《python编程，从入门到实践》第四章

##操作列表
#4.1遍历
cars=['bmw','audi','toyota','volvo']
for car in cars:
    print(car)
    
for car in cars:
    print("leave "+car.title()+", save life")
    
for car in cars:
    print("leave "+car.title()+", save life")
    print("hold your "+car+", bro!"+"n")
    
#4.2缩进错误
#4.3数值列表
for value in range(1,5):#1<=,<5左闭右开
    print(value)
    
numbers=list(range(1,6))
print(numbers)

even_numbers=list(range(2,11,2))#(出发，结束，步长)
print(even_numbers)

squares=[]
for value in range(1,11):
    square=value**2
    squares.append(square)
    
print(squares)

maxx=max(squares)
minn=min(squares)
summ=sum(squares)
#列表解析

square = [value**2 for value in range(1,11)]
print(square)

#使用一个for 循环打印数字1~20（含）。
for i in range(1,21):
    print(i)

onem=list(range(1,1000001))
#4.4部分列表
cars=['bmw','audi','toyota','volvo']    
print(cars[0:2])#切片
print(cars[:3])
print(cars[-2:])

#遍历切片
for car in cars[:3]:
    print(car.title())

#复制列表
cars1=cars[:]#两列表独立，不能直接用=

#4.5元组  （不可变列表）     用圆括号
triangle=(3,4,5)
#遍历元组
for tri in triangle:
    print(tri)
    
triangle(5,12,13)