String Search

import sys # so that I can use stdout

charList = [] # list to store all of the split up characters
searchChar = "n" # set what character we are searching for
index = 0 # counter for the loop
indexList = [] # list to store the indexes at which the program finds searchChar

charList = list(input("enter your string here!\n")) # get the string from the use
# then put each letter of the string in charList

while index < len(charList): # while the value of index is less than the number of indexes in charList
    try:
        if charList[index] == searchChar:
            print(searchChar, " found at index: ", index) # if seach char is found,
            # print the index at which it was found
            indexList.append(index) # append this index to indexList
        else:
            print(searchChar, " not found at index: ", index) # if search char is NOT found at index
    except TypeError:
        print("ERROR: index: ", index, " is not a string!") # this is for catching errors, should never trigger
    index = index + 1 # incriment the counter by 1

sys.stdout.write(("instances of " + searchChar + " were found at these indexes: "))
for i in indexList: # write all index at whcih searchChar were found
    sys.stdout.write((str(i) + ", "))
sys.stdout.write("\n") # newline
foo = input("press enter to exit") # pause