习题 24: 更多练习 · 笨办法学 Python

# 习题 24: 更多练习你离这本书第一部分的结尾已经不远了，你应该已经具备了足够的 Python 基础知识，可以继续学习一些编程的原理了，但你应该做更多的练习。这个练习的内容比较长，它的目的是锻炼你的毅力，下一个习题也差不多是这样的，好好完成它们，做到完全正确，记得仔细检查。 <table class="highlighttable"><tbody><tr><td class="linenos"> <div class="linenodiv"> <pre> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37</pre> </div> </td> <td class="code"> <div class="highlight"> <pre>print "Let's practice everything." print 'You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.'  poem = """ \tThe lovely world with logic so firmly planted cannot discern \n the needs of love nor comprehend passion from intuition and requires an explanation \n\t\twhere there is none. """  print "--------------" print poem print "--------------"   five = 10 - 2 + 3 - 6 print "This should be five: %s" % five  def secret_formula(started): jelly_beans = started * 500 jars = jelly_beans / 1000 crates = jars / 100 return jelly_beans, jars, crates   start_point = 10000 beans, jars, crates = secret_formula(start_point)  print "With a starting point of: %d" % start_point print "We'd have %d beans, %d jars, and %d crates." % (beans, jars, crates)  start_point = start_point / 10  print "We can also do that this way:" print "We'd have %d beans, %d jars, and %d crates." % secret_formula(start_point) </pre> </div> </td> </tr></tbody></table> ### 你应该看到的结果 ~~~ $ python ex24.py Let's practice everything. You'd need to know 'bout escapes with \ that do newlines and tabs. -------------- The lovely world with logic so firmly planted cannot discern the needs of love nor comprehend passion from intuition and requires an explanation where there is none. -------------- This should be five: 5 With a starting point of: 10000 We'd have 5000000 beans, 5000 jars, and 50 crates. We can also do that this way: We'd have 500000 beans, 500 jars, and 5 crates. $ ~~~ ### 加分习题 1. 记得仔细检查结果，从后往前倒着检查，把代码朗读出来，在不清楚的位置加上注释。 1. 故意把代码改错，运行并检查会发生什么样的错误，并且确认你有能力改正这些错误。