练习:
1,计算100以内奇数的和
python
#计算100以内所有奇数的和
sum = 0
# n = 1
# while n < 100:
# # sum = sum + n
# sum += n
# # n = n + 2
# n += 2
# print(sum)
n = 99 #求偶数时n = 100
while n > 0:
sum += n
# n = n - 2
n -= 2
print(sum)
2,打印直角三角形
python
*
**
***
****
*****
******
layer = int(input("请输入要打印的层数:")) #layer=3
index = 1
while index <= layer: #layer=3
#打印*
j = 1
while j <= index: #index = 1 2 3
print("*",end="")
j += 1
print() #换行
index += 1 # index = 2 3 4
3,打印九九乘法表
python
i = 1
while i <= 9:
j = 1
while j <= i:
print("%s * %s = %s "%(j,i,(i*j)),end="")
j += 1
print() #换行
i += 1
优化:
python
i = 1
while i <= 9:
j = 1
while j <= i:
res = i * j
if res < 10:
print("%s * %s = %s "%(j,i,(i*j)),end="")
else:
print("%s * %s = %s "%(j,i,(i*j)),end="")
j += 1
print() #换行
i += 1
4,判断一个数是否为质数(质数)
质数又称为素数,一个大于1的自然数,除了1和它本身之外,不能被其他自然数整数的数叫做质 数,最小的质数是2,它是唯一一个偶数质数,例如:2,3,5,7,11,13,17等
python
#判断一个数是否为质数(素数)
num = int(input("请输入一个数:"))
if num <=1:
print("这个数不是质数")
elif num == 2:
print("这个数是质数")
else:
i = 2
while i < num:
if num % i == 0:
print("这个数不是质数")
break
i += 1
else:
print("这个数是质数")
5,实现猜单词的小游戏
python
小提示:
import random
word = ("easy","python","difficult","hello")
random.choice(word)
将单词的字母顺序打乱
random.randrange()
len()
import random
dir(random) ----- 查看某个模块(random)的所有的方法
help() ----- 调取帮助文档
python
import random
WORDS = ("import","pyhon","hello","easy","difficult")
print("欢迎来到猜单词游戏!请将乱序的单词组合成正确的单词")
iscontinue = "Y"
while iscontinue == "Y" or iscontinue == "y" or iscontinue == "YES":
words = random.choice(WORDS)
right = words
# print(words)
#打乱顺序
newword = ""
while words:
position = random.randrange(len(words))
# print(position)
# newword = newword + words[position]
newword += words[position]
# print(newword)
words = words[:position]+words[(position+1):]
print("乱序后的单词是:",newword)
guess = input("请你猜单词:")
"""
if guess == right :
print("恭喜你,猜对了!")
else:
print("抱歉,猜错了!")
"""
while guess != right and guess != "":
print("抱歉,猜错了!")
guess = input("请你继续猜:")
if guess == right :
print("恭喜你,猜对了!")
iscontinue = input("你是否继续游戏Y/N:")
6,实现两个数的交换(用户输入两个数,存储到内存中的)
python
num1 = int(input("请输入第一个数:"))
num2 = int(input("请输入第二个数:"))
#方法一:取中间变量
# temp = num1
# num1 = num2
# num2 = temp
#方法二:求和法
# num1 = num1 + num2 # 30 = 10 + 20
# num2 = num1 - num2 # 30 - 20 = 10
# num1 = num1 - num2 # 30 - 10 = 20
# 方法三:异或交换法(python独有 引入了寄存器)
num1,num2 = num2,num1
print("交换后的num1 = %s ,num2 = %s"%(num1,num2))
7,一个自然数与3的和是5的倍数,以3的差是6的倍数,这个自然数最小是多少?(while)
python
# index = 0
# while True:
for i in range(1000):
if (i + 3) % 5 == 0 and (i - 3 ) % 6 == 0:
print(i)
break
i += 1
8,在400~500之间求一个数,它被2取余1,被5取余是3,被8取余是1,这个数是多少?
python
for i in range(400,501):
if i % 2 == 1 and i % 5 == 3 and i % 8 == 1:
print(i)
break
9,打印等腰三角形
python
layer = int(input("请输入要打印的层数:"))
#每一行
for i in range(1,layer+1):
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
print("*",end="")
print("")
10,打印实心菱形
python
layer = int(input("请输入要打印的层数:"))
while layer % 2 == 0:
layer = int(input("请重新输入要打印的层数(注意要输入奇数行):"))
#上半部分
for i in range(1,layer // 2 + 2): #上半部分多打印一行 layer // 2 + 1 前闭后开的区间
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
print("*",end="")
print("")
#下半部分
for i in range(layer // 2 ,0,-1):
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
print("*",end="")
print("")
11,打印空心菱形
python
layer = int(input("请输入要打印的层数:"))
while layer % 2 == 0:
layer = int(input("请重新输入要打印的层数(注意要输入奇数行):"))
#上半部分
for i in range(1,layer // 2 + 2): #上半部分多打印一行 layer // 2 + 1 前闭后开的区间
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
#判断一下是否是第一个和最后一个
if j == 0 or j == star_num - 1:
print("*",end="")
else:
print(" ",end="")
print("")
#下半部分
for i in range(layer // 2 ,0,-1):
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
#判断一下是否是第一个和最后一个
if j == 0 or j == star_num - 1:
print("*",end="")
else:
print(" ",end="")
print("")
12,打印两个组合在一起的三角形
python
layer = int(input("请输入要打印的层数:"))
while layer % 2 == 0:
layer = int(input("请重新输入要打印的层数(注意要输入奇数行):"))
#上半部分
for i in range(1,layer // 2 + 2): #上半部分多打印一行 layer // 2 + 1 前闭后开的区间
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
#判断一下是否是第一个和最后一个
if j == 0 or j == star_num - 1 or i == layer // 2 + 1:#i == layer // 2 +
1判断是不是最后一行
print("*",end="")
else:
print(" ",end="")
print("")
#下半部分
for i in range(layer // 2 ,0,-1):
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
#判断一下是否是第一个和最后一个
if j == 0 or j == star_num - 1:
print("*",end="")
else:
print(" ",end="")
print("")
13,打印圣诞树
python
layer = int(input("请输入要打印的层数:"))
while layer % 2 == 0:
layer = int(input("请重新输入要打印的层数(注意要输入奇数行):"))
#上半部分
for i in range(1,layer // 2 + 2): #上半部分多打印一行 layer // 2 + 1 前闭后开的区间
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
#判断一下是否是第一个和最后一个
if j == 0 or j == star_num - 1 or i == layer // 2 + 1 or j == star_num
// 2:#i == layer // 2 + 1判断是不是最后一行 j == star_num // 2判断是不是中间那一列
print("*",end="")
else:
print(" ",end="")
print("")
#下半部分
for i in range(layer // 2 ,0,-1):
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
#判断一下是否是第一个和最后一个
if j == star_num // 2:
print("*",end="")
else:
print(" ",end="")
print("")
14,打印以下图形
python
layer = int(input("请输入要打印的层数:"))
while layer % 2 == 0:
layer = int(input("请重新输入要打印的层数(注意要输入奇数行):"))
#上半部分
for i in range(1,layer // 2 + 2): #上半部分多打印一行 layer // 2 + 1 前闭后开的区间
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
#判断一下是否是第一个和最后一个
if j == 0 or j == star_num - 1 or i == layer // 2 + 1 or j == star_num
// 2:#i == layer // 2 + 1判断是不是最后一行 j == star_num // 2判断是不是中间那一列
print("*",end="")
else:
print(" ",end="")
print("")
#下半部分
for i in range(layer // 2 ,0,-1):
#计算空格的个数
sapce_num = layer - i
for j in range(0,sapce_num):
print(" ",end="")
#计算*的个数
star_num = 2 * i - 1
for j in range(0,star_num):
#判断一下是否是第一个和最后一个
if j == 0 or j == star_num - 1 or j == star_num // 2:
print("*",end="")
else:
print(" ",end="")
print("")