as:

• my_tuple[0:2] # 返回前两个元素
  my_tuple[2:] # 返回从第三个元素开始的所有元素

Operation tuple

Although tuples are immutable, there are still some operations that can be performed on them:

• Splicing (`)

  : Connect two or more tuples, such as:

  <strong>new_tuple = my_tuple + (4, "five")</strong>

• Copy (`)

  : Create a new copy of the tuple, such as:

  <strong>new_tuple = my_tuple[:]</strong>

• Check membership (

  in): Check whether a value is contained in a tuple, such as:

  <strong>if "two" in my_tuple:
  print("Found "two" in the tuple")</strong>

• Iteration

  : Use a for loop or iterator to traverse the elements in the tuple, such as:

  <strong>for element in my_tuple:
  print(element)</strong>

Tuple as function parameter

Tuples are often used as function parameters because they are immutable and help prevent accidental modification. Functions can access elements in a tuple using subscripts or pieces.

Tuple vs. List

Tuples are immutable, while lists are mutable.

• Tuples use parentheses
()
• , while lists use square brackets []. The elements of a tuple can only be accessed through subscripts or segments, while the elements of a list can be modified and added.

Best Practices

Prefer using tuples to store data that needs to be protected or immutable.

• Consider using a list containing tuples as a
container
• for large datasets. Use tuples as function parameters to ensure parameter integrity.
• Avoid storing references to mutable objects in tuples, as this may lead to unexpected modifications.

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