Read in every line that starts with a certain character from a file

Question

I am trying to read in every line in a file that starts with an \'X:\'. I don\'t want to read the \'X:\' itself just the rest of the line that follows.

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Answer 1

Read every line in the file (for loop)
Select lines that contains X:
Slice the line with index 0: with starting char's/string as X: = ln[0:]
Print lines that begins with X:

for ln in input_file:
    if  ln.startswith('X:'):
        X_ln = ln[0:]
        print (X_ln)