range

#range当做:范围列表[],列表中的元素是数字,且可控的有效数字范围
#一般与for 配合使用
# for i in range(1,10):  #[1,2,3,4...9]
#     print(i)
# for i in range(1,101):  #
#     print(i)
# for i in range(11):  #
#     print(i)
# for i in range(1,10,2):  # [1,3,5,7,9]
#     print(i)
# for i in range(10,0,-1):
#     print(i)
# for i in range(10,-2,-1):
#     print(i)

l1 = [1,2,3,'alex',[2,3,'wusir'],7]
for i in l1:
    if type(i) == list:
        for j in i:
            print(j)
    else:
        print(i)

个人理解 range的用法和切片索引差不多,有异曲同工之妙.或者这个就是按照索引和切片来的吧.

l1 = [1,2,3,'alex',[2,3,'wusir'],7]
l3=l1[4]="2\n3\nwusir"
for i in l1:
    print(i)

上面是我用for语句替换的列表中小列表的元素的代码,用于练习.和理解索引和切片的概念,以及应用