Python內建函式 50 print

英文文件：

print(*objects, sep=' ', end='\n', file=sys.stdout, flush=false

) print objects to the text stream file, separated by sep and followed by end. sep, end and file, if present, must be given as keyword arguments.

all non-keyword arguments are converted to strings likestr()does and written to the stream, separated by sep and followed by end. both sep and end must be strings; they can also benone, which means to use the default values. if no objects are given,print()will just write end.

the file argument must be an object with awrite(string)method; if it is not present ornone,sys.stdoutwill be used. since printed arguments are converted to text strings,print()cannot be used with binary mode file objects. for these, usefile.write(...)instead.

whether output is buffered is usually determined by file, but if the flush keyword argument is true, the stream is forcibly flushed.

說明：

1. 用於物件列印輸出。通過命名引數sep來確定多個輸出物件的分隔符(預設' ')，通過命名引數end確定輸出結果的結尾(預設'\n')，通過命名引數file確定往**輸出(預設sys.stdout)，通過命名引數fiush確定輸出是否使用快取(預設false)。

>>> print(1,2,3)1
23>>> print(1,2,3,sep = '+'
)1+2+3
>>> print(1,2,3,sep = '
+',end = '=?'
)1+2+3=?

2. sep、end、file、flush都必須以命名引數方式傳參，否則將被當做需要輸出的物件了。

>>> print(1,2,3,'
+','=?'
)123 + =?

3. sep和end引數必須是字串；或者為none，為none時意味著將使用其預設值。

>>> print(1,2,3,sep = 97,end = 100)
traceback (most recent call last):
file 
"", line 1, in
print(1,2,3,sep = 97,end = 100)
typeerror: sep must be none 
or a string, not
int>>> print(1,2,3,sep = none,end =none)
1 2 3

4. 不給print傳遞任何引數，將只輸出end引數的預設值。

>>> print
()>>> print(end = '
by 2016')
by 2016

5. file引數必須是乙個含有write(string)方法的物件。

>>> class
a:    @staticmethod    
defwrite(s):
print
(s)        
>>> a =a()
>>> print(1,2,3,sep = '
+',end = '
=?',file =a)1+
2+3=?

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