习题 24: 更多练习¶

 ``` 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``` ```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) ```

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。
2. 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。