哪种语言网站建设,做单挣钱的网站,wordpress ios 默认,最近几天发生的新闻大事目录 一、字符串1.1 在字符串中使用变量 二、列表2.1 遍历列表练习题代码 2.2 列表元素的插入和删除涉及方法练习题代码 2.3 组织列表涉及方法练习题代码 2.4 索引 参考书#xff1a;Python从入门到实践#xff08;第二版#xff09;
一、字符串
1.1 在字符串中使用变量 f… 目录 一、字符串1.1 在字符串中使用变量 二、列表2.1 遍历列表练习题代码 2.2 列表元素的插入和删除涉及方法练习题代码 2.3 组织列表涉及方法练习题代码 2.4 索引 参考书Python从入门到实践第二版
一、字符串
1.1 在字符串中使用变量 f “{ 变量名 }” f代表formatPython把花括号里的变量名替换为其值来设置字符串的格式。Python3.6引入
代码示例
first_name input(Your first name is: )
last_name input(Your last name is : )
full_name f{first_name} {last_name}
print(fMy name is {full_name.title()})二、列表
2.1 遍历列表
练习题 将一些朋友的姓名存储在一个列表中并将其命名为names 。依次访问该列表中的每个元素从而将每个朋友的姓名打印出来。 代码
names [winnie,jack,lili,will,diana]
for name in names:print(fHello, my name is {name.title()})
else:print(The list is overlooped)代码解释
使用for循环遍历列表中的所有信息使用format字符串形式输出字符串中的变量使用title方法对列表中的字母进行首字母大写
2.2 列表元素的插入和删除
涉及方法
append() : 在列表末尾添加元素insert() 在列表任意位置添加元素remove() 根据具体值删除元素del 语句 删除整个列别或某一元素pop() 弹出任意元素
练习题 代码
#3-4
names [diane,kalinda,alicia,will,peter,cary]
for name in names:print(fDear {name.title()}, lets have a dinner together this evening.)
num_guests len(names)
print(fWe have invited {num_guests} guests now,)
print(\n)#3-5
print(Ops! Peter is busy with his campaign so he cant joy the dinner.\n)
names.remove(peter)
names.append(zerk)
for name in names:print(fDear {name.title()}, lets have a dinner together this evening.)
num_guests len(names)
print(fWe have invited {num_guests} guests now,)
print(\n)#3-6
print(We can invite more guests now because I have found a bigger dinner table now.\n)
names.insert(0,tom)
names.insert(int(len(names)/2),mary)
names.append(winnie)
for name in names:print(fDear {name.title()}, lets have a dinner together this evening.)
num_guests len(names)
print(fWe have invited {num_guests} guests now,)
print(\n)#3-7
print(Sorry, I can only invite 2 guests to joy the dinner.\n)
while len(names)2:name names.pop()print(fDear {name.title()}, sorry for the change, we can have dinner the next time!)
for name in names:print(fDear {name.title()}, you are still invited to the dinner tonight.)
del names[0]
del names[0]
print(names)输出如下 Dear Diane, let’s have a dinner together this evening. Dear Kalinda, let’s have a dinner together this evening. Dear Alicia, let’s have a dinner together this evening. Dear Will, let’s have a dinner together this evening. Dear Peter, let’s have a dinner together this evening. Dear Cary, let’s have a dinner together this evening. We have invited 6 guests now
Ops! Peter is busy with his campaign so he can’t joy the dinner.
Dear Diane, let’s have a dinner together this evening. Dear Kalinda, let’s have a dinner together this evening. Dear Alicia, let’s have a dinner together this evening. Dear Will, let’s have a dinner together this evening. Dear Cary, let’s have a dinner together this evening. Dear Zerk, let’s have a dinner together this evening. We have invited 6 guests now
We can invite more guests now because I have found a bigger dinner table now.
Dear Tom, let’s have a dinner together this evening. Dear Diane, let’s have a dinner together this evening. Dear Kalinda, let’s have a dinner together this evening. Dear Mary, let’s have a dinner together this evening. Dear Alicia, let’s have a dinner together this evening. Dear Will, let’s have a dinner together this evening. Dear Cary, let’s have a dinner together this evening. Dear Zerk, let’s have a dinner together this evening. Dear Winnie, let’s have a dinner together this evening. We have invited 9 guests now
Sorry, I can only invite 2 guests to joy the dinner.
Dear Winnie, sorry for the change, we can have dinner the next time! Dear Zerk, sorry for the change, we can have dinner the next time! Dear Cary, sorry for the change, we can have dinner the next time! Dear Will, sorry for the change, we can have dinner the next time! Dear Alicia, sorry for the change, we can have dinner the next time! Dear Mary, sorry for the change, we can have dinner the next time! Dear Kalinda, sorry for the change, we can have dinner the next time! Dear Tom, you are still invited to the dinner tonight. Dear Diane, you are still invited to the dinner tonight.
2.3 组织列表
涉及方法
sort对列表排序sorted对列表暂时排序不改变原有顺序reverse翻转列表
练习题 代码
#3-8
travel [italy,france,america,spain,denmark]
print(original:,travel)
print(sorted:,sorted(travel))
print(after sorted:,travel)
travel.reverse()
print(reverse:,travel)
travel.reverse()
print(reverse again:,travel)
travel.sort()
print(sort:,travel)
travel.sort(reverseTrue)
print(sort reverseTrue:,travel)#3-9
names [diane,kalinda,alicia,will,peter,cary]
print(The number of guests are %d. %len(names)) 2.4 索引 列表从前往后的下标从0开始从后往前的下标从-1开始
