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：
1 print("file\n","abc","fff",sep='#########\n',end='') 2 print("--------------------") 3 print("file\n","abc","fff",sep='#########\n',end='\n') 4 print("--------------------") 5 print("file\n","abc","fff",sep='#########\n') 6 print("--------------------")
其结果为：
file ######### abc######### fff-------------------- file ######### abc######### fff -------------------- file ######### abc######### fff --------------------
使用3,练习file的用法：
1 with open('abc.txt','w') as f: 2 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
