Question

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?

Answer 1

Depending upon how you want to go at it, CosmicComputer is right to refer you to Regular Expressions. If your syntax is this simple, you could always do something like:

line = 'Found mode 1 of 12: EV= 1.5185449E+04, f= 19.612545, T= 0.050988.'

splitByComma=line.split(',')

fValue = splitByComma[1].replace('f= ', '').strip()
print(fValue)

Results in 19.612545 being printed (still a string though).

Split your line by commas, grab the 2nd chunk, and break out the f value. Error checking and conversions left up to you!