Python update variable name in for loop

Shell Programming and Scripting
1

Hello all,
Not sure if this question has been answered already.

I have some xml Element variable as below:

child19 = core_elem_dcache.find('stat[@name="read_accesses"]')
    child20 = core_elem_dcache.find('stat[@name="write_accesses"]')
    child21 = core_elem_dcache.find('stat[@name="read_misses"]')
    child22 = core_elem_dcache.find('stat[@name="write_misses"]'

Next I want to change the values of these corresponding elements like below:

child20.set('value', str(params[19]))
child21.set('value', str(params[20]))
child22.set('value', str(params[21])) ######params is a list already read before from a text file

Now instead of setting setting the values manually for each element, I wanted to do a for loop for a range (10,100). But I am not sure how to update the "child" element dynamically.

I tried following:

for x in range(13,23):
        child{x}.set('value',str(params[x-1]))

which surely gave me error:

File "abc.py", line 99
    child{x}.set('value',str(params[x-1]))
         ^
SyntaxError: invalid syntax

Kindly help.

2

Check your python documentation for the 'exec' function. if you can't use child[index] and have to use hard names, exec is your friend for creating on the fly code (normally you would not do this though.. but there are some cases...).

3

Instead of using sequentially named variables, why not use a list (if you don't need to start with 19), or a dict?

child = {}
child[19] = 'value 19'
child[20] = 'value 20'

for x in range(19,20):
    child[x] = 'another value ' + str(x)