Davrot: Created page with " == The goal == Tuple are a non-mutable container which is typically used for heterogenic data types and is very important for functions with multiple return values. Questions to [mailto:davrot@uni-bremen.de David Rotermund] == [https://docs.python.org/3/library/stdtypes.html#tuple Tuples] ==
Tuples are immutable sequences, typically used to store collections of heterogeneous data (such as the 2-tuples produced by the enumerate() built-in). Tuples are..."

2025-10-15T13:13:33Z

Created page with " == The goal == Tuple are a non-mutable container which is typically used for heterogenic data types and is very important for functions with multiple return values. Questions to [mailto:davrot@uni-bremen.de David Rotermund] == [https://docs.python.org/3/library/stdtypes.html#tuple Tuples] == <blockquote>Tuples are immutable sequences, typically used to store collections of heterogeneous data (such as the 2-tuples produced by the enumerate() built-in). Tuples are..."

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== The goal ==
Tuple are a non-mutable container which is typically used for heterogenic data types and is very important for functions with multiple return values.

Questions to [mailto:davrot@uni-bremen.de David Rotermund]

== [https://docs.python.org/3/library/stdtypes.html#tuple Tuples] ==
<blockquote>Tuples are immutable sequences, typically used to store collections of heterogeneous data (such as the 2-tuples produced by the enumerate() built-in). Tuples are also used for cases where an immutable sequence of homogeneous data is needed (such as allowing storage in a set or dict instance).</blockquote>

= Examples =
A tuple is a list of stuff that is enclosed in '''( )''' and seperated by ''',''' . An optional ''',''' after the last element is allowed.<syntaxhighlight lang="python">a = (
"a",
"b",
"c",
)
print(a)

a = ("a", "b", "c")
print(a)</syntaxhighlight>Output:<syntaxhighlight lang="python">('a', 'b', 'c')
('a', 'b', 'c')</syntaxhighlight>

== Immutable ==
After creating a tuple cannot be modified. They are immutable.<syntaxhighlight lang="python">a = (
"a",
"b",
"c",
)

a[0] = "d" # -> TypeError: 'tuple' object does not support item assignment</syntaxhighlight>But this doesn’t mean that we can not stored mutable objects in a tuple. Furthermore these mutable objects stay mutable.<syntaxhighlight lang="python">a = (
["a"],
"b",
"c",
)

a[0][0] = "d" # Okay, because changes the content of the list stored in a[0]
a[0] = "d" # -> TypeError: 'tuple' object does not support item assignment</syntaxhighlight>

== Indexing ==
Idexing is the same as in lists.<syntaxhighlight lang="python">a = (
"a",
2,
3.3,
)

print(a[0]) # -> a
print(a[1]) # -> 2
print(a[-1]) # -> 3.3
print(a[:1]) # -> ('a',)
print(a[1:]) # -> (2, 3.3)
print(a[::2]) # -> ('a', 3.3)</syntaxhighlight>

== * ==
<syntaxhighlight lang="python">a = (
"a",
2,
3.3,
)

print(a*3)
print(3*a)</syntaxhighlight>Output:<syntaxhighlight lang="python">('a', 2, 3.3, 'a', 2, 3.3, 'a', 2, 3.3)
('a', 2, 3.3, 'a', 2, 3.3, 'a', 2, 3.3)</syntaxhighlight>

== len() ==
<syntaxhighlight lang="python">a = (
"a",
2,
3.3,
)

print(len(a)) # -> 3</syntaxhighlight>

== + ==
<syntaxhighlight lang="python">a = (
"a",
2,
3.3,
)

b = (
"b",
8.8,
5,
)

print(a+b) # -> ('a', 2, 3.3, 'b', 8.8, 5)
print(b+a) # -> ('b', 8.8, 5, 'a', 2, 3.3)</syntaxhighlight>

== in ==
<syntaxhighlight lang="python">a = (
"a",
2,
3.3,
)

print(2 in a) # -> True
print(2 not in a) # -> False</syntaxhighlight>

== index() ==
<syntaxhighlight lang="python">a = (
"a",
2,
3.3,
)

print(a.index(2)) # -> 1
print(a.index("a")) # -> 0</syntaxhighlight>

== count() ==
<syntaxhighlight lang="python">a = (
"a",
2,
3.3,
"a",
2,
2,
)

print(a.count(2)) # -> 3
print(a.count("a")) # -> 2 </syntaxhighlight>

== min() and max() ==
<syntaxhighlight lang="python">a = (
9,
2,
3.3,
22,
2,
2,
)

print(min(a)) # -> 2
print(max(a)) # -> 22</syntaxhighlight>Strings are not allowed<syntaxhighlight lang="python">a = (
"a",
2,
3.3,
"a",
2,
2,
)

print(min(a))
print(max(a))</syntaxhighlight>Output:<syntaxhighlight lang="python">TypeError: '<' not supported between instances of 'int' and 'str'</syntaxhighlight>

== [https://docs.python.org/3/library/stdtypes.html#sequence-types-list-tuple-range Common Sequence Operations] ==
{| class="wikitable"
!Operation
!Result
|-
|x in s
|True if an item of s is equal to x, else False
|-
|x not in s
|False if an item of s is equal to x, else True
|-
|s + t
|the concatenation of s and t
|-
|s * n or n * s
|equivalent to adding s to itself n times
|-
|s[i]
|ith item of s, origin 0
|-
|s[i:j]
|slice of s from i to j
|-
|s[i:j:k]
|slice of s from i to j with step k
|-
|len(s)
|length of s
|-
|min(s)
|smallest item of s
|-
|max(s)
|largest item of s
|-
|s.index(x[, i[, j]])
|index of the first occurrence of x in s (at or after index i and before index j)
|-
|s.count(x)
|total number of occurrences of x in s
|}

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