- 如何实现“1，2，3”变成[‘1’,‘2’,‘3’]? 如何实现[‘1’,‘2’,‘3’]变成[1,2,3]
a = "1,2,3"
b = a.split(",")
print(b)
print(",".join(b))
c = list()
for i in ['1', '2', '3']:
c.append(int(i))
print(c)
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1、2、3、4、5能组成多少个互不相同且无重复的三位数
for x in range(1, 6): for y in range(1, 6): for z in range(1, 6): if x != y and y != z and x != z: print("{}{}{}".format(x, y, z), end=" ")