Get a value from a string in python
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**Program Details:**

I am writing a program for python that will need to look through a text file for the line: 

Found mode      1 of     12:  EV= 1.5185449E+04, f=   19.612545, T=    0.050988.

**Problem:**

Then after the program has found that line, it will then store the line into an array and get the value 19.612545, from f = 19.612545. 

**Question:**

I so far have been able to store the line into an array after I have found it. However I am having trouble as to what to use after I have stored the string to search through the string, and then extract the information from variable f. Does anyone have any suggestions or tips on how to possibly accomplish this?