For details about the line feed of the print function in Python 3, pythonprint

For details about the line feed of the print function in Python 3, pythonprint

Preface

Due to work needs, I recently looked at the Python application. Starting from the entry-level 9-9 multiplication table, I found that Python3.x and Python2.x are really quite different, just like the line feed processing here, i'm afraid I forget to write it down first. Well, I will not talk much about it. Let's take a look at the detailed introduction:

Code in Python2.X:

#! /Usr/bin/env python #-*-coding: UTF-8-*-_ author _ = '*****' class PrintTable (object ): '''print the 9 th multiplication table ''' def _ init _ (self): print ('start printing the 9X9 multiplication table ') self. print99 () def print99 (self): for I in xrange (1, 10): for j in xrange (1, I + 1 ): print ('% d X % d = % 2 s' % (j, I, I * j), print (' \ n ') if _ name _ = '_ main _': pt = PrintTable ()

For specific algorithms, the horizontal and vertical two-layer loops will not be mentioned.

Two problems are involved: first,print()Function end, in Pyhon2,print()To wrap a line after the output is printed, add a comma ',' to the end of the function. However, if you run the code in Python3, you will find that adding a comma does not work. Run 1 in win,

Figure 1

Run 2 in Linux,

Figure 2

We can see that there is no line feed, because in Python3, the line feed adopts a new syntax, suchprint(‘*‘, end=”)Yes, the difference is thatprint()The second parameter of the function, with end = "added, modifies, runs, and finally runs the result. 3,

Figure 3

Normal output.

In fact, there is still a problem in the above Code, connection problem 1,xrange()Function.print()Function syntax, not followedxrange()Then there will be 4 cases,

 
Figure 4

The following message indicates that 'xrange' is not defined. In Python3, The xrange () function has been integratedrange()Function, unified userange()Function.

OK. After modification, the normal result shown in Figure 3 is displayed.

Summary

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