今天分析 input 和 print 这俩方法的运行过程时产生一个疑问，如果我们要使用 print("msg") 输出内容，print 方法是先将 "msg" 和 "\n" 进行拼接后再调用 sys.stdout.print() 输出，还是分别输出 'msg" 和 "\n" ？
好家伙，我还特意去看了一遍源码，结论是分别输出。
分别输出。
"""
The following is from file: builtins.py
"""
# encoding: utf-8
# module builtins
# from (built-in)
# by generator 1.147
"""
Built-in functions, exceptions, and other objects.
Noteworthy: None is the `nil' object; Ellipsis represents `...' in slices.
"""
def print(self, *args, sep=' ', end='\n', file=None): # known special case of print
"""
print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False)
Prints the values to a stream, or to sys.stdout by default.
Optional keyword arguments:
file: a file-like object (stream); defaults to the current sys.stdout.
sep: string inserted between values, default a space.
end: string appended after the last value, default a newline.
flush: whether to forcibly flush the stream.
"""
pass
print('msg') = print('msg',end='\n')
其实就是end默认参数是换行符，你完全可以调整end达到输出格式要求