Python3 print()函数sep,end,file参数用法练习

来自builtins.py：
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


使用1，练习sep的用法：

print("file\n","abc","bcd","fff\n","poi")
print("-------------")
print("file\n","abc","bcd","fff\n","poi",sep='')
print("-------------")
print("file\n","abc","bcd","fff\n","poi",sep=' ')
print("-------------")

其结果为：

file
 abc bcd fff
 poi
-------------
file
abcbcdfff
poi
-------------
file
 abc bcd fff
 poi
-------------

使用2，练习end的用法：

print("file\n","abc","fff",sep='#########\n',end='')
print("--------------------")
print("file\n","abc","fff",sep='#########\n',end='\n')
print("--------------------")
print("file\n","abc","fff",sep='#########\n')
print("--------------------")

其结果为：

file
#########
abc#########
fff--------------------
file
#########
abc#########
fff
--------------------
file
#########
abc#########
fff
--------------------

使用3,练习file的用法：

with open('abc.txt','w') as f:
    print("file\n","abc","fff",sep='#########\n',end='',file=f)

其结果：

将输出写到了文件abc.txt。

abc.txt的内容如下：

file
#########
abc#########
fff

 注意文件末行没有换行符