Python Various Ways of Writing Loops

1. List Comprehension

[2*x+3 for x in list]

2. map

map(function, list)

A function can also be defined on the fly.

map(lambda x: function of x, list)

For multivariable,

map(lambda x,y:x+y, xlist, ylist)

3. zip and map

zip is useful in a map of multivariable function.

map(functionofxy, zip(xlist,ylist))

As given in the reference link, one good example is

map(sum,zip(A,B,C))

4. map and list comprehension

[map(lambda x: x+3, list) for list in shape2by2list]

Ref. Great Python Tricks for avoiding unnecessary loops in your code