标签：range stat 整数 for循环 序列 one 方法 learn 循环
一 相关知识
1 range()函数
2 for循环
for iterating_var in sequence: statements(s)
3 append()方法
二 代码及执行结果
ex32.py文件
1 the_count = [1,2,3,4,5] 2 fruits = [‘apples‘,‘oranges‘,‘pears‘,‘apricots‘] 3 changes = [1,‘pennies‘,2,‘dimes‘,3,‘quarters‘] 4 5 # this first kind of for-loop goes through a list 6 for number in the_count: 7 print(f"This is count {number}") 8 9 # same as above 10 for fruit in fruits: 11 print(f"A fruit of type:{fruit}") 12 13 # also we can go through mixed lists too 14 # notice we have to use {} since we don‘t know what‘s in it 15 for i in changes: 16 print(f"I got{i}") 17 18 # we can also build lists,first start with an empty one 19 elements = [] 20 21 # then use the range function to do 0 to 5 counts 22 for i in range(0,6): 23 print(f"Adding {i} to the list.") 24 # append is a function that lists understand 25 elements.append(i) 26 27 # now we can print them out too 28 for i in elements: 29 print(f"Element was: {i}")
执行结果：
PS E:\3_work\4_python\2_code_python\02_LearnPythonTheHardWay> python ex32.py This is count 1 This is count 2 This is count 3 This is count 4 This is count 5 A fruit of type:apples A fruit of type:oranges A fruit of type:pears A fruit of type:apricots I got1 I gotpennies I got2 I gotdimes I got3 I gotquarters Adding 0 to the list. Adding 1 to the list. Adding 2 to the list. Adding 3 to the list. Adding 4 to the list. Adding 5 to the list. Element was: 0 Element was: 1 Element was: 2 Element was: 3 Element was: 4 Element was: 5
三 一些问题
1、如何创建一个二维列表？ 可以用这种列表中的列表： [[1,2,3],[4,5,6]]
2、列表（lists）和数组（arrays）难道不是一个东西吗？ 这取决于语言以及实现方法。在传统术语中，列表和数组的实现方式不同。在 Ruby 中都叫做 arrays，在 python 中都叫做 lists。所以我们就把这些叫做列表吧。
3、为什么 for-loop可以用一个没有被定义的变量？变量在 for-loop 开始的时候就被定义了，它被初始化到了每一次 loop 迭代时的当前元素中。
标签：range stat 整数 for循环 序列 one 方法 learn 循环
原文地址：https://www.cnblogs.com/luoxun/p/13307180.html
