python05

d.keys/values/items

for m in range(1,10):
    for n in range(1,m+1):
        print("{0}*{1}={2}".format(m,n,(m*n)),end="\t")
    print()

my_text="i love you,i love sxt,i love gaoqi"
char_count={c:my_text.count(c) for c in my_text}
print(char_count)

gnt=(x for x in range(4))
#print(tuple(gnt))
for x in gnt:
    print(x,end=",")

绘制不同颜色的多个同心圆

import turtle

t=turtle.Pen()

my_colors=("red","green","yellow","black")

t.width(4)
t.speed(1)
for i in range(10):
    t.penup( )
    t.goto(0,-i*10)
    t.pendown( )
    t.color(my_colors[i%len(my_colors)])
    t.circle(15+i*10)

turtle.done( )

Return两个作用 1.返回值 2.结束函数的执行