Finding and Replacing string in a line

Question

I am trying to open a file and search for a particular string in a line and replace it with another string.

I am trying the following code.

def myFunct(file, test, patter, replace):
    with open(file, mode='r') as f:
        for line in f.readline():
            if str(line).__contains__(test):
                if patter in line:
                    print("Found here\n")
                    print(line)
    f.close()

The code does not seem to go into the for loop. Any suggestions ?

I have also tried a similar solution with the same problem.

Find and Replace

Answer 1

You are only reading the first line and iterate over the single characters of that line. You have to remove the readline :

def myFunct(file, test, patter, replace):
    with open(file, mode='r') as f:
        for line in f:
            if test in line and patter in line:
                print("Found here\n")
                print(line)