day2
st="python的创始人是Guido"
print(st[11:])
print(st[-1:-6:-1])
print(st[::3])
a="你"
b="最帅"
print(a+b)
print(a+b*3)
import random
for i in range(10):
l=str(random.randint(0,1000))
n=l[::-1]
if l==n:
print(l[::-1])
for x in range(20):
for y in range(33):
for z in range(3,100):
if 5*x+3*y+z/3==100 and x+y+z==100:
print(x,y,z,)
st=input("请输入一个字符串")
sub=0
sua=0
for i in st:
if "a"<=i<="z" or "A"<=i<="Z":
sub+= 1
elif "0"<=i<="9":
sua+= 1
print("字母个数为:{},数字个数为:{}". format(sub,sua))