iterating over a list and printing

[Peter Otten]

Bart Nessux wrote:

> ip_list = []
> inputFile = file('ips.txt', 'r')
> ip_list.append(inputFile.read())

You are reading the entire file in one big string and append it to the list
which will always have one big item.

> inputFile.close()
> for i in ip_list:
>     print "/sbin/ifconfig %s netmask 255.255.252.0 broadcast
> 128.173.123.255 up" %i
> 
> The last line does not work. It prints the first part (/sbin/ifconfig),
> then the entire list of ips, then the second part (netmask 255.255.252.0
> broadcast 128.173.123.255 up). Any ideas on how to fix this? The desired
> results are to print a line for each IP.
> 
> /sbin/ifconfig IP1 netmask 255.255.252.0 broadcast 128.173.123.255 up
> /sbin/ifconfig IP2 netmask 255.255.252.0 broadcast 128.173.123.255 up
> etc...

Assuming the file contains IPs one at a line, either initialize 

ip_list = inputFile.readlines()

or entirely omit the intermediate list:
(untested)

for line in file("ips.txt"):
    print "/sbin/ifconfig %s netmask 255.255.252.0 broadcast 128.173.123.255
up" % line.strip()

strip() removes any leading/trailing whitespace including the newline
character at the end.

Peter