python--List

Creation of lists

1, common method to create a list

list = []

2, list analysis, List deduction type

Using list parsing can be almost 1 time times faster than using a normal method. It is therefore recommended to use list parsing.

Grammar

[Expression for Iter_val in iterable if COND_EXPR]

Requirements: List 1~10 of all numbers squared >>>l = [i**2 for i in range (1,11)]>>>print l[1, 4, 9, 16, 25, 36, 49, 64, 8 1, +]  

Updates to the list

 >>> list = [1,2,3 >>> list.append ("  4   ") #   add list item  >>> list[ 1, 2, 3,  " 4  "    >>> del  list[3] #   delete list item  >>> list[ 1, 2, 3] 

>>> List1 = [All in all]>>> list2 = [4,5,6]>>> list1.extend (list2)# append multiple values at once >>> list1[1, 2, 3, 4, 5, 6]

>>> list = [1,2,2,3,4]>>> list.remove (2)# Remove the first occurrence of a value in the list >>> list[1, 2, 3, 4]>>> list.pop ()# removes an element from the list (the last element by default) and returns the value of the element 4 >>> list[1, 2, 3]

>>> list = [List.insert]>>> 1,4# insert >>> list[1, 4, 2, 3]

List Common methods

List.index ()

# Find the element location >>> list = [List.index]>>> A (2)1

List.count ()

List.reserve ()

# Invert >>> list = [List.reverse]>>> ()>>> list[ 3, 2, 1]

List.clear ()

# Empty list >>> lists = [list.clear]>>> ()>>> list[]

List.sort ()

>>> list = [1,3,2,6,5]>>> list.sort ()# sorting >>> list[1 , 2, 3, 5, 6]

python--List