python之（11）实现四个组成不相同且无重复的三位数

题⽬：有四个数字：1、2、3、4，能组成多少个互不相同且⽆重复数字的三位数？各是多少？

for i in range(1,5): for j in range(1,5): for k in range(1,5):

if(i !=j) and (i !=k) and (j !=k): print(i,j,k)

实现结果：

C:\\Anaconda3\\python.exe \"C:\\Program Files\\JetBrains\\PyCharm 2019.1.1\\helpers\\pydev\\pydevconsole.py\" --mode=client --port=56955import sys; print('Python %s on %s' % (sys.version, sys.platform))

sys.path.extend(['C:\\\\app\\\\PycharmProjects', 'C:/app/PycharmProjects'])Python 3.7.6 (default, Jan 8 2020, 20:23:39) [MSC v.1916 64 bit (AMD64)]Type 'copyright', 'credits' or 'license' for more information

IPython 7.12.0 -- An enhanced Interactive Python. Type '?' for help.PyDev console: using IPython 7.12.0

Python 3.7.6 (default, Jan 8 2020, 20:23:39) [MSC v.1916 64 bit (AMD64)] on win32

runfile('C:/app/PycharmProjects/tensorflow/test.py', wdir='C:/app/PycharmProjects/tensorflow')1 2 31 2 41 3 21 3 41 4 21 4 32 1 32 1 42 3 12 3 42 4 12 4 33 1 23 1 43 2 13 2 43 4 13 4 24 1 24 1 34 2 14 2 34 3 14 3 2

拓展：有四个数字：1、2、3、4，能组成多少个互不相同且⽆重复数字的四位数？各是多少？

for i in range(1,5): for j in range(1,5): for k in range(1,5): for m in range(1,5):

if (i != k) and (i != j) and (i != m) and (j != k) and (j != m) and (k != m): print(i,j,k,m)

实现结果：

C:\\Anaconda3\\python.exe \"C:\\Program Files\\JetBrains\\PyCharm 2019.1.1\\helpers\\pydev\\pydevconsole.py\" --mode=client --port=57179import sys; print('Python %s on %s' % (sys.version, sys.platform))

sys.path.extend(['C:\\\\app\\\\PycharmProjects', 'C:/app/PycharmProjects'])Python 3.7.6 (default, Jan 8 2020, 20:23:39) [MSC v.1916 64 bit (AMD64)]Type 'copyright', 'credits' or 'license' for more information

IPython 7.12.0 -- An enhanced Interactive Python. Type '?' for help.PyDev console: using IPython 7.12.0

Python 3.7.6 (default, Jan 8 2020, 20:23:39) [MSC v.1916 64 bit (AMD64)] on win32

runfile('C:/app/PycharmProjects/tensorflow/test.py', wdir='C:/app/PycharmProjects/tensorflow')1 2 3 41 2 4 31 3 2 41 3 4 21 4 2 31 4 3 22 1 3 42 1 4 32 3 1 42 3 4 12 4 1 32 4 3 13 1 2 4

3 1 4 23 2 1 43 2 4 13 4 1 23 4 2 14 1 2 34 1 3 24 2 1 34 2 3 14 3 1 24 3 2 1