Python Tuple & List

What is Tuple?

• A tuple is a collection that is ordered and unchangeable. Tuples are written with round brackets. It is a collection of objects which ordered and immutable. Allow duplicate values.

How to create Tuple?

• #Empty Tuple
• empty_tuple = ()
• print (empty_tuple)
• #Single Element
• To write a tuple containing a single value you have to include a comma, even though there is only one value
• x= (50,)
• #mutiple element
• x= (“apple”, “54.23″, “23″, “apple”, “India”)
• print (this tuple)

READ OR ACCESS

• To access values in the tuple, use the square brackets. For multiple elements use slicing.
• X = (10,20,30)
• X[0]
• X[0:3]  #Range of Indexes
• You can use positive and negative index both.

How to update Tuple?

• Tuples are unchangeable, that you cannot change, add, or remove items once the tuple is created.
• tup1 = (12, 34.56)
• # Following action is not valid for tuples 
• tup1[0] = 100  #throw Error

How to Delete Tuple?

• Tuples are immutable, so you cannot remove items from it.
• del a[0] #throw error
• #you can delete entire tuple
• del a

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What is List?

• List items are ordered, changeable, and allow duplicate values.It is created by placing all the items (python objects) inside square brackets [], separated by commas.Python objects may be of different types (integer, float, string etc.)

How to create List?

• Lists in Python can be created by just placing the sequence inside the square brackets[].
• colors = [‘red’, ‘blue’, ‘green’]
• To ensure List are ordered you can check below statements
• a = [1,2,”Peter”,4.50,”Ricky”,5,6]
• b = [1,2,5,”Peter”,4.50,”Ricky”,6]
• a ==b
• A list with a single object is sometimes referred to as a singleton list.

READ OR ACCESS

• List items are indexed and you can access them by referring to the index number that nay be positive or negative
• Positive index start with zero ( First Element)
• Negative index start with -1 ( Last Element)
• You can also use slicing to select multiple element in the list. [:] and [start:stop:step]

How to  update List?

• refer the index number
• x= [“apple”, 56.32, 23]
  x[0] = “blackcurrant“
• #you can also mention range of index
• x[1:3] = [99.99, “watermelon”]
• In case you specify more elements during update then it will insert the remaining value
• x[1:2] = [99.99, “watermelon”]
• In case you specify less items than you replace , then you will lose particular index value

INSERT NEW ELEMENTS.

• Append
• Concatenation
• Insert
• Extend

APPEND: It will add an item to the end of the list

• x= [“Hello”, “banana”, 23]
• x.append(“orange”)

INSERT :The insert() method inserts an item at the specified index

• X.insert(index,value)

EXTEND: To append elements from another list to the current list, use the extend() method.

• x.extend(y)

How to Delete list?

• del x[index]   #For single item deletion
• del x[start : stop]   #For Mutiple item deletion
• del x   #For list deletion

POP : The pop() method removes the specified index.

• X.pop(index)
• If you will not specify index it will remove last element from the list

REMOVE: The remove() method removes the specified item.

• X.remove(value)

CLEAR: He clear() method empties the list. The list still remains, but it has no content.

• X.clear()