python2.7练习小例子（二十一）
21）：1、题目：两个乒乓球队进行比赛，各出三人。甲队为a,b,c三人，乙队为x,y,z三人。已抽签决定比赛名单。有人向队员打听比赛的名单。a说他不和x比，c说他不和x,z比，请编程序找出三队赛手的名单。
程序源代码：
#!/usr/bin/python
# -*- coding: UTF-8 -*-
for i in range(ord('x'),ord('z') + 1):
for j in range(ord('x'),ord('z') + 1):
if i != j:
for k in range(ord('x'),ord('z') + 1):
if (i != k) and (j != k):
if (i != ord('x')) and (k != ord('x')) and (k != ord('z')):
print 'order is a -- %s\t b -- %s\tc--%s' % (chr(i),chr(j),chr(k))
以上实例输出结果为：
order is a -- z b -- x c--y
#!/usr/bin/python
# -*- coding: UTF-8 -*-
for a in ['x','y','z']:
for b in ['x', 'y', 'z']:
for c in ['x', 'y', 'z']:
if(a!=b)and(b!=c)and(c!=a) and (a!='x') and (c!='x') and (c!='z'):
print 'a和%s比赛，b和%s比赛，c和%s比赛' %(a,b,c)
#!/usr/bin/python
# -*- coding: UTF-8 -*-
n=['a','b','c']
m=[]
for i in range(3):
if n[i]!='a' and n[i]!='c':
m.insert(i,'x')
elif n[i]!='c':
m.insert(i,'z')
else:
m.insert(i,'y')
print 'a--%s, b--%s, c--%s' %(m[0], m[1], m[2])
#coding:UTF-8
n=['a','b','c']
m=['x','y','z']
L=[]
for i in range(0,3):
for j in range(0,3):
L.append(n[i]+m[j])
L.remove('ax')
L.remove('ay')
L.remove('by')
L.remove('bz')
L.remove('cx')
L.remove('cz')
print(L)
Python2.x 与 Python3.x 均可执行：
#!/usr/bin/python
# -*- coding: UTF-8 -*-
import itertools
A = ["a", "b", "c"]
B = ["x", "y", "z"]
team = [] # 存储比赛名单
rankB = [list(each) for each in itertools.permutations(B)] # 将对手的全部组合方式列出来
while True:
flag = 0
team = list(zip(A, B)) # 匹配选手
print(team)
for each in team:
if (("a" in each) and ("x" in each)) or (("c" in each) and (("x" in each) or ("z" in each))): # 判断是否符合对阵要求
flag = 1 # 如不符合则打个标记
break
if flag:
B = rankB.pop() # 改变一下对手位置
else:
break
for v1, v2 in team:
print("%s 对阵 %s" % (v1, v2))
2、题目：打印出如下图案（菱形）：
*
***
*****
*******
*****
***
*
程序分析：先把图形分成两部分来看待，前四行一个规律，后三行一个规律，利用双重for循环，第一层控制行，第二层控制列。
程序源代码：
#!/usr/bin/python
# -*- coding: UTF-8 -*-
from sys import stdout
for i in range(4):
for j in range(2 - i + 1):
stdout.write(' ')
for k in range(2 * i + 1):
stdout.write('*')
print
for i in range(3):
for j in range(i + 1):
stdout.write(' ')
for k in range(4 - 2 * i + 1):
stdout.write('*')
print
以上实例输出结果为：
*
***
*****
*******
*****
***
*
Python3 环境还可以使用以下方式实现：
#!/usr/bin/python3
for i in range(1, 5):
print(' ' * (4 - i), end="")
for j in range(1, 2 * i):
print('*', end="")
print()
for i in range(3, 0, -1):
print(' ' * (4 - i), end="")
for j in range(1, 2 * i):
print('*', end="")
print()
Python3 环境还可以使用以下方式实现：
#!/usr/bin/python3
def pic(lines):
middle, lines = int(lines / 2), int(lines / 2) * 2 + 1
for i in range(1, lines + 1):
empty = abs(i - middle - 1)
print(' ' * empty, '*' * (2 * (middle - empty) + 1))
line = 7 # 设置输出行数
pic(7)
Python3 环境还可以使用以下方式实现：
#!/usr/bin/python3
n = int(input('enter a number:'))
for i in range(1,n+1,2):
k = (n-i)//2
print( ' '* k , '*' * i)
for p in range(n-2,0,-2):
o = (n-p)//2
print(' '*o, '*'*p)
#!/usr/bin/env python
# -*- coding: utf-8 -*-
a = '*'
xx = []
for i in range(1, 5):
x = ''
for j in range(2*i-1):
x += a
xx.append(x)
print x.center(7, ' ')
if x == "*******":
xx.reverse()
for k in range(0, len(xx)):
print xx[k].center(7, ' ')
#usr/bin/env python3
#coding:utf-8
for i in range(4):
print((3-i)*' '+(2*i+1)*'*')
for i in range(3):
print((i+1)*' '+(5-2*i)*'*')
#!/usr/bin/python
# -*- coding: UTF-8 -*-
def funs(x):
i = 0
n = 1
k = x
while i<x:
print k * ' ', n*'*',k * ' '
i = i+1
n = n+2
k = k-1
n= n-2
k=1
while i*2>x-1:
k=k+1
i=i-1
n=n-2
print k * ' ', n * '*', k * ' '
funs(4)
Python3 环境还可以使用以下方式实现：
#!/usr/bin/python3
def printsome(n):
for index in range(abs(4 - n)):
print(" ", end="")
for index in range((4- abs(4 - n))*2 -1):
print("*", end="")
print()
for index in range(1, 8):
printsome(index)
可以设定行数：
#!/usr/bin/python
# -*- coding: UTF-8 -*-
n=int(raw_input("请输入行数："))
if n%2==0:
n1=n/2
n2=n1-1
for i in range(1,n1+1):
m=i*2
print ' '*n2,'*'*m
n2-=1
n2=1
for i in range(n1-1):
m-=2
print ' '*n2,'*'*m
n2+=1
else:
n1=n//2+1
n2=n1-1
for i in range(n1):
m=i*2+1
print ' '*n2,'*'*m
n2-=1
n2=1
for i in range(n1-1):
m-=2
print ' '*n2,'*'*m
n2+=1
#usr/bin/env python
#coding:utf-8
n = 4
for i in range(n):
a=' '*(n-1-i)+'*'*(i*2+1)
print(a)
for j in range(n-1):
a=' '*(1+j)+'*'*(2*n-j*2-3)
print(a)
#!/usr/bin/env python
# -*- coding: utf-8 -*-
n = int(input("请输入行数 n："))
for i in range(0,n):
a = abs(i - int(n/2))
b = n - abs(i - int(n/2))
print(" "*a+"*"*(b-a))
#!/usr/bin/python
# -*- coding: UTF-8 -*-
def print_diamond(n):
star = ['*']
for index in range(0,n):
print '{:^7}'.format(star[index])
star1 =star[index] + '**'
star.append(star1)
for i in range(n-2,-1,-1):
print '{:^7}'.format(star[i])
if __name__ == '__main__':
print_diamond(4)
for x in range(1,8)[::2]:print ("*"*x).center(10)
for x in range(1,6)[::-2]:print ('*'*x).center(10)
可以自由输入菱形的腰长，自定义大小，如果不输入值，直接回车即是默认的如题目示例那样的图形：
# encoding:utf-8
def paintlx(l):
for i in range(l / 2):
print ' ' * (l / 2 - i) + '*' * (i * 2 + 1)
print '*' * l
for i in range(l / 2 - 1, -1, -1):
print ' ' * (l / 2 - i) + '*' * (i * 2 + 1)
while True:
l = raw_input('请输入菱形腰长(奇数)，默认为7：')
if l == '':
l = 7
paintlx(int(l))
break
elif int(l) % 2 == 0:
print '说了是奇数！'
else:
paintlx(int(l))
break
参考实例，可用于 Python2.x 与 Python3.x：
# encoding:utf-8
for i,j in zip(range(3,-1,-1),range(1,9,2)):
print(" "*i+"*"*j)
for k,t in zip(range(1,4),range(5,0,-2)):
print(" "*k+"*"*t)
Python3 测试实例：
for i in range(4):
print(' '*(3-i),'*'*(2*i+1),' '*(3-i))
for i in list(range(3))[::-1]:
print(' '*(3-i),'*'*(2*i+1),' '*(3-i))
上述两个实例都是比较经典的也是比较有用的。寻找了各种各样的实例，大家参考下。如果感觉不错的话，请多多点赞支持哦。。。
原文链接：https://blog.csdn.net/luyaran/article/details/80063337
