Python3 | print () function

First, the introduction of knowledge:

1, print () function, a printout;

2、语法：print(*objects,sep='',end='\n',file=sys.stdout,flish=flase)。

  parameter:

objects - complex, it represents a plurality of output objects. A plurality of output objects, need, separated.

sep - interval for a plurality of objects, the default is a space.

end - the end of what used to be set. The default is a newline \ n-, End = '' does not wrap.

file - the file object to write.

flush - whether the output is cached usually depends on the file, but if the flush key parameter to True, the flow will be forced to refresh.

 

Second, the use of presentation:

. 1 ,
 Print ( ' ! Hello World ' )
 # Output: hello world! 

2 ,
 Print ( ' Test01 ' ' test001 ' ' test0001 ' )    # outputs no need to partition the plurality of objects 
# Output: test01test001test0001
 
. 3 ,
 Print ( ' Test01 ' , ' test001 ' , ' test0001 ' )    # output a plurality of objects required, separated 
# output: test01 test001 test0001
 
4 ,
 Print( ' Test01 ' , ' test001 ' , ' test0001 ' , On Sep = ' sorted: ' )    
# Output: Test01 Sort: test001 Sort: test0001
 
. 5 ,
 Print ( ' . 1 ' , ' 2 ' , ' . 3 ' , On Sep = '\ n-')    # On Sep =' \ n-'branch 
# output: 
       1
       2
       . 3 

. 6 ,
 Print ( ' Python ' )
 Print ( ' IS Good ' )
 # outputs: Python 
         IS Good     
If: End = '  ' 
Print ( ' Python ' , End = '  ' )
 Print ( ' IS Good ' )
 # outputs: Python IS Good      # line
 
. 7 ,
 for I in Range (. 5 ):
     Print ( ' cycle of the output: ' , I)      # output newline is silent, i.e. end of the parameter \ n
# Output:
Loop output: 0
Output cycle: 1
Cyclic output: 2
Output cycle: 3
Cyclic output: 4 

If: End = '  ' 
for I in Range (. 5 ):
     Print ( ' No Wrap output: ' , I, End = '  ' ) 
# Output: not wrap Output: 0 not wrap Output: 1 does not wrap output: output does not wrap 2: 3 does not wrap output: 4

 . 8 ,
The default value of the parameter file sys.stdout, represents the system standard output. It can be made by varying the print parameters () function to a specific output file.
F = Open (R & lt " F.: \ named text.txt in " , " W " )          # open the file for writing 
   Print ( ' Test ' , File = F)             # output to a file 
   f.close ()                          # file is closed 
after the operation, text.txt can see the test output to a file. 

9 ,
flush parameter is used to control the output cache, primarily to refresh, the default False does not refresh, Ture refresh
f = open(r'a.txt', 'w')
print('python is good', file=f, flush=True)
Under normal circumstances print the content f the pre-existing memory, when the object is closed when the output file contents to a.txt, when flush = True it will immediately refresh the contents stored in the a.txt

 

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