Ex29.9 Else and If

If条件格式的进一步应用

上一个练习，初步了解If语句的用法。在本练习，对IF语句进一步熟悉。如果有多个条件需要判断，多种情况需要罗列，IF语句如何应对？且看代码。

示例代码Ex30：

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people  = 30
cars  = 40
trucks = 15
if cars > people:
    print "We should take the cars."
elif cars < people:
    print "We should not take the cars."
else:
    print "We can't decide."
if trucks > cars:
    print  "That's two many cars."
elif trucks < cars:
    print "Maybe we could take the truck."
else:
    print "We still can't decide."
if people > trucks:
    print "Alright, lets's just take the trucks."
else:
    print "Fine, let's stay home then."

运行结果如下：

小结

elif 的用法是本练习关注的重点。