Python学习：函数打包

标签：python

一：首先看一个小程序

<span style="font-size:18px;">array = [0,1,2,3,4]
k = 0
for i in array:
    k = k + i
print k
</span>

如果我想现在想求数组array2元素的总和的话，难道还要重复上面的操作吗？

<span style="font-size:18px;">array2 = [2,4,6]</span>

<span style="font-size:18px;">我们可以对程序打包，即自定义函数</span>

<span style="font-size:18px;">
</span>

<span style="font-size: 18px; background-color: rgb(102, 255, 255);"><strong>二：打包函数</strong></span>

<span style="font-size:18px;"></span><pre name="code" class="python">array = [0,1,2,3,4]
def sum(array):
    k = 0
    for i in array:
        k = k + i
    return k
print sum(array)

<span style="font-size: 18px; background-color: rgb(102, 255, 255);"><strong>三总结：</strong></span>

<span style="font-size:18px;"><span style="color:#ff0000;">（1）循环数组  for i in array：</span></span>

<span style="color:#ff0000;">（2）注意python代码的缩进，<span style="font-family: simsun; line-height: 21px; background-color: rgb(188, 211, 229);">同一层次的语句</span><span style="font-family: simsun; line-height: 21px; background-color: rgb(188, 211, 229);">必须</span><span style="font-family: simsun; line-height: 21px; background-color: rgb(188, 211, 229);">有相同的缩进。</span></span>

<span style="font-size:18px;"><span style="color: rgb(70, 70, 70); font-family: simsun; font-size: 14px; line-height: 21px; background-color: rgb(188, 211, 229);"></span></span><pre name="code" class="python">array = [0,1,2,3,4]
k = 0
for i in array:
        k = k + i
print k

<span style="font-size:18px;"><span style="color: rgb(70, 70, 70); font-family: simsun; font-size: 14px; line-height: 21px; background-color: rgb(188, 211, 229);">
</span></span>

<span style="font-size:18px;"><span style="color: rgb(70, 70, 70); font-family: simsun; font-size: 14px; line-height: 21px; background-color: rgb(188, 211, 229);">如果修改为：</span></span>

<span style="font-family: simsun; line-height: 21px; background-color: rgb(188, 211, 229);"></span><pre name="code" class="python" style="color: rgb(70, 70, 70); font-size: 14px;">array = [0,1,2,3,4]
k = 0
for i in array:
        k = k + i
        print k

那么输出结果为：

0
1
3
6
10

<span style="color:#ff6666;">（3）定义函数用关键字def</span>

<span style="font-size:18px;"><span style="color: rgb(70, 70, 70); font-family: simsun; font-size: 14px; line-height: 21px; background-color: rgb(188, 211, 229);">
</span></span>

<span style="font-size:18px;"><span style="color: rgb(70, 70, 70); font-family: simsun; font-size: 14px; line-height: 21px; background-color: rgb(188, 211, 229);">
</span></span>

Python学习：函数打包

标签：python

原文地址：http://blog.csdn.net/u013628152/article/details/43158715