python改错题_笨办法学Python 习题 24: 更多练习
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。#-*-coding:utf-8-*-print"Let'spracticeeverything."print'You\'dneed...
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。# -*- coding:utf-8 -*-
print "Let's practice everything."
print 'You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.'
# \' 输出' \\输出 ] \n换行 \t 制表符,效果相当于点击Tab, 8个空格数量
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) # 使用这种方法接收返回值!是 返回值可以是多个
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)
结果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。
常见问题回答
为什么你在后面把 jelly_beans 这个变量名又叫成了 beans ?
这是函数的工作原理。记住函数内部的变量都是临时的,当你的函数返回以后,返回值可以被赋予一个变量。我这里是创建了一个新变量,用来存放函数的返回值。
倒着阅读代码是什么意思?
从最后一行开始,把你写的和我写的代码进行比较。如果这一行完全一样,就接着比较上一行,直到全部比较完为止。
这首诗是谁写的?
我写的。我的诗作偶尔也不赖吧。
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