python - string.format，不同长度打破表

Question

我正在尝试将列表列表格式化为表格。它大部分都有效，但如果一个元素太长，它似乎会破坏表格。知道为什么会发生这种情况，或者如何使用此方法确保此处的表格格式良好？

 table_data = [['vlan1', '0013.F200.0058', '192.168.2.2'], 
                 ['vlan20', '0013.F200.0058', '192.168.30.2'],
                 ['vlan20', '0010.600a.7026', '192.168.30.4'],
                 ['vlan20', '70ca.9b99.6a82', '192.168.30.1'],
                 ['vlan21', '0013.F200.0058', '192.168.222.222'], 
                 ['vlan100', '0013.F200.0058', '192.168.110.2'],
                 ['vlan2100', '0013.F200.0058', '192.168.222.223']]



for i in table_data:
        interface,mac,ip = i
        print "Internet  {}\t {:>18s}\t{:>7s}\t  {:<8s}".format(ip, mac,'ARPA' ,interface)


Protocol  Address            Hardware Addr         Type   Interface                     
--------  -------            -------------         ----   ---------                     
Internet  192.168.2.2        0013.F200.0058        ARPA   vlan1                 
Internet  192.168.30.2       0013.F200.0058        ARPA   vlan20                
Internet  192.168.30.4       0010.600a.7026        ARPA   vlan20                
Internet  192.168.30.1       70ca.9b99.6a82        ARPA   vlan20                
Internet  192.168.222.222            0013.F200.0058        ARPA   vlan21        
Internet  192.168.110.2      0013.F200.0058        ARPA   vlan100               
Internet  192.168.222.223            0013.F200.0058        ARPA   vlan2100  

Answer 1

您可以使用左对齐格式，不是吗？请查看此文档 Format Specification Mini-Language

for i in table_data:
     interface,mac,ip = i
     print '{:<20s}{:<20s}{:<20s}{s}'.format(ip, mac,'ARPA' ,interface)