Posted by - List
- List Operations
- List Functions
- List Methods
The list is a most versatile datatype available in Python which can be written as a list of comma-separated values (items) between square brackets. Important thing about a list is that items in a list need not be of the same type. Creating a list is as simple as putting different comma-separated values between square brackets
list1 = ['physics', 'chemistry', 1997, 2000]; list2 = [1, 2, 3, 4, 5 ]; list3 = ["a", "b", "c", "d"]
Similar to string indices, list indices start at 0, and lists can be sliced, concatenated and so on.
1.List
- Data structure
- Data type
- [ , , , , ] → Heterogeneous Elements
- Position or index
- First index is zero
- Second index is one
- Indexing
- Slicing
- Adding
- Multiplying
- Checking for membership
- Length of a sequence
- Finding largest elements
- Finding smallest elements
2.List Operations
- Accessing
- Updating
- Deleting
- Indexing
- Slicing
- Matrixes
- L = [ L0_1, L1_2, .. ,Lm_n]
- L[x/-n] L[x/:y/]
- del L[x]
- L_x+L_y – Concatenation
- L*n – Repetition
- x in L – Membership
3.List Functions
- len(L) : no_ele_L
- max(L) : Lar_L
- min(L) : Sml_L
- list(s) : s → L
4.List Methods
- L.append(x) : L←[.,.,x]
- L.count(x) : no_x_ele_L
- L.extend(M) : L← [L, M]
- L.index(x) : ele_x_posi_L
- L.insert(n,x) : L←L[.,x@nth,.]
- L.pop(/n) : L←pop_(end/nth)_ele_L
- L.remove(x) : L←rmv_x_ele_L
- L.reverse() : L ←rvs_L
- L.sort() : L ←asc_L
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