what is difference between list and tuple in python
what is difference between list and tuple in python?
The differences between tuples and lists is , tuples cannot be changed unlike lists. tuples use parentheses, whereas lists use square brackets.
Python list example
#!/usr/bin/python #create an empty list s = list() for num in range(5): s.append(num) #print items from list s for item in s: print item
Run the code
bosch@bosch-Inspiron-N5050:~$ python sample.py 0 1 2 3 4
Let us change the 3rd list object
#!/usr/bin/python #create an empty list s = list() for num in range(5): s.append(num) #chnage list objects s[2]=10 #print items from list s for item in s: print item
output
bosch@bosch-Inspiron-N5050:~$ python sample.py 0 1 10 3 4
Python tuple example
#!/usr/bin/python #create an empty tuple s = tuple() s = (1,2,'wiki') #print items from tuple s for item in s: print item
Output:
bosch@bosch-Inspiron-N5050:~$ python sample.py 1 2 wiki
- We cannot change tuple objects. for example below code would give error.
#!/usr/bin/python #create an empty tuple s = tuple() s = (1,2,'wiki') #cannot chnage tuple s[0] = 5 #print items from tuple s for item in s: print item
bosch@bosch-Inspiron-N5050:~$ python sample.py
Traceback (most recent call last):
File "sample.py", line 8, in <module>
s[0] = 5
TypeError: 'tuple' object does not support item assignment
difference between list and tuple in python
- List objects are mutable and thus they can’t be used as a key in the dictionary, while tuples can be used as key in dictionary.
tup = (1,2)
li = [1,2]
e = {a: 1} # OK
c = {b: 1} # Error
- List objects can be changed while tuples are not changed.
- Lists are homogeneous while tuples are usually heterogeneous.
- Lists are for variable length, tuples are for fixed length.
Ref:
http://stackoverflow.com/questions/626759/whats-the-difference-between-lists-and-tuples
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