Python学习-操作列表

Python跟着[美] 埃里克·马瑟斯的Python编程从入门到实践第2版学的，当时买回来这本书就在书的扉页写下来日期“2021.6.15”，也是在这一天第一次见到了我的导师。

不说多了，今天早上上了节英语课，下午三点多到自习室待到现在。Python学了操作列表这一小节，主要有遍历整个列表、用range函数创建数值列表、切片、遍历切片、元组、遍历元组，今天的课后动手练一练都能做对，一个小小的突破！

#10.28学习记录
names=["xiaohan","xiaoyan","xiaogang"]
print(names[-1])
print(names[0])
print(f"my name is {names[0]},you have some question!")
names[1]="xiaopei"
print(names[1])
#操作列表  for循环
lovers=["xiaol","xiaop","xiaoy"]
for nihao in lovers:      #这里特别注意，for循环这一行末尾要加冒号（：）print(nihao)    变量"nihao"自己随便定义magicians=["liuqian","xiehao","shengli"]
for magician in magicians:print(magician)the lovin=["hahahha"]   #变量定义只能是一个词，不可以多个词
print(the lovin)words=["you","can","tell","me"]
for xiaolei in words:print(xiaolei)lovers=["xiaol","xiaop","xiaoy"]
for affectiona in lovers:  #经历三次迭代print(f'{affectiona.title()},I write to you every week')print(f"Nice talking to you,{affectiona.title()}.\n")   #注意换行符“\n”的位置lovers=["xiaol","xiaop","xiaoy"]
for affectiona in lovers:  #经历三次迭代print(f'{affectiona.title()},I write to you every week')  #在for循环后，没有缩进的代码只运行一次print(f"Nice talking to you,{affectiona.title()}.\n")   #注意换行符“\n”的位置words=["tell","me","why"]
for word in words:print({word.title()})lovers=["xiaol","xiaop","xiaoy"]
for affectiona in lovers:  #经历三次迭代print(f'{affectiona.title()},I write to you every week')print(f"Nice talking to you,{affectiona.title()}")   #注意换行符“\n”的位置print(f"I want to see you next time,{affectiona.title()}.\n")
#对于for语句后面要循环的语句一定要缩进
lovers=["xiaol","xiaop","xiaoy"]
for affectiona in lovers:  #经历三次迭代
print(affectiona)
lovers=["xiaol","xiaop","xiaoy"]
for affectiona in lovers:  #经历三次迭代print(affectiona)
magicians = ['alice', 'david', 'carolina']
for magician in magicians:print(magician.title() + ", that was a great trick!")print("I can't wait to see your next trick, " + magician.title() + ".\n")#P48小练习
Pizzas=["Italian pizza",'American pizza']
for Pizza in Pizzas:print(Pizza)Pizzas=["Italian pizza",'American pizza']
for Pizza in Pizzas:print(f"There are many kinds of pizza I like to eat, but my favorite is {Pizza}")
print(f"Italian pizza looks good and American pizza is delicious!")
print(f"I really love pizza!")animals=["cat","dog","bear"]
for animal in animals:print(animal)
animals=["cat","dog","bear"]
for animal in animals:print(f"A {animal} would make a great pet.")
print(f"They are all my favorite animals!")#创建数值列表
#用range函数，此处本应该打印1-10数字，但实际运行只会打印1-9，因为这是编程语言中的差一行为，只会打印到指定的第二个值时停止
for me in range(0,10):print(me)
for me in range(1,100000):print(me)
for me in range(10):print(me)#函数range几乎能创建任何需要的数集
numbers=list(range(1,20))   #创建数字列表，注意list后面用（），不是用[].
print(numbers)numbers=list(range(1,100,11)) #用range函数还可以指定步长，例如此，从1开始，然后不断加11，直到达到或超过100
print(numbers)xiaoma=[]
for xiaolei in range(1,1000,30):haha=xiaolei**2     #（**2）表示乘方运算xiaoma.append(haha)   #append在末尾添加列表函数
print(xiaoma)xiaohao=[]
for xiaolei in range(1,1000):xiaohao.append(xiaolei**2)   #append在末尾添加列表函数
print(xiaohao)numbers=[1,100,85,5498,421]
print(min(numbers))  #对列表进行求均值、最大值、最小值等计算
print(max(numbers))
print(sum(numbers))
print(mean(numbers))#列表解析
example=[numbers**2 for numbers in range(1,10)]   #此时这行代码后面不需要冒号
print(example)example=[li**2 for li in range(1,10,2)]
print(example)#P52小练习
numbers=list(range(1,20))   #注意此处使用list()
print(numbers)
numbers=[number for number in range(1,20,2)]
print(numbers)
numbers=list(range(1,10000001))
print(numbers)
numbers=list(range(1,10000001))
for number in numbers:print(number)
numbers=list(range(1,1000001))
print(min(numbers))
print(max(numbers))
print(sum(numbers))numbers=list(range(1,21,2))
for number in numbers:print(number)
numbers=list(range(3,31,3))
for number in numbers:print(number)
numbers=[]
for number in range(1,11):numbers.append(number**3)
print(numbers)
cube = [1 ** 3, 2 ** 3, 3 ** 3, 4 ** 3, 5 ** 3, 6 ** 3, 7 ** 3, 8 ** 3, 9 ** 3, 10 ** 3]
for value in cube:print(value)
numbers=[value**3 for value in range(1,11)]
print(numbers)#切片
hansome_boy=["wangjunkai","yiyangqianxi","wangyuan"]
print(hansome_boy[0:3])  #提取列表第一、二、三个元素，将起始索引指定为0，终止索引指定为3
print(hansome_boy[0])
print(hansome_boy[:2])  #没指定第一个索引，将自动从表头开始，将自动索引第一、二个元素
print(hansome_boy[1:])  #没指定终止索引，将从第二个元素开始索引到末尾的所有元素
print(hansome_boy[-2:])  #负数索引返回距离列表末尾相应距离的元素，如此处表示索引最后两个人
#遍历切片
hansome_boys=["wangjunkai","yiyangqianxi","wangyuan"]
for hansome_boy in hansome_boys[:]: #省略起始索引和结束索引即为全部索引print(hansome_boy)
#复制列表
xiaohao=[1,3,4,5]
xiaoli=xiaohao[:]
print(xiaohao)
print(xiaoli)
xiaohao.append(9)
xiaoli.append(10)
print(xiaohao)
print(xiaoli)#P57小练习
hansome_boys=["wangjunkai","yiyangqianxi","wangyuan","matianyu","sunhonglei"]
print("The first three items in list are:")
print(hansome_boys[:3])
print("Three items from the middle of the list are:")
print(hansome_boys[1:4])
print("The last three items in list are:")
print(hansome_boys[-3:])Pizzas=["Italian pizza",'American pizza']
friend_pizzas=Pizzas[:]
Pizzas.append("chinese pizza")
print(Pizzas)
friend_pizzas.append("chinese pizza")
print(friend_pizzas)
print("My favorite pizza are:")
for Pizza in Pizzas:print(Pizza)
print("My friend's favorite pizza are:")
for Pizza in friend_pizzas:print(Pizza)#元组  Python将不可修改的值称为不可变的，不可变的列表称为元组 用圆括号
dimension=(12,30)
dimension[0]=18  #此处操作被禁止，不能修改元组的元素
print(dimension[0])
#遍历元组的所有值
dimensions=(10,20,30,40,50,60,70,80,90)
for dimension in dimensions:print(dimension)#P59小练习
foods=("bread","rice","noddles","corn","dumplings")
for food in foods:print(food)
foods=("bread","rice","noddles","corn","dumplings")
print(foods[1:])#python中每级缩进都使用四个空格，一般用制表符缩进，不用空格
#使用Python时，谨记每行不超过80个字符（没有硬性规定，大家形成的通识）

明天继续学习，加油！

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