Python uses loops to generate a list

#-*-coding:utf-8-*-squares=[]for x in range: Squares.append (x**2) print squares#[0, 1, 4, 9, 16, 25, 36, 4 9,,, Bayi] #等价于squares =[x**2 for x in range (Ten)]print squares#[0, 1, 4, 9, 1,,,, 81]combs=[]for x in [ , 2,3]: for y in [3,1,4]: If X!=y:combs.append ((x, y)) print combs# equivalent to: combs=[(x, y) for x in [1,  2,3] for y in [3,1,4] if X!=y]print combs#[(1, 3), (1, 4), (2, 3), (2, 1), (2, 4), (3, 1), (3, 4)]vec=[-4,-2,0,2,4]print [X*2 for X in Vec]#[-8, -4, 0, 4, 8]print 30* ' * ', ' Print [x for x in VEC if x>=0] ', 30* ' * ' Print [x for x in VEC   If x>=0]#[0, 2, 4]print [ABS (x) for x in Vec]#[4, 2, 0, 2, 4]freshfruit=[' banana ', ' apple ', ' loganberry ', ' passion  Fruit '] #strip () Remove the string end-to-end space print [Weapon.strip () for weapon in freshfruit]#[' banana ', ' apple ', ' loganberry ', ' passion Fruit ']print 30* ' * ', "[(x,x**2) for X in range (6)]", 30* ' * ' Print [(x,x**2)-X in range (6)]#[(0, 0), (1, 1), (2, 4) , (3, 9), (4, 16), (5, 25)]vec=[[1,2,3],[4,5,6],[7,8,9]]print [num for elem in VEC for num in Elem]#[1, 2, 3, 4, 5, 6, 7, 8, 9]matrix=[[1,2,3  , 4],[5,6,7,8],[9,10,11,12]] #list中的每个元素都是list, the elements in each list element in the list are combined by index into a new listprint [[Row[i] for row in the matrix] for I in range (4)]#[[1, 5, 9], [2, 6, ten], [3, 7, one], [4, 8, 12]]transposed=[]for I in range (4): Transposed.append ([row[i ] for row in matrix]) print transposed#[[1, 5, 9], [2, 6, ten], [3, 7, one], [4, 8,]] #等价于: transposed=[]for i in Ran GE (4): transposed_row=[] for row in Matrix:transposed_row.append (Row[i]) transposed.append (transposed_       Row) print transposed# equivalent to zip (*matrix) print zip (*matrix) #[(1, 5, 9), (2, 6, 10), (3, 7, 11), (4, 8, 12)]

In addition, map () can also return List,map () is a Python built-in high-order function that receives a function f and a list, and by putting the function f on each element of the list in turn, gets a new list and returns.
#lambda表示匿名函数, the X in front of the colon is the function argument, the colon is followed by an expression, and the anonymous function has a limit, that is, there can be only one expression, without writing return, the return value is the result of the expression.

Squares=map (lambda x:x**2,range) print   

Python uses loops to generate a list