Python-Script to Export all Children of a Solution Tree

[FS]

I have a transient thermal model which solves at a number of times steps, the number may vary from simulation conditions. The results at each time step are stored in a solution folder.

For postprocessing I want to export the (in this case) temperature at each time step. I have created the following script. However it requires to enter the number of children manually. How can I determine the number of children, such as to remain the script untouched independent of the solution. BTW:

r1.Children 

does not work.

Script:

'''
Export all children in solution folder 'Temperature'
'''

import os

analysis=ExtAPI.DataModel.Project.Model.Analyses[0]
locationToExport = analysis.WorkingDir
# Enter number time steps
nsteps = 20
steps = list(range(2,nsteps+2))

for i in steps:
    resultsName = 'Temperature '+ str(i)
    fileName = resultsName + '.txt'
    fileToExport = os.path.join(locationToExport,fileName)
    r1=ExtAPI.DataModel.GetObjectsByName(resultsName)[0]
    r1.ExportToTextFile(fileToExport)