Python 2.x下的print語句在輸出字符串之后會默認換行，如果不希望換行，只要在語句最后加一個“，”即可。但是在Python 3.x下，print()變成內置函數，加“，”的老方法就行不通了。
查詢Python的Library Reference>Built-in Functions，找到如下條目：
“print([object, ...], *, sep=' ', end='\n', 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='\n'均是print()的關鍵參數，sep的默認值為空，end默認值為換行符，這就是print()在輸出后默認換行的原因。相應的，解決辦法就是對end賦值：print(something, something,.., end='')，使end值為空，這個換行就消除了。
原文地址：http://wpp9977777.blog.163.com/blog/static/46251007201192905622402/