[Python] How do I find a string after finding a different string in a large text file?

I have a large text file and would like to use Python extract a line after matching a string in a preceding line. I can easily match the beginning string of a line with startswith(), but I want to find the first occurrence of a string after that position. Here is an example of the text in my file:

Test results
Description
Time 0.000
c-14 0.0000E+00


In other words, I can easily find the "Test results" string, but then I want to find the next or skip to the line that starts with "c-14" and read some numbers after it. I've tried a few things like re.findall() and next(), but I might have missed something. Thanks and let me know what you think.

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