num = [108, 20, 78, 15, 8, 2, 5, 3, 11]
result = [x for x in num[::2] if x%2 == 0]
print result
list第二个冒号后显示的是步长。 for循环后得出的结果x。
2. Python对数字由小到大排序
num = [33, 56, 10, 3, 8, 17, 101, 88, 45, 99]
for i in range(0, len(num)):
for j in range (0, i):
if num[i] <= num[j]:
num[i], num[j] = num[j], num[i]
print num
3. Python如何执行一个shell命令
4. Python变量复制
import copy
a = [1, 2, 3, 4, ['a', 'b']]
b = a
c = copy.copy(a)
d = copy.deepcopy(a)
a.append(5)
a[4].append('c')
print 'a = ', a
print 'b = ', b
print 'c = ', c
print 'd = ', d
输出结果
a = [1, 2, 3, 4, ['a', 'b', 'c'], 5]
b = [1, 2, 3, 4, ['a', 'b', 'c'], 5]
c = [1, 2, 3, 4, ['a', 'b', 'c']]
d = [1, 2, 3, 4, ['a', 'b']]
