Replace string within file contents

with open("out.txt", "wt") as out:

    for line in open("Stud.txt"):

        out.write(line.replace('A', 'Orange'))

       

with open('Stud.txt','r') as f:

    newlines = []

    for line in f.readlines():

        newlines.append(line.replace('A', 'Orange'))

with open('Stud.txt', 'w') as f:

    for line in newlines:

        f.write(line)

       

text_file = open("file.txt", "rw")

whole_thing = text_file.read()

whole_thing = whole_thing.replace("A", "Orange");

text_file.write(whole_thing);

text_file.close();

       

file = open('Stud.txt')

contents = file.read()

replaced_contents = contents.replace('A', 'Orange')

 

<do stuff with the result>

       

import re

 

input = file('C:full_pathStud.txt), 'r')

#when you try and write to a file with write permissions, it clears the file and writes only #what you tell it to the file.  So we have to save the file first.

 

saved_input

for eachLine in input:

    saved_input.append(eachLine)

 

#now we change entries with 'A' to 'Orange'

for i in range(0, len(old):

    search = re.sub('A', 'Orange', saved_input[i])

    if search is not None:

        saved_input[i] = search

#now we open the file in write mode (clearing it) and writing saved_input back to it

input = file('C:full_pathStud.txt), 'w')

for each in saved_input:

    input.write(each)