List Comprehensions
List handling
- Many programs involve a significant amount of list manipulation.
- Common problem: constructing new lists from an existing list
s = [ "3", "4", "10", "11", "12"]
t = [ ]
for n in s:
t.append(int(n))
map(func,s)
- Previous versions provided map() function
s = [ "3", "4", "10", "11", "12"]
t = map(int,s)
List comprehensions
- A convenient syntax for creating new lists from existing sequences
s = [ "3", "4", "10", "11", "12"]
t = [int(x) for x in s]
|