String formatting with %
operator#
Example of %
operator use:
In [2]: "interface FastEthernet0/%s" % '1'
Out[2]: 'interface FastEthernet0/1'
Old string format syntax uses these symbols:
%s
- string or any other object with a string type%d
- integer%f
- float
Output data columns of equal width of 15 characters with right side alignment:
In [3]: vlan, mac, intf = ['100', 'aabb.cc80.7000', 'Gi0/1']
In [4]: print("%15s %15s %15s" % (vlan, mac, intf))
100 aabb.cc80.7000 Gi0/1
Left side alignment:
In [6]: print("%-15s %-15s %-15s" % (vlan, mac, intf))
100 aabb.cc80.7000 Gi0/1
You can also use string formatting to influence the appearance of numbers.
For example, you can specify how many digits to show after comma:
In [8]: print("%.3f" % (10.0/3))
3.333
Note
String formatting still has many possibilities. Good examples and explanations of two string formatting options can be found here.