八皇后解法（一）

import numpy as np
a=[4,1,2,5,4,0,6,7]

def rem(*args):
    str=[0, 1, 2, 3, 4, 5, 6, 7]
    for t in args:
        str.remove(t)
    return str

def isReturn(i):
    for t in range(i):
        if (abs( a[t] - a[i] ) == i-t):
            return True;
    return False
c=1
for a[0] in range(8):
    for a[1] in  rem(a[0]):
        if( isReturn(1)):
            continue
        for a[2] in rem(a[0],a[1]):
            if (isReturn( 2 )):
                continue
            for a[3] in rem(a[0],a[1],a[2]):
                if (isReturn( 3 )):
                    continue
                for a[4] in rem(a[0],a[1],a[2],a[3]):
                    if (isReturn(4)):
                        continue
                    for a[5] in rem(a[0],a[1],a[2],a[3],a[4]):
                        if (isReturn( 5 )):
                            continue
                        for a[6] in rem(a[0],a[1],a[2],a[3],a[4],a[5]):
                            if (isReturn( 6 )):
                                continue
                            for a[7] in rem(a[0],a[1],a[2],a[3],a[4],a[5],a[6]):
                                if (isReturn( 7 )):
                                    continue
                                
                                print(c,a)
                                c=c+1
    print("OK")

92個解,改進一下：

import numpy as np
a=[4,1,2,5,4,0,6,7]

def rem(*args):
    str=[0, 1, 2, 3, 4, 5, 6, 7]
    for t in args:
        str.remove(t)
    return str

def pc(i):
    str = [0, 1, 2, 3, 4, 5, 6, 7]
    for t in  range(i):
        str.remove(a[t])
    return str


def isReturn(i):
    for t in range(i):
        if (abs( a[t] - a[i] ) == i-t):
            return True;
    return False
c=1
for a[0] in range(8):
    for a[1] in  pc(1):
        if( isReturn(1)):
            continue
        for a[2] in pc(2):
            if (isReturn( 2 )):
                continue
            for a[3] in pc(3):
                if (isReturn( 3 )):
                    continue
                for a[4] in pc(4):
                    if (isReturn(4)):
                        continue
                    for a[5] in pc(5):
                        if (isReturn( 5 )):
                            continue
                        for a[6] in pc(6):
                            if (isReturn( 6 )):
                                continue
                            for a[7] in pc(7):
                                if (isReturn( 7 )):
                                    continue
                                print(c,a)
                                c = c + 1;
    print("OK")

繼續： 

import numpy as np
a=[4,1,2,5,4,0,6,7]

def rem(*args):
    str=[0, 1, 2, 3, 4, 5, 6, 7]
    for t in args:
        str.remove(t)
    return str

def pc(i):
    str = [0, 1, 2, 3, 4, 5, 6, 7]
    for t in  range(i):
        str.remove(a[t])
    return str

c=1
def isContinue(i):
    global c
    for a[i] in pc(i ):
        if (isReturn( i )):
            return True

    if (i == 6):
        if isContinue( i + 1 ):
            return True
    if(i==7):
        print(c,a)
        c=c+1

    return False

def isReturn(i):
    for t in range(i):
        if (abs( a[t] - a[i] ) == i-t):
            return True;
    return False

i=0
for a[i] in pc(i):
    i=i+1;
    for a[i] in  pc(i):
        if( isReturn(i)):
            continue
        i = i + 1;
        for a[i] in pc(i):
            if (isReturn( i )):
                continue
            i = i + 1;
            for a[i] in pc(i):  #3
                if (isReturn( i )):
                    continue
                i = i + 1;
                for a[i] in pc( i ):
                    if (isReturn(i)):
                        continue
                    i = i + 1;
                    for a[i] in pc( i ): #5
                        if (isReturn( i )):
                            continue
                        i = i + 1;
                        for a[i] in pc( i ):
                            if (isReturn( i )):
                                continue
                            i = i + 1;
                            for a[i] in pc( i ):
                                if (isReturn( i )):
                                    continue
                                print( c, a )
                                c = c + 1
                            i = i - 1
                        i = i - 1
                    i = i - 1
                i = i - 1
            i = i - 1
        i = i - 1
    i = i - 1

    print("OK")