Python 2.x下的print语句在输出字符串之后会默认换行，如果不希望换行，只要在语句最后加一个“，”即可。但是在Python 3.x下，print()变成内置函数，加“，”的老方法就行不通了。
查询Python的Library Reference>Built-in Functions，找到如下条目：
“print([object, ...], *, sep=' ', end=' ', file=sys.stdout)
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Print object(s) to the stream file, separated by sep and followed by end. sep, endand file, if present, must be given as keyword arguments.
All non-keyword arguments are converted to strings like str() does and written to the stream, separated by sep and followed by end. Both sep and end must be strings; they can also be None, which means to use the default values. If no objectis given, print() will just write end.
The file argument must be an object with a write(string) method; if it is not present or None, sys.stdout will be used. ”
其中，sep=''和end=' '均是print()的关键参数，sep的默认值为空，end默认值为换行符，这就是print()在输出后默认换行的原因。相应的，解决办法就是对end赋值：print(something, something,.., end='')，使end值为空，这个换行就消除了。
原文地址：http://wpp9977777.blog.163.com/blog/static/46251007201192905622402/