python627学习

1.推导式

[expression(i) for i in old_List if condition(i)]#列表
print([print(i) for i in [1, 2, 3] if i >=2])

{key:value for key,value in iterable}#字典
dict1={"username":"zhangsan","passwd":123456}
print({value: key for key, value in dict1.items()})

{value for value in iterable}#集合
print({i for i in range(10)})

2.99乘法表

1.左下角

for i in range(1,10):
    for j in range(1,i+1):
        print("%d*%d=%d"%(i,j,i*j),end="\t")
    print(" ")
end="\t"表示不换行

2.左上角

for i in range(9,0,-1):
    for j in range(1,i+1):
        print("%d*%d=%d"%(i,j,i*j),end="\t")
    print(" ")

3.右上角

for i in range(9,0,-1):
    for j in range(9-i):
        print("\t",end="\t")
    for h in range(i,0,-1):
        print("%d*%d=%d"%(i,h,i*h),end="\t")
    print(" ")

4.右下角

for i in range(1,10):
    for j in range(9-i):
        print("\t",end="\t")
    for h in range(i,0,-1):
        print("%d*%d=%d"%(h,i,h*i),end="\t")
    print(" ")