全称为Separate意为分开、隔开。
用于print两个元素时自定义间隔符(默认为两个空格)
关键字参数sep是实现分隔符，比如多个参数输出时想要输出中间的分隔字符。
print(1, 2, 3, sep = ',', end = 'rn')
print(1, 2, 3, sep = ' ', end = 'rn')结果输出如下：
1,2,3
1 2 3print("filen","abc","bcd","fffn","poi")
print("-------------")
print("filen","abc","bcd","fffn","poi",sep='')
print("-------------")
print("filen","abc","bcd","fffn","poi",sep=' ')
print("-------------")其结果为：
file
abc bcd fff
poi-------------file
abcbcdfff
poi-------------file
abc bcd fff
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