"""
循环语句
for in循环
"""
#1-100的和
sum= 0
for x in range(101):
"""
range(101)//产生0到100的整数序列
range(1,100)//产生1到99的整数序列
range(1,100,2)//产生1到99的基数序列，步长为2
range(a,b,step)//产生a到b的序列，含a不含b,其中step为每个数的间隔增量
"""
sum+=x
print(sum)
#1-100的偶数和
sum = 0
for x in range(2,101,2):
sum+=x
print(sum)
sum = 0
for x in range(1,101):
if x%2==0:
sum+=x
print(sum)
#while循环
#猜数字 1-100
import random
answer = random.randint(1,100)#产生1-100的随机数
count = 0
while True:
count+=1
number =int(input("please guess a number:"))
if(number<answer):
print("smaller tahn answer")
elif(number>answer):
print("big than answer")
else:
print("you are right")
break
print("你总共猜了%d次"% count)
"""
输出乘法口诀表
"""
for i in range(1,10):
for j in range(1,10):
print("%d * %d = %d "%(i,j,i*j),end ="\t")
print("\n")
"""
判断一个数是不是素数
"""
from math import sqrt
number = int(input("give a number:"))
end =int(sqrt(number))
prime = True
for i in range(1,end+1):
if(number%i == 0):
prime =False
break;
if prime and number!=1:
print("%d is prime"%number)
else:
print("%d is not prime"%number)
_______________________________
"""
打印三角图案
*
**
***
****
*
**
***
*****
*
***
*****
*******
*********
"""
row = int(input("enter the raw"))
for i in range(row):
for j in range(0,i):
print("*",end =" ")
print()
row = int(input("enter the raw"))
for i in range(row):
for _ in range(i+1):
print("*",end = " ")
print()
for i in range(row):
for j in range(row):
if j<row-i-1:
print(" ",end ="")#先打印空格
else:
print("*",end="")#后打印*
print()
raw = int(input("enter thr raw:"))
for i in range(raw):
for j in range(raw-i-1):
print(" ",end =" ")#前面rraw-i+1个空格
for k in range(2*i+1):
print("*",end =" ")#接下来打印*号
print( )