一行python能做什么!

主要收集了平常遇到的代码和网上的简单题目,然后尝试将代码压缩到一行,仅仅是娱乐一下~~~

−−−−−(1)−−−−−−

用一行python写出一个嵌套的字符串。

def plat(ch,n):return''if ~n else ' '*(n-1)+ ch+ch[::-1][1:]+'\n'+plat(ch+chr(ord(ch[-1])+1),n-1)

结果如图:

上面这个返回所需要的字符串,还可以这样写,连输出都省了：

def plat(ch,n): '' if ~n else (print(' '*(n-1)+ ch+ch[::-1][1:]),plat(ch+chr(ord(ch[-1])+1),n-1))

−−−−−−−(2)−−−−− :一行python解决n中取k问题:

def ck(a,r,k,now = 0,cur = 0): (now==k and print(r[:k])==None) or [ck(a,r[:now]+[a[i]]+r[now+1:],k,now+1,i+1) for i in range(cur,len(a)-k+now+1)]

−−−−(3)−−−−一行代码画出爱心曲线

利用心型曲线的公式

规定一个正方形,然后可以确定每一个位置是否该画出字符。

print ('\n'.join([''.join(['pybbyp'[(x-y)%6] if (x*0.04)**2+((y*0.1) - ((x*0.04)**2)**(1/3))**2 < 1 else ' ' for x in range(-30,30,1) ]) for y in range(15,-15,-1)]))

−−−[4]−−−构建一个树状字典−−

当我们不知道字典需要几层的时候,我们可以这样实现:

f = lambda:defaultdict(f)

这样tree = f()就可以实现任意层次的嵌套。

PS：思考

tree = defaultdict(tree) 为什么不对.

−−−[5]−−fizzbuzz问题

函数实现

def fizz(n=1):n== 101 or (print([n,'fizz','buzz','fizzbuzz'][(n%5 == 0)*2+(n%3 == 0)]),fizz(n+1))

循环实现:

for x in range(1, 101): print("fizz"[x % 3 * 4:]+"buzz"[x % 5 * 4:] or x)

−−−(6)−−−一行打印乘法表−−

#method 1
def f(n):[ ([print('{}*{}={}'.format(x,y,x*y),end = ' ')for x in range(1,y+1)])for y in range(1,n+1)]
#method 2
def f1(n,k=1): k==n+1 or (print(' '.join('{}*{}={}'.format(x,k,x*k) for x in range(1,k+1))),f1(n,k+1))

−−−(7)−−−一行实现一个迷宫

for i in range(10**3):print(random.choice('|| __'), end='')

−−−−−(8)画一个递归的三角图形−−−−−−−

这里我暂时没有压缩成功….有兴趣的可以试一试

def rec_plot(x,y,width,height,n):
    dx = width>>1
    dy = height>>1
    if n>1:
        rec_plot(x,y,dx,dy,n-1)     
        rec_plot(x-(dx>>1),y+dy,dx,dy,n-1)
        rec_plot(x+(dx>>1),y+dy,dx,dy,n-1)
    else:
        for _x,_y in zip(range(x,x-dx-1,-1),range(y,y+height+1,1)):
            points[(_x,_y)] = '*'
        for _x,_y in zip(range(x,x+dx+1),range(y,y+height+1,1)):
            points[(_x,_y)] = '*'
        for _x in range(x-dx,x+dx):
            points[(_x,y+height)] = '*'

rec_plot(40,0,32,16,3)
for y in range(0,80):
    for x in range(0,80):
        print(points[(x,y)],end='')
    print('')