Python练习-- List Comprehensions

#!/usr/bin/python# -*- coding: utf-8 -*-print('List Comprehensions!!')mylist=[x*x for x in range(1,11)]print(mylist)mylist2 = [x*x for x in range(1,10) if x%2 == 0]print(mylist2)mylist3 = [m+n for m in 'ABC' for n in 'XYZ']print(mylist3)import osmylist4 =[d for d in os.listdir('.')]print(mylist4)d = {'x': 'A', 'y': 'B', 'z': 'C' }for k,v in d.items():    print(k,'=',v)mylist5 = [k+'='+v for k,v in d.items() ]print(mylist5)L = ['Hello', 'World', 'IBM', 'Apple']lowerL = [s.lower() for s in L]print(lowerL)L2 = ['Hello', 'World', 18, 'Apple', None]lowerL2 = [s.lower() for s in L2 if isinstance(s,str)]print(lowerL2)