Tuple methods in python
Python supports various compound datatypes like String, tuple,dictionary etc.
In previous post we studied about what are tuples? and tuple operations
A Tuple is a collection of Python objects separated by commas. In someways a tuple is similar to a list in terms of indexing, nested objects and repetition but a tuple is immutable unlike lists which are mutable.
In this post we will be concentrating on various tuple methods.
Tuple consist of various methods for easy functioning and utilization of python script.
Many built-in functions can be used on tuples like min(), max(), len(), sum(), any(), all(), sorted() and tuple().
Apart from this, methods of tuple are count() and index().
List of tuple methods
- index()
- This method takes one argument and returns the index of the first appearance of an item in a tuple. We call a method using the dot operator in python.
T.index(value)
- Example:
>>> x=(11,22,33,44,55,22,66,77,88,99,22)
>>> x.index(22)
1
>>> x.index(77)
7- Here 22 is present on index 1,5 and 10 but its first occurence is considered.
- count()
- It returns the number of occurrences of value in given tuple.
T.count(value)
- Example:
>>> x=(11,22,33,44,55,22,66,77,88,99,22)
>>> x.count(22)
3
>>> x.count(44)
1
List of built-in functions used with tuple
- len()
- It returns the integer value of number of items present in the tuple.
len(tuple)
- min()
- It returns minimum (integer or ordinal) value from tuple
min(tuple)
- max()
- It returns the maximum (integer or ordinal) value from the tuple
max(tuple)
- sum()
- This function returns the arithmetic sum of all the items in the tuple.
- However, you can’t apply this function on a tuple with strings.
sum(tuple)- Example:
>>> k=(3,2,1)
>>> sum(k)
6
>>> j=(5.5,2,4)
>>> sum(j)
11.5
>>> i=('1','2','3')
>>> sum(i)
Traceback (most recent call last):
File "<pyshell#11>", line 1, in
sum(i)
TypeError: unsupported operand type(s) for +: 'int' and 'str'
>>>
- any()
- If even one item in the tuple has a Boolean value of True, then this function returns True. Otherwise, it returns False
>>> any(('','',8))
True- The value 8 does have a Boolean value of True. If it was rather the integer 0, it would’ve returned False.
>>> any(('','',0))
False
- all()
- Unlike any(), all() returns True only if all items have a Boolean value of True. Otherwise, it returns False.
>>> all(('1','2',8))
True
>>> all(('1','2',''))
False
- sorted()
- This function returns a sorted version of the tuple. The sorting is in ascending order, and it doesn’t modify the original tuple in Python.
- If we want to sort in descending order we can set reverse parameter as True.
sorted(tuple) #ascending order
sorted(tuple, reverse=True) #descending order- Example:
>>> r=(7,6,8,4,3,1,9)
>>> sorted(r)
[1, 3, 4, 6, 7, 8, 9]
>>> sorted(r,reverse=True)
[9, 8, 7, 6, 4, 3, 1]
- tuple()
- This function converts another sequence like list, string etc into a Python tuple.
tuple(sequence)- Example:
>>> LL=['a',8.3,57,0.6]
>>> tuple(LL)
('a', 8.3, 57, 0.6)
>>> st='python'
>>> tuple(st)
('p', 'y', 't', 'h', 'o', 'n')
>>>
Example of tuple methods
tup=(9,8,7,6,5,4,3,2,1,0,1,2,3)
tupl=('itvoyagers','1',2 )
print(" length of tup: ",len(tup)) #length
print(" length of tupl: ",len(tupl)) #length
print(" maximum of tup: ",max(tup)) #max()
print(" min of tup: ",min(tup)) #min()
print("Total number of 2's in tuple",tup.count(2))
print("first occurence of 2 in tuple",tup.index(2))
a=[11,21,31,41,51]
print(" convert list to tuple: ",tuple(a)) #type conversion
c={1:5,2:6}
print(" convert dictionary to tuple: ",tuple(a)) #type conversion
Output of tuple methods in python
Variable - length argument tuples
Functions can take a variable number of arguments. A parameter name that begins with * collects arguments into a tuple.
Example:
def many_val(*args):
print(args)
many_val(8,7,5,3)
many_val(1)
Output
(8, 7, 5, 3)
(1,)
Tuples as return values
The built-in function divmod takes two arguments and returns a tuple of two values, the quotient and remainder. You can store the result as a tuple:
>>> z = divmod(4,3)
>>> z
(1, 1)
>>> e,f=divmod(13,6)
>>> e
2
>>> f
1
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