习题 7: 更多打印
现在我们将做一批练习，在练习的过程中你需要键入代码，并且让它们运行起来。我不会解释太多，因为这节的内容都是以前熟悉过的。这节练习的目的是巩固你学到的东西。我们几个练习后再见。不要跳过这些习题。不要复制粘贴！
python2:
print "Mary had a little lamb." print "Its fleece was white as %s." % 'snow' print "And everywhere that Mary went." print "." * 10 # what'd that do? end1 = "C" end2 = "h" end3 = "e" end4 = "e" end5 = "s" end6 = "e" end7 = "B" end8 = "u" end9 = "r" end10 = "g" end11 = "e" end12 = "r" # watch that comma at the end. try removing it to see what happens print end1 + end2 + end3 + end4 + end5 + end6, print end7 + end8 + end9 + end10 + end11 + end12
你应该看到的结果：
Python3的代码：
此处建议一定要先自己手打一遍再看我的代码，对于Python3来说，打印的变动还是比较大的。如果你手打出的代码执行时报错了，请先自己试试排查错误
print ("Mary had a little lamb.") print ("Its fleece was white as %s." % 'snow') print ("And everywhere that Mary went.") print ("." * 10) # what't that do? end1 = "C" end2 = "h" end3 = "e" end4 = "e" end5 = "s" end6 = "e" end7 = "B" end8 = "u" end9 = "r" end10 = "g" end11 = "e" end12 = "r" # watch that comma at the end. try removing it to see what happens print (end1 + end2 +end3 + end4 + end5 + end6,end7 + end8 + end9 + end10 + end11 + end12)
输出的结果为：
有没有发现什么区别？（当然，也有可能是我打错了。。。）
加分习题
接下来几节的加分习题是一样的。
1. 逆向阅读，在每一行的上面加一行注解。
2. 倒着朗读出来，找出自己的错误。
3. 从现在开始，把你的错误记录下来，写在一张纸上。
4. 在开始下一节习题时，阅读一遍你记录下来的错误，并且尽量避免在下个练习中再犯同样的错误。
5. 记住，每个人都会犯错误。程序员和魔术师一样，他们希望大家认为他们从不犯错，不过这只是表象而已，他们每时每刻都在犯错。
