Question

我正在编写一个脚本，如果数组的元素是主数组的子集，那么它会打印PASS，否则会打印FAIL。

我应该在下面的if-else语句中添加什么才能使其有效？

a = [1,2,3,4,5]
b = [1,2]
c = [1,9]

# The Passing Scenario 

if (i in a for i in b):
 print "PASS"
else:
 print "FAIL"

# The Failing Scenario

if (i in a for i in c):
 print "PASS"
else:
 print "FAIL"

Answer 1

使用all。

# the passing scenario
if all(i in a for i in b):
    print 'PASS'
else:
    print 'FAIL'

# the failing scenario
if all(i in a for i in c):
    print 'PASS'
else:
    print 'FAIL'

Answer 2

使用set s，很简单：

>>> a = [1,2,3,4,5]
>>> b = [1,2]
>>> c = [1,9]
>>> set(b).issubset(set(a))
True
>>> set(c).issubset(set(a))
False

Answer 3

这可以通过像

这样的设置操作来完成

a    = [1,2,3,4,5]
b, c = [1,2],[1,9]

print set(b) <= set(a)
# True
print set(c) <= set(a)
# False

Python中的简单if-else语句

3 个答案: